Belts

October 24, 2015

Welcome. The smooth sides of V-belts are what grips the pulley. The harder the pull, the more it grips, because of the V angle. The top and bottom do not touch anything. 

Table of Moped V-Belts

Moped Maker
Models or Types
Orig. no.
or Price
Width x Height
x Outer Length
Inch
Number
Metric
Number
Belt Manufacturer
Markings or Notes
Angel or Speed Bird
(non variator)
original
15.0 x10.0 x 907mm
0.51" x 0.39" x 35.7"
Sanwu (Taiwan)
895 3013
original
$15
15.0 x10.0 x 907mm
0.51" x 0.39" x 35.7"
Sanwu (Taiwan)
895 3013
Batavus VA, HS50, Starflite
(non variator M48 25,30mph)
original
480891
13.0 x 10.0 x 820mm
0.51" x 0.39" x 32.3"
Laura (Holland)
480891 A
substitute
$15
13.5 x 8.7 x 826mm
17/32" x 11/32" x 32.5"
17320
(32017)
13A0815 generic (automotive)
32017 13A0815
Batavus VA, HS50, Starflite
(non variator M48 20mph)
original
480893
Laura (Holland)
480893
substitute
N/A
Derbi Variant SL, SLE, TT
Var. Sport, DS50 (variator)
original
82 26 370
17.6 x 8.5 x 630mm
0.69" x 0.33" x 24.8"
Derbi (Spain)
Variant 82.26.37.0
original
$18
17.6 x 8.5 x 630mm
0.69" x 0.33" x 24.8"
Derbi (Spain)
Variant 82.26.37.0
Honda PA50 Hobbit/Camino
(variator)
original
23100...
15.0 x 9.0 x1085mm
0.59" x 0.35" x 42.7"
B type Mitsuboshi (Japan)
23100-148-7030
substitute
N/A
substitute
N/A
13.5 x 8.7 x1080mm
17/32" x 11/32" x 42.5"
12.7 x 7.9 x1067mm
1/2" x 5/16" x 42.0"
17420
(42017)
A40
AX40
13A1065 Gates (automotive)

Gates (industrial)
Honda NU50 Urban Express
(variator)
original
23100...
Mitsuboshi (Japan)
substitute
$18 (B31)
16.3 x10.3 x 864mm
21/32" x 13/32" x 34.0"
B31
BX31
Gates (industrial)
Motobecane 7, 40, 50, 50V
(variator and non-variator)
original
14756
14.0 x 9.0 x 830mm
0.55" x 0.35" x 32.7"
Optibelt (Germany)
172 115 MB 112 030
substitute
N/A (B31)
substitute
N/A
substitute
$20
16.3 x10.3 x 864mm
21/32" x 13/32" x 34.0"
13.5 x 8.7 x 826mm
17/32" x 11/32" x 32.5"
14.0 x 7.9 x 820mm
B31
BX31
17320
(32017)



13A0815

D24
Gates (industrial)

generic (automotive)
slips a little
Ventico (France)
Peugeot 103 models
(variator)
original
48815
13.0 x 8.5 x 870mm
0.51" x 0.33" x 34.3"
5497 Hutchinson 5497
Peugeot N°11 048815
substitute
$15
substitute
N/A
13.5 x 8.7 x 877mm
17/32" x 11/32" x 34.5"
12.7 x 7.9 x 864mm
1/2" x 5/16" x 34.0"
17340
(34017)
A32
AX32
13A0865 generic (automotive)
34017 13A0865
Gates (industrial)
Peugeot 103
(non variator)
original
48987
9.5 x 8.5 x 845mm
0.38" x 0.33" x 33.3"
5379 Hutchinson 5379
Peug. N°11 048 98700
substitute
$12
9.5 x 9.0 x 845mm
0.38" x 0.35" x 33.3"
D 255 Ventico (France)
D 255
Peugeot 101, 102
(non variator)
original
46068
9.5 x 8.0 x 735mm
0.38" x 0.31" x 28.9"
5378 Hutchinson 5378
Peug. N°11 046 06800
substitute
N/A
substitute
N/A
9.5 x 8.3 x 737mm
3/8" x 21/64" x 29.0"
9.5 x 8.0 x 740?mm
0.39" x 0.31" x 29.1?
3V290
3VX290


D 213
Gates (industrial)

Ventico (France)
D 213
Solo Odyssey
(non variator 1 or 2 sp)
original
00 57 176
10.0 x 6.0 x 730mm
0.39" x 0.24" x 28.7"
Optibelt (Germany)
Solo 00 57 176
original
$18
substitute
N/A
10.0 x 6.0 x 730mm
0.39" x 0.24" x 28.7"
9.5 x 8.3 x 725mm
3/8" x 21/64" x 28.5"


3V285
3VX285
Optibelt (Germany)
Solo 00 57 176
Gates (industrial)
Vespa Ciao C7N, C7E
(non variator)
original
102905
9.7 x 9.0 x 970mm
0.38" x 0.35" x 38.2"
Pirelli (Italy)
2931-102905/9
original rear pulley 94mm



smaller pulley 75-80mm

smaller pulley 65-70mm
substitute
$15
11.9 x 7.9 x 978mm
15/32" x 5/16" x 38.5"
9.5 x 9.0 x 960mm
0.38" x 0.35" x 37.8"
9.5 x 9.0 x 940mm
0.38" x 0.35" x 37.0"
9.5 x 9.0 x 925mm
0.38" x 0.35" x 36.4"
15380
(38015)
11A0965
11AV0965
10A0960C
10AV0960C
10A0940C
10AV0940C
10A0925C
10AV0925C
Gates (automotive)

Dayco (automotive)

Dayco (automotive)

Dayco (automotive)
Vespa Ciao C7V
(variator)
original
102906
13.0 x 7.0 x 975mm
0.51" x 0.28" x 38.3"
Pirelli (Italy)
2632-102906/9
substitute
N/A
12.7 x 7.9 x 965mm
1/2" x 5/16" x 38.0"
A36
AX36
Gates (industrial)
Vespa Bravo, Grande
(variator)
original
130937
13.0 x 7.0x1050mm
0.51" x 0.28" x 41.3"
Pirelli (Italy)
substitute
N/A
substitute
$15
substitute
$10
12.7 x 7.9x1041mm°
1/2" x 5/16" x 41.0"
12.7 x 7.9x1041mm
1/2" x 5/16" x 41.0"
11.9 x 7.9x1042mm
15/32" x 5/16" x 41.0"
2410
(4L410)
A39
AX39
15405
(40515)




11AV1030
Gates (industrial)

Gates (industrial)

generic (auto)
slips a little
Vespa Si, Boxer
(non variator)
original
124593
9.5 x 9.0? x 1143?mm
0.38" x ???? x ????
Pirelli (Italy)
substitute
N/A
9.5 x 1140/1150
0.38" x ???? x ????
Vespa Si, Boxer
(variator)
original
122192
13.0 x 7.0x1143?mm
0.51" x 0.28" x ????
Pirelli (Italy)
substitute
N/A
12.7 x 7.9x1092mm
1/2" x 5/16" x 43.0"
2430
(4L430)
Gates (industrial)
Vespa (unknown)
(non variator)
unknown
$15
9.7 x 8.5 x1050mm
0.38" x 0.33" x 41.4"
TD? 5332

 

V-Belts Explained

 

Moped V-BeltsFirst is a graphic showing the cross-sectional shapes and sizes of replacement V-belts that can be used on mopeds and small scooters. V-belts for variators (variable pulleys) are the “low profile” type, called “variable speed belts”. V-belts for fixed pulleys are the “high profile” type, called either “classic” or “cogged”, see below.  

V-belts are made by Gates in different styles, widths, and lengths. Here the width choices from 9.5 to 17.5 mm. Larger or smaller sizes are omitted. 

9.5 mm  3L, 3V, 3VX
10.0 mm 10X, SPZ, XPZ
11.9 mm automotive 15
12.7 mm 4L, A, AX
13.0 mm 13X, SPA, XPA
13.5 mm automotive 17
15.9 mm 5V, 5VX
16.0 mm SPB, XPB
16.7 mm 5L, B, BX

17.0 mm 17X
17.5 mm automotive 22

 

Smooth or Notched: The notches, or cogs, on V-belts are not teeth, like on toothed belts. They are relief slots that help the belt bend easier, for less friction and more efficiency. Equipment that originally had smooth belts can use cogged belts, and visa versa.

   

 

Laura M48 engine versions

 

Batavus/Laura M48 20mph v-belt: So far there is only a part number and a photo, but no width, length or belt number available. It’s size can only be estimated from this photo. If anyone knows, please tell Shaun by email.

 

More about V-belts:

http://www.smex.net.au/reference/Vbelts02.php

 

Batavus/Trac/Laura M56 toothed belt: The only mopeds with a toothed drive belt are the 1978-80 Batavus Regency, wit Laura M56 engine,  … continued later …


Sprockets

July 14, 2014

Coming up: How to tell the chain pitch by measuring the sprocket. Hint: the diameter at the tooth tops is not important.

Chain Pitch equals Pitch Diameter times Pi divided by the number of teeth.

Measuring the Pitch Diameter is difficult, especially with odd numbered and low numbered tooth counts.

Locating two pin centers, 180 degrees apart, and measuring the distance between, is the problem.

You have to know the roller diameter to locate the pin center. Something like a chopstick is needed…

Under construction …

 


Chains

July 14, 2014

All European mopeds, and Asian mopeds with European engines, have 1/2″ x 3/16″ chains.

In modern chain numbers, they have 415 or 415H type motor chains. Most mopeds use a 415H with taller and wider plates. Some (with a lip close to the sprocket teeth) must have a 415 with shorter and thinner plates. 

How to install and remove master links.

How to install and remove master links.

To order a regular replacement chain for your moped, count the links (L) in your old chain. Tomos is around 90L -94L, Puch is around 100L, others are 102L to 106L . It’s always an even number because roller chain links come in pairs, inner and outer. Some chains have a “half link” that’s half inner and half outer. Then the link count will be an odd number.

Myrons Mopeds will cut the new chain to have the number (must be even) of links that you say, for no extra charge. If your chain is a 415H, and you need an odd number of links, a 415H half link is available for $3 extra.

 

 

RK415H 110L chain

A. RK 415H 110L modern chain from Malaysia
3.93 x 8.0

Iris 415 104L vintage chain

B. Iris 1/2 x 3/16 102L vintage chain, Spain
3.89 x 8.0

ČZ chain

C. ČZ 1/2 x 3/16 96L vintage, Czech Republic
4.14 x 9.6

Iris Copper chain

D. Iris Copper 1/2 x 3/16 106L vintage, Spain
3.89 x 8.0

 

 

 

 

 

 

Regina 415 vintage chain

E. Regina “415” 90L vintage chain from Italy
3.89 x 8.4

Regina 415

E. The only vintage chain that says 415. Wow!

Union chain made in Germany

F. Union/Styria 100L vintage chain, Germany
4.05 x 9.0

Regina

G. Regina (thick) 95L
4.05 x 9.0  Italy

 

 

 

 

 

 

Regina Extra

H. Regina Extra 77L
click to enlarge
4.05 x 7.9

Chains Oct 2012

I. #24 is same as #D (coated with white grease)

W circled logo

J. “W-circled” chain
92L, 98L, 100L
4.05 x 7.7

 

 

 

 

Part # #              chain#   pin x width       links Price      Applications
######## ## #################################### ### #########################
         C H A I N S    f o r   s a l e
TYC-96      chain    TYC 42    415   3.58 x 7.0 black 96L $20 some mopeds and motor kits
TYC-100      chain    TYC 42    415   3.58 x 7.0 black 100L $22 some mopeds and motor kits
41-90      chain    MAX 41    41    3.58 x 8.9 black 90L $20 industrial (and mopeds)
41-98      chain    MAX 41    41    3.58 x 8.9 black 98L $20 industrial (and mopeds)
41-240      chain    MAX 41    41    3.58 x 8.9 black 240L $45 industrial
207012 21      chain     plain    415H   3.93 x 8.0 black 90L $18 European mopeds
16092 22      chain      KMC    415H   3.93 x 8.0 black 98L $15 European mopeds
16096 23      chain      KMC    415H   3.93 x 8.0 chrome 98L $20 European mopeds
16096+      chain      KMC    415H   3.93 x 8.0 chrome110L $30 European mopeds
340360 A      chain        RK     415H   3.93 x 8.0 black 110L $20 <<<<   very good chain!
491200      chain      CIC     415H   3.93 x 8.0 black 122L $25 European mopeds
420-120L      chain     plain     420    3.93 x 9.4 black 120L $25 Asian mopeds
RK420 25      chain        RK      420    3.93 x 9.4 black 84L $18 Asian mopeds
Tsu420      chain   Tsubaki   420    3.93 x 9.4 black 108L $25 Asian mopeds
RK428H      chain        RK    428H  4.45 x 12.0 black 120L $30 small motorcycles
Iris B vintage chain    Iris   415   3.89 x 8.0 black 102L $50 Derbi 1970’s original NOS
Iris race D vintage chain    Iris   415   3.89 x 8.0 copper 106L $75 Derbi 1980’s racing chain NOS
Regina E vintage chain Regina 415  3.89 x 8.4 black 90L $35 Tomos 1970’s original NOS
Sedis vintage chain  Sedis  415  3.93 x 7.5 black 88L $40 Peugeot 1970’s original NOS
Wcirc92 J vintage chain W-circ  415  4.05 x 7.7 black 92L $35
Wcirc98 J vintage chain W-circ 415   4.05 x 7.7 black 98L $40
Wcirc100 J vintage chain W-circ 415   4.05 x 7.7 black 100L $40 Flying Dutchman, others
RegExtra H vintage Regina Extra 415  4.05 x 7.9 black 77L $25 Italian 1970’s (has half link)
RegHD G vintage chain Regina 415  4.05 x 9.0 black 95L $35 Italian 1970’s (has half link)
Union F vintage chain Union  415  4.05 x 9.0 black 100L $80 Puch 1970’s original NOS
ČZ C vintage chain    ČZ    415   4.14 x 9.2 nickel 96L $45 Tomos 1990’s original NOS

 

 

 

 

Master Links

###### ### ################################ #### ###########################
     M A S T E R    L I N K S    f o r   s a l e : In order by pitch, pin size, width
                                      inner Cabinet rows 1 to 6, columns a to e
                 pitch    pin    width  model #
###### ###     3.57 Pins – light pink drawers #### ###########################
35 link  1b master link 9.53 x 3.57 x 7.7 ANSI 35 $3 #35 3/8 pitch chain
35 half  1c half link      9.53 x 3.57 x 7.7 ANSI 35 $3 #35 3/8 pitch chain
410 link  2b master link 12.7 x 3.57 x 5.8 410 (ASA 43) $2 #410 bicycle 1-speed
410noclip  2a master link 12.7 x 3.57 x 5.8 410 clipless $1 flex chain to unlock
42 link  2d master link 12.7 x 3.57 x 7.2 ASA 42 $6 Peugeot 102 original
42H half  2e half link      12.7 x 3.57 x 7.6 ASA 42H $3 holes too small for 415
41 link  3a master link 12.7 x 3.57 x 9.2 ANSI 41 $3 widest chain with 3.57 pins
###### ###     3.87 Pins – white drawer #### ###########################
415 iris  3b master link 12.7 x 3.87 x 8.3 415 Iris $7 Motobecane, Derbi original
###### ###     3.93 Pins – light yellow drawers #### ###########################
415 link  3d master link 12.7 x 3.93 x 7.9 415 Sedis $5 Peugeot 103 original
415H link  3e master link 12.7 x 3.93 x 8.5 415H $3 2004-later Tomos original
415H chr  3e master link 12.7 x 3.93 x 8.5 415H chrome n/a fits 1990-later 415H chains
415H half  3e half link      12.7 x 3.93 x 8.5 415H $3 fits 1990-later 415H chains
415 reg1  4a master link 12.7 x 3.96 x 8.8-9.2 415 Reg. $8 h. duty Italian “Regina Extra”
420 link  4b master link 12.7 x 3.93 x 9.8 420 $3 wider than 415 or 415H
420 half  4b half link      12.7 x 3.93 x 9.8 420 $5 thinner than 420H or 40
40 link  4d master link 12.7 x 3.93 x 11.1 ANSI 40 $5 40 master link also fits 420H
###### ###     4.05 Pins – lt. green – master plate “17” #### ###########################
415 tom1  4e master link 12.7 x 4.05 x 7.9 415 W circled $5 1970’s -80’s Tomos original
415 reg2  5a master link 12.7 x 4.05 x 8.2-8.6 415 Reg. $5 Italian original “Regina Extra”
415 plain  5b master link 12.7 x 4.05 x 8.7-9.0 415 plain $5 original chain
415 puch  5c master link 12.7 x 4.05 x 9.2-9.4 415 Union $8 Puch original, Regina Extra HD
###### ###     4.14 Pins – light blue – master plate “18” #### ###########################
415 “H”  5d master link 12.7 x 4.14 x 8.4 415 plain $2 late 1980’s standard? Not 415H
415 “H”  5e master link 12.7 x 4.14 x 8.4 415 (bag of 10) $10 late 1980’s standard? Not 415H
415 tom2  6a master link 12.7 x 4.14 x 9.4 415 W circled $6 late 1980’s Tomos original
415 CZ  6a master link 12.7 x 4.14 x 9.6 415 “ČZ” N/A late 1990’s-early 2000’s Tomos
###### ###     4.43 Pins – dark blue drawers #### ###########################
Jawa link  6c master link 12.7 x 4.42 x 9.2 Jawa $4 Jawa – thicker pin & roller
428 link  6d master link 12.7 x 4.43 x 11.4 428 $5 small motorcycles

 

Master Links Cabinet

At left is Myrons Mopeds master link cabinet, full of master links and half links from 20 other moped shops that closed in the late 1980’s in Southern California. Each of the drawers contains about 10 to 100 links. Each link was measured carefully and/or put through this gauntlet of Go/NoGo gauges, which are the actual master links and corresponding inner links contained in each drawer. From left to right, the order is smallest pitch first, smallest pin first (for that pitch), and the smallest inner width first (for that pitch and pin). Inner width for a master link is the space between the inside of the outer plates, which is slightly greater than the inner width for the chain, as in the chart below.

Notice that there are no “international” master links, like 04B (6mm) or 05B (8mm). These chains did not appear in California until the late 1990’s with the stand-up scooters, pocket bikes, and electric bikes and scooters, mostly from China.

 

 

C H A I N S   E X P L A I N E D

 

Chains

Chains for mopeds, motorized bicycles, gas or electric scooters, and minibikes are not on most application charts. For these oddball vehicles you have to measure and determine which chain size it takes, and how many links. Some Chinese made scooters and pocket bikes have 6.00mm pitch (not 6.35 = 1/4″) or 8.00mm pitch (not 9.53 = 3/8″). They look the same but don’t mesh on American sprockets. Another main source of confusion is pin diameter. Often several different chains interchange (fit the same sprocket), but have different pin diameters, pin lengths, and plate thicknesses. So while the entire chain interchanges, the individual links do not. A master link from one 415 chain often does not fit another 415 chain. Wow.

 

How to use the Myrons Complete Chain Size Chart : 

The dimensions of “every” roller chain, that might be used on motorcycles, scooters or bicycles, are listed below. The first three dimensions, pitch P (distance between pin centers), width W (distance between inside of inner plates), and the roller diameter D, are what matter for it to fit the sprocket. A wider chain (larger W) will work but not as good. European moped chains are #415 compatible. Asian moped chains are #420. Single speed bicycle chains are #410. Electric and small gas scooters are #25 (American) or #04B (International). Gas scooters and pocket bikes are #35 (American) or #06B (International). American made mini bikes are #35 or #41. American power equipment and industrial chains are #25, #35, #41, #40, #50, #60, and up. Modern motorcycle chains are #420, #428, #520, #525, #530, and #630. Small engine timing (cam) chains are #25 (American), or #04B (International).

Chain DimensionsScan up and down the chart looking for similarities. Notice how the pitch P, and roller width W, and roller diameter D, can be the same for many different chains. Too bad the pin diameter A can vary with the maker. Ouch. A pin too big won’t fit. A pin too small will fit, but will be loose. The only way to get the correct master link is by knowing the pitch P, roller width W, roller diameter D,  inner width W+2*T, and pin diameter A.

######### ##### ################################### ####### #########################
Wire Gauges    MYRONS COMPLETE CHAIN SIZE CHART made from many charts combined
BS10=3.25mm                 by Shaun Strahm  Feb 2013
US10=3.57 Chain  ANSI     ISO std      JIS std      BS
BS 9= 3.66   ISO=  International Organization of Standardization ####### #########################
US 9= 3.97   ANSI  American National Standards Institute bush B29.1   ISO 1395   JIS B1801
BS 8= 4.06   ASA  American Standard Association (old name) roller B29.1   ISO 606     JIS B1801
US 8= 4.37   BS =  British Standard or “Metric Chain” heavy use B29.1   ISO 3512
BS 7= 4.47   JIS =  Japanese Industrial Standards bicycle          ISO 9633   JIS D9417   BS 228
US 7= 4.76   JCAS  Japan Chain Association Standards motorcycle          ISO 10190  JCAS 1     BS 6715
BS 6= 4.88   DIN=  Deutsches Institut für Normung ####### #########################
US 6= 5.16  ISO 606 (DIN 8187) is European
 ANSI B29.1 (DIN 8188) = American
######## #### ################################ ####### #########################
           (dimensions in millimeters)       calcd master link
 Chain  A#   chain   roller   roller   pin   plate  inner  outer max     min         quotes = directly measured
  Size  or    pitch   width   diam  diam  thick  width  width pin    inner         ? = estimate or guess
 P x W ISO#  JIS#     P        W        D        A       T    W+2T     R dia  width Std   Source      Application/Notes
######## #### ################################ ####### #########################
CHAIN SIZE   #    pitch   width   roller   pin   plate  inner  outer master link     S M A L L E R      C H A I N S :
3/16x 3/32 03C 15      4.76   2.38   4.00   1.85   0.60   3.78   6.80 ISO   hzpt.com       industrial
M5 x 2.5 03B           5.00   2.50   3.20   1.49   0.60   3.70   7.40 BS/DIN beijingthc.com
M6 x 2.8 04B           6.00   2.80   4.00   1.85   0.60   4.00   7.40 BS/DIN beijingthc.com
M6 x 2.8 04B           6.00   2.80   4.00   1.85   0.60   4.00   6.80 BS    hzpt.com       industrial
M6 x 2.8 04B           6.00   2.80   4.00   1.83   0.61   4.02   6.30 BS    Allied-Locke   industrial
1/4 x 1/8 04C 25      6.35   3.18   3.30   2.30   0.75   4.68   7.60 ANSI hzpt.com   (bush, not roller)
1/4 x 1/8 04C 25      6.35   3.18   3.30   2.29   0.76   4.70   7.92 ANSI Diamond   (bush, not roller)
1/4 x 1/8 04C 25      6.35   3.18   3.30   2.28   0.76   4.74   8.64 ANSI docstoc.com  (bush, not roller)
1/4 x 1/8 04C 25      6.35   3.18   3.30   2.30   0.75   4.68   8.60 ANSI chainsprocketpulley.com
1/4 x 1/8 04C 25      6.35   3.28   3.25   2.27   0.80   4.60   7.95 ANSI “25” direct measure
1/4 x 1/8 04MA 25H    6.35   3.18   3.30   2.30   1.00   5.18   8.90 ANSI mdmetric.com (bush)
1/4 x 1/8 04MA 25H    6.35   3.18   3.30   2.30   1.00   5.18   9.00 ANSI hzpt.com   (bush, not roller)
1/4 x 1/8 04MA 25H    6.35   3.22   3.25   1.99   1.00   5.22   8.95 ANSI “DID 25SH”
1/4 x 1/8 04MA 25H    6.35   3.28   3.25   2.0?   1.00   5.18   8.95 ANSI “25H” (PC50 cam chain 42L)
M7.8 x 4.7 05MA 219    7.77   4.68   4.59   3.00   1.20   7.08   11.5 JCAS mdmetric.com (bush)
M8 x 3.0 05B           8.00   3.00   5.00   2.31   0.80   4.60   8.20 BS    hzpt.com       industrial
M8 x 3.0 05B           8.00   3.00   5.00   2.31   0.75   4.50   8.2? BS/DIN beijingthc.com
M8 x 3.0 05B           8.00   3.2      5.00   2.3     0.75   4.7   8.2? BS/DIN ocm.co.jp  industrial
M8 x 4.7 05T           8.00   4.70   4.73   3.05   1.25   7.20   11.0 ISO   hzpt.com       industrial
M8.5 x 4.8 05MC 270H  8.50   4.75   5.00   3.28   1.80   8.35   13.3 JCAS mdmetrics.com (bush)
3/8 x 5/32 old     9.53   4.00   6.28   3.23   1.25   6.50   10.9      “W” circled    (roller) Tomos A3
3/8 x 5/32 old     9.53   4.05   6.35   3.2?   1.30   6.65   10.6   “Regina Extra” (roller) Tomos A3
3/8 x 3/16 06C 35      9.53   4.76   5.08   3.58   1.27   7.30   11.8 3.57×7.7 ANSI Diamond       (bush, not roller)
3/8 x 3/16 06C 35      9.53   4.76   5.06   3.56   1.30   7.36   11.7 3.57×7.7 ANSI “ANSI 35”  (bush, not roller)
3/8 x 3/16 06C 35      9.53   4.76   5.08   3.58   1.27   7.30   12.7 3.57×7.7 ANSI docstoc.com  (bush, not roller)
3/8 x 3/16 06C 35      9.53   4.85   5.10   3.6?   1.35   7.55   11.9 3.57×7.7 ANSI “Regina ASA 35” (bush)
3/8 x 3/16 06C 35      9.53   4.99   4.99   3.6?   1.10   7.19   11.7 3.57×7.7 ANSI “KMC 35” (bush) Tomos A35/55
3/8 x 7/32 06B           9.53   5.72   6.35   3.28   1.32   8.36   13.4 BS/DIN ocm.co.jp  industrial
3/8 x 7/32 06B           9.53   5.72   6.35   3.28   1.30   8.32   13.2 BS    hzpt.com        industrial
3/8 x 7/32 06B           9.53   5.72   6.35   3.28   1.27   8.26   12.5 BS/DIN beijingthc.com
3/8 x 7/32 06BH           9.53   5.72   6.35   3.28   1.50   8.72   14.0 ISO   hzpt.com     industrial
3/8 x 1/4           9.53   6.35                obsolete ?
3/8 x 5/16           9.53   7.94   5.03            (bush, not roller)
3/8 x 3/8 06MA T3F    9.53   9.50   6.00   4.50   1.80   13.1   18.6        (China only) (bush)
######## #### ################################ ####### #########################
CHAIN SIZE   #    pitch   width   roller   pin   plate  inner  outer master link     B I C Y C L E   C H A I N S :
1/2×11/128           12.7   2.2?   7.75   3.6?   0.7?   3.6?   5.5 special ISO   wikipedia      bicycle 11sp Camp
1/2×11/128           12.7   2.2?   7.75   3.6?   0.8?   3.8?   5.9 special ISO   wikipedia      bicycle 10sp Camp
1/2×11/128           12.7   2.2?   7.75   3.6?   0.8?   3.8?   6.2 special ISO   KMC X10       bicycle 10 speed
1/2×11/128           12.7   2.2?   7.75   3.6?   0.9?   4.0?   6.6 special ISO   KMC Z9000   bicycle 9 speed
1/2 x 3/32           12.7   2.4?   7.75   3.58   0.9?   4.2?   7.1 special ISO   KMC Z72       bicycle 7-8 spd
1/2 x 3/32           12.7   2.4?   7.75   3.58   1.0?   4.4?   7.3 special ISO   KMC Z50       bicycle 6-7 spd
1/2 x 3/32           12.7   2.5?   7.75   3.58   1.0?   4.5?   7.8 none ISO   KMC Z30       bicycle 5-6 spd
1/2 x 3/32 082           12.7   2.40   7.75   3.63   1.0?   4.4?   8.1 none BS/DIN THC 47 beijingthc.com
1/2 x 3/32           12.7   2.45   7.70   3.57   1.00   4.45   7.5 none ISO   “Sedisport”    bicycle 5-6 spd
1/2 x 3/32           12.7   2.55   7.71   3.58   1.00   4.55   7.9 none ISO   “W.S.  7-6”   bicycle 5-6 spd
1/2 x 1/8 081         12.7   3.30   7.75   3.66   1.10   5.50   10.2 3.57×5.8 BS/DIN hangzhou bicycle 1-spd
1/2 x 1/8 43      12.7   3.40   7.75   3.63   1.02   5.40   9.4 3.57×5.8 ANSI THC 42 beijingthc.com
1/2 x 1/8 410    12.7   3.45   7.71   3.57   1.00   5.45   8.8 3.57×5.8 ISO  “TAVA  Taiwan” bicycle 1sp
1/2 x 1/8 old     12.7   3.46   7.74   3.57   0.95   5.36   9.2 3.57×5.8 ISO  “U” Union-Styria  bicycle
1/2 x 1/8 410    12.7   3.50   7.68   3.59   1.00   5.50   8.8 3.57×5.8 ISO  “KMC   Z”     bicycle 1-spd
######## #### ################################ ####### #########################
CHAIN SIZE   #    pitch   width   roller   pin   plate  inner  outer master link     M O P E D   C H A I N S :
1/2 x 3/16 42      12.7   4.80   7.77   3.63   1.02   6.84   10.8 3.57×7.2 ANSI OCM chain S Series
1/2 x 3/16 42      12.7   4.95   7.75   3.58   1.02   6.95  10.6 3.57×7.2 BS   “TYC 82D”    freight bicycle
1/2 x 3/16 42      12.7   5.00   7.74   3.57   1.02   7.00   11.1 3.57×7.2 old  “Sedis France” Peugeot 102
1/2 x 3/16 42H   12.7   5.00   7.72   3.58   1.27   7.54   12.? 3.57×8.0 ANSI “42 USA”
1/2 x 3/16 old     12.7   5.02   7.72   3.87   2.00   9.02   14.5       “Regina Extra”  h. duty Italian
1/2 x 3/16 old     12.7   5.04   7.68   3.88   1.50   8.04   13.2 3.87×8.2       “IRIS”     Derbi, Motobecane
1/2 x 3/16 415     12.7   5.02   7.72   3.89   1.70   8.42   13.8        “Regina 415” Tomos A3
1/2 x 3/16 415    12.7   5.04   7.75   3.92   1.25   7.54   11.7 3.92×7.9         “Sedis France” Peu 103, Batavus
1/2 x 3/16 415    12.7   5.03   7.71   3.95   1.25   7.53   11.8 3.92×7.9         “unmarked”  round rivets
1/2 x 3/16 415    12.7   5.05   7.73   3.96   1.25   7.55   12.2 3.92×7.9         “Sedis France” round rivets
1/2 x 3/16 415    12.7   4.88   7.75   3.96   1.30   7.48   12.5 3.92×7.9 ISO   ZHC chain     moped
1/2 x 3/16 415H  12.7   4.99   7.69   3.92   1.50   7.99   13.1 3.92×8.5 JCAS “KMC K415H”  bmx freestyle
1/2 x 3/16 415H  12.7   5.00   7.67   3.93   1.50   8.00   13.1 3.92×8.5 JCAS “C I C” Tomos A35 mid 00’s
1/2 x 3/16 415H  12.7   4.92   7.71   3.93   1.50   7.92   13.2 3.92×8.5 JCAS “RK 415H”  moped/freestyle
1/2 x 3/16 415H  12.7   4.95   7.68   3.93   1.50   7.95   13.3 3.92×8.5 JCAS “415H”  brownish color
1/2 x 3/16 415H  12.7   4.88   7.75   3.96   1.50   7.88   12.8 3.92×8.5 JCAS ZHC chain    moped
1/2 x 3/16 old     12.7   5.00   7.73   4.05   1.30   7.60   12.2 4.05×8.2        “W” circled Tomos A3 original
1/2 x 3/16 old     12.7   5.05   7.73   4.04   1.40   7.85   12.9 4.05×8.2        “Regina Extra”  Italian mopeds
1/2 x 3/16 old     12.7   5.33   7.69   4.07   1.82   8.97   14.7 4.05×9.2        “Regina (underlined)” Italian
1/2 x 3/16 084         12.7   4.88   7.75   4.09   1.80   8.48   14.8 4.05×9.2 BS    hangzhou      industrial
1/2 x 3/16 old     12.7   5.00  7.75   4.05   2.00   9.00   14.3 4.05×9.2        “Styria” Union Puch original
1/2 x 3/16 old     12.7   4.92   7.72   4.14   1.43   7.78   12.1 4.13×8.3        “unmarked”   industrial
1/2 x 3/16 old     12.7   5.11   7.72   4.14   1.90   8.91   14.5 4.13 x 9.4        “Regina (underlined)” Italian
1/2 x 3/16 old     12.7   5.35   7.68   4.14   1.90   9.15   14.5 4.14×9.6        “ČZ” silver  Tomos A35 late 90’s
1/2 x 3/16 old     12.7   4.88   7.75   4.18   1.50   7.88   12.8 4.14×8.3        chainsprocketpulley.com
1/2 x 3/16 old     12.7   5.0?   8.4?   4.43   1.4?   7.8?   14.? 4.43×9.2        “unmarked” unknown
1/2 x 3/16    086 Jawa  12.7   5.0?   8.43   4.43   1.82   8.6?   14.? 4.43×9.2        “unmarked” Jawa original
1/2 x 1/4 085 41      12.7   6.25   7.75   3.58   1.25   8.85   13.7 3.57×9.2 BS    hzpt.com     light duty
1/2 x 1/4 41      12.7   6.45   7.70   3.57   1.25   8.85   13.3 3.57×9.2 ANSI “MAX 41”   light duty
1/2 x 1/4 41      12.7   6.35   7.75   3.58   1.27   8.89   13.0 3.57×9.2 ANSI Diamond     light duty
1/2 x 1/4 08MA 420    12.7   6.35   7.75   3.96   1.50   9.35   14.5 3.92×9.7 ISO   ZHC chain   motorcycle
1/2 x 1/4 08MA 420    12.7   6.35   7.72   3.95   1.50   9.35   14.8 3.92×9.7 JCAS “EK 420”     Asian mopeds
1/2 x 1/4 08MA 420    12.7   6.35   7.74   3.93   1.50   9.35   14.7 3.92×9.7 JCAS “DID 420”   Asian mopeds
1/2 x 1/4 08MA 420H  12.7   6.35   7.75   3.96   1.80   10.0   15.7 3.92×11.0 ISO   ZHC chain   motorcycle
1/2 x 1/4 420H  12.7   6.35   7.70   3.96   2.00   10.4   17.3 3.92×11.0 JCAS EK chain      motorcycle
######## #### ################################ ####### #########################
CHAIN SIZE   #    pitch   width   roller   pin   plate  inner  outer master link     L A R G E R      C H A I N S :
1/2 x 5/16 08A           12.7   7.85   7.95   3.96   1.50   10.9   16.6 BS    hzpt.com      industrial
1/2 x 5/16 40      12.7   7.94   7.94   3.96   1.52   11.0   16.0 ANSI Diamond     industrial
1/2 x 5/16 40      12.7   7.9?   7.9?   3.92   1.5?   11.?   15.? ANSI “Japan 40”   industrial
1/2 x 5/16 08B           12.7   7.85   8.51   4.45   1.62   11.1   16.7 BS/DIN ocm.co.jp  industrial
1/2 x 5/16 428    12.7   7.97   8.43   4.45   1.50   11.0   16.4 JCAS “DMC 428”  motorcycle
1/2 x 5/16 08MC 428H  12.7   7.75   8.51   4.45   2.03   11.8   18.3 ISO   ZHC chain    motorcycle
1/2 x 5/16 08MC 428H  12.7   7.94   8.51   4.50   2.00   12.0   19.6 JCAS EK chain      motorcycle
5/8 x 1/4 10MA         15.9   6.25   10.2          2.40   11.1   18.9 ISO   mdmetric.com
5/8 x 1/4 520    15.9   6.35   10.2   5.24   2.00   10.4   18.6 JCAS EK chain      motorcycle
5/8 x 1/4 520    15.9   6.35   10.2   5.08   2.00   10.4   17.7 JCAS ZHC chain    motorcycle
5/8 x 1/4 520H  15.9   6.35   10.2   5.24   2.42   11.2   18.9 JCAS ZHC chain    motorcycle
5/8 x 1/4 520H  15.9   6.35   10.2   5.24   2.20   10.8   19.5 JCAS EK chain      motorcycle
5/8 x 5/16 525    15.9   7.94   10.2   5.08   2.03   12.0   18.7 JCAS ZHC chain    motorcycle
5/8 x 5/16 525H  15.9   7.94   10.2   5.24   2.42   12.8   20.4 JCAS ZHC chain    motorcycle
5/8 x 3/8 10A          15.9   9.40   10.2   5.08   2.03   13.5   20.7 BS    hzpt.com     industrial
5/8 x 3/8 10MB          15.9   9.40   10.2          2.00   13.4   20.9 ISO   mdmetric.com
5/8 x 3/8 50      15.9   9.53   10.2   5.08   2.03   13.6   20.1 ANSI Diamond      industrial
5/8 x 3/8 530    15.9   9.53   10.2   5.08   2.00   13.5   20.9 JCAS ZHC chain    motorcycle
5/8 x 3/8 530H  15.9   9.53   10.2   5.08   2.42   14.3   21.9 JCAS ZHC chain    motorcycle
5/8 x 3/8 530H  15.9   9.53   10.2   5.38   2.40   14.3   23.0 JCAS EK chain      motorcycle
5/8 x 3/8 532    15.9   9.53   11.1 JCAS                    (bigger roller)
5/8 x 3/8 10B           15.9   9.65   10.2   5.08 BS    Morse          industrial
5/8 x 3/8 12MA         19.1   9.40   11.9           2.40   14.2   25.9 ISO   mdmetric.com
3/4 x 3/8 630    19.1   9.53   11.9   5.95   3.20   15.9   25.2 JCAS EK chain      motorcycle
3/4 x 3/8 632    19.1   9.53   12.7 JCAS                    (bigger roller)
3/4 x 7/16 12B           19.1   11.7   12.1   5.72 BS    Morse          industrial
3/4 x 1/2 60      19.1   12.7   11.9   5.94   2.39   17.5   25.1 ANSI Diamond      industrial

 

==============================================================================

Vintage Moped Chains: Vintage bikes often have obsolete chains, or they specify the size in an obsolete way. Vintage equipment used the inch size, pitch x width. Modern motorcycles all use chain model numbers, like 428, 520, 630. The above chart shows that connection. In mopeds, there are 18 different chains, all size 415, or 1/2 x 3/16. They have different pin diameters and inner widths. In modern mopeds there are about 3 or 4.

Moped Chain History: When a shop installs a new chain, they throw the leftover pieces in a box. As the years go by, layers of chains accumulate, with the oldest ones at the bottom, as long as no one mixes up the pile.  That’s one way to “date” chains. At Myrons, certain boxes of parts have been untouched since about 1985 to 1995. Only one little scrap of modern 415H chain was in that material, from those years. Not even 415H master links were in that time zone. This little scrap is what Shaun believes to be the earliest example of a 415H chain. Shown below on the Motobecane sprockets, it’s gold and  says “Taiwan”. Taiwan bicycle products and machinery blossomed in the 1980’s. China made components came out about 15 years later.

Italian Chain History: At least five different Regina chains are original on 1970’s and 80’s Italian made mopeds, two that say “Regina Extra” and three that say “Regina” underlined.  See their pictures above. They all have different master links! Craziness!

Regina pin x width   plates      name                         closest master link                 next closest 
3.96  x  9.0      2.0    Regina Extra              4a.  reg1 (3.96 x 9.2-9.5)     420H (3.93 x 9.8)
3.89  x  8.4      1.7    Regina 415                3e. 415H (3.93 x 8.5) 
4.05  x  7.9      1.4    Regina Extra              5a.  reg2 (4.05 x 8.2-8.6)     415H (3.93 x 8.5)
4.05  x  9.0      1.8    Regina (underline)     5c.  puch (4.05 x 9.2-9.4)     420H (3.93 x 9.8)
4.14  x  8.9      1.9    Regina (underline)     6a. tom1 (4.14 x 9.4-9.6)

Tomos Chain History: At least seven different Tomos chains have been used over the years.

Regina Underlined Tomos A3 1970's

Regina
Italy
1970’s
3.89 x 8.4

W Circled early Tomos

W Circled
Germany
late 1970’s
4.05 x 7.9

W Circled late Tomos A3

W Circled
Germany
1980’s
4.14 x 9.4

ČZ chain Tomos A35 4.14 x 9.6

ČZ chain
Slovenia?
late 1990’s
4.14 x 9.6

CIC 415H Tomos A35 early 2000's 3.93 x 8.5

CIC 415H
Taiwan?
mid 2000’s
3.93 x 8.5

plain 415H Tomos A55 2007-on 3.93 x 8.5

415H
China?
late 2000’s
3.93 x 8.5

W Circled Germany 2013-on 4.14 x 9.6

W Circled
Germany
2013-on
4.14 x 9.6

 

Above, seven Tomos chains take three different master links. The pins range from 3.89 to 4.14mm thick. The inner width ranges from 7.9 to 9.6mm. “Inner width” means measured between the inside walls of the outer plates. A wider inner link will not fit inside a narrow outer link.

First the “Regina underlined” (3.89 x 8.4) on early A3, and “W circled” (4.05 x 7.9) also on early A3, then “W circled” (4.14 x 9.4) on late A3, then ČZ (4.14 x 9.6) on A35, then CIC 415H on late A35, and now plain 415H (3.93 x 8.5) on A55 models. The chains got thicker and wider and taller on the outside, as the decades progressed. The pins got thicker, and then thinner, and now thick again: 3.89 ->4.05 -> 4.14 -> 4.14 -> 3.93 ->3.93 ->4.14. Same thing with inner width: 8.4 -> 7.9 -> 9.4 -> 9.6 -> 8.5 ->8.5 ->9.6. Perhaps this is why Tomos stopped selling master links…

 

MB Front Sprockets With Rubbers

Motobecane front sprockets with rubber rings.
Left, the original IRIS chain, meshes correct.
Right, modern 415H, with taller plates,
rides up too high and does not mesh.

Motobecane front sprockets without rubbers.

Motobecane front sprockets without rubbers.
Left, the original IRIS still meshes good.
Right, the 415H meshes good now.
The end roller is cut away to see the fit.

 

 

 

 

 

 

 

 

 

Motobecane:  1970’s-1980’s Motobecane Mobylette 40, 50, or 50V mopeds, the front sprocket behind the large pulley has some rubber rings that interfere with modern 415H chains. Fortunately the two 1 1/4 inch rubber rings, one on each side of the sprocket, which can be removed with something like a curved dental pick. This issue of a chain not meshing because of  (unecessary) rubber noise dampener rings contacting the outer plates instead of the sprocket contacting the rollers, is one that probably occurs on other similar machines. Their name might begin with P…

Peugeot 103: Sometimes the newer “H” rated chains do not fit until after the bike is rode for a few minutes. The two rubber rings on either side of the original sprocket interfere with the larger outer plates on the 415H chain, causing the chain to run higher and not mesh well. After riding awhile the chain noise gets less, as the rubbers get squished and interfere less. Still, it is better to remove the pulley, and remove the rubber rings, shown at right, to have a smooth running chain.

Peugeot 102 front sprocket with original rubber rings. 415H chain does not mesh.

Peugeot 102/103 front sprocket with original rubber rings. 415H chain does not mesh.

Peugeot 102 front sprocket with rubber rings removed.

Peugeot 102/103 front sprocket with rubber rings removed. 415H wraps around fully.

Peugeot 102: This is the only US-model moped that uses a 42 chain, same sprocket as a 415 (1/2 x 3/16), but lighter duty (thinner pins, thinner and smaller plates). Sedis made both 415 chain for Peugeot 103, and 42 chain for the lighter weight Peugeot 102. Old Sedis chains are often cracked. Then they break/throw the chain. No fun. To use a modern 415H chain, the two rubber rings on either side of the sprocket must be removed, or it won’t mesh properly. See photos at right.

Motorized Bicycles 415 – Only Kind: Certain modern motorized bicycle gas engine kits use a 415 chain that passes very close to the engine case on both sides. These do not have enough room for the wider-on-the-outside 415H. They require a 415.

Motorized Bicycles:  415 and 410 Mixed: Certain modern motorized bicycle gas engine kits have a wide engine sprocket for 3/16 and a thin rear sprocket for a 1/8 chain. A 415 or 415H chain works but would be expected to have less retention (it would come off easier).

Motorized Bicycles:  Long Chain Runs: Motorized bicycles with long chain runs need chain guides and/or chain tensioners, or else the chain comes off when it slaps going over bumps, or when the frame or wheel flexes, or when the engine mounts shift/slip. The kits don’t usually come with any.

American Made Minibikes: There were many different manufacturers of minibikes back in the 60’s and 70’s but most of them used either a 35, 40, 0r 41 chain. Number 35 was used on most all 4-5-6 inch wheel minibikes while 41 was used on larger minicycles such as Rupp Roadster II and Speedway. Number 41 chain will not run on a number 40 sprocket. Number 40 chain will run on a number 41 sprocket but it will be wider than needed.

Fun Karts and Minibikes: Many chains have the chain size stamped directly on the chain links. #35, 40, 41 and 420 chain are used in the Fun Kart and Mini Bike industry. An 11 or 12 tooth clutch sprocket usually indicates the use of #35 chain. 10 tooth clutch sprockets usually indicate the use of #40, 41 or 420 chain.

More about ANSI chains:   http://chain-guide.com/applications/1-1-1-ansi-roller-chains.html

More about sprockets:  http://www.gizmology.net/sprockets.htm

More about International chains:  http://www.renold.com/Support/ChainInformationCentre/Chain_Standards.asp

 Why all of this madness about chains?   All through the 1970’s and 1980’s when you needed a master link for your moped, you had to get it from a dealer that sold that kind, or else you had to bring in your chain and hope they could find one that fit. If you had a Motobecane and you needed a master link, you could not get one from a Puch dealer, even if you showed them your chain. Their master links had thicker pins. For decades, owners have been frustrated when they bought a #415 master link for their chain, and it did not fit. That’s because there are 18 or so different 415-compatible chains. By the 1990’s no moped shop sold master links, instead they made you buy a whole chain. Thankfully, there is much better standardization in this century, in moped chains. But there are still a lot of older moped chains and substitutes that are all different. So it’s still not possible to tell (guess) what master link a customers moped needs over the phone. Some things never change… 

   


Pedal Parts

July 14, 2014

Contents:    1 Pedals    2 Pedal Cranks (Arms)   3 Pedal Pins   4 Pedal Shafts

Contents:    5 Pedal Freewheels   6 Pedal Chains   7 Pedal Chain Tensioners 

 


1   P E D A L S

 

These are new pedal sets, right and left, size 9/16″. The thread is 9/16 – 20. They fit all mopeds except Motobecane, Peugeot, and Derbi, and other French or Spanish-made mopeds, such as the Spanish-made Puch Magnum. 

41201 plastic $10

41124 classic $15

41559 platform $15

 

 

 

 

 

 

 

400000 block $17

67302 folding $25

 

 

 

 

 

 

 

Four kinds of moped pedal threads

Pedal threads: Most bicycle pedals have either 1/2-20 or 9/16-20 threads. But some vintage bicycles use “French thread” pedals, which is metric 14 – 1.25. The 14.0 mm thread is slightly smaller than 9/16″ (14.3 mm), but bigger than 1/2″ (12.7mm).

14mm pedals screw into 9/16 cranks all the way but fit loosely. Then later they break off or strip out easier.

9/16 pedals screw into 14mm cranks so tight they stop half way. Then later they break off or strip out easier. 

 

 


2   P E D A L   C R A N K S

 

Left and Right: With shoes it’s easy to tell if they’re on the wrong feet. But with moped cranks it is not. A left crank and pedal looks and functions the same as a right. So it is possible for a moped to have both left pedals and cranks, or both right, or the right on the left side and the left on the right side. Then when, say the left side pedal is missing, it might actually need a right, or visa versa.

Righty Tighty: This rule says “Viewed from above the bolt head, turning to the right, clockwise, is tightening”. Almost all bolts and nuts obey this rule because they are right hand thread. But left hand threads are opposite. They obey the opposite rule, “Lefty Tighty”. 

How to tell: It is sometimes not easy to tell if a pedal or a crank is left or right. Most modern bicycle pedals are stamped L or R. Most modern reproduction cranks are also stamped L or R. Most vintage European right cranks are stamped D (droit, destra, desno, derecho) or R (recht, right). Some vintage European left cranks are not marked, and some are stamped S (sinestra) or G (gauche) or L (levo, left).

Another way to tell is by viewing the threads directly. When a right thread bolt is held with the tail facing up, each thread slopes upward going from left to right. When a left thread bolt is viewed the same way, the threads slope in the opposite direction. With crank threads, right thread goes inward clockwise, left thread goes outward clockwise. You have to follow the first thread around in a circle with your eyes.

How not to strip threads: Knowing which way to turn, using lubricant, knowing how it should feel, knowing how tight it should be, and knowing how to use taps or dies or thread files to “clean up” damaged threads, before they fail completely. 

 

no.  reach length offset style pin  thread L/R  price  originally on    description    markings
431L  4¾”  5¾”   1½”   S2   9.0  9/16-20  L   $20  Minarelli left (sinestra) says     S
431R  4¾”  5¾”   1½”   S2   9.0  9/16-20  R   $25  Minarelli right (destra) says     D
432L  4¾”  5¾”   1¾”   S2   9.0  9/16-20  L   $20  Shorty high-offset left (sinestra) S
433L  4¾”  5¾”   1¼”   S3   9.5  9/16-20  L   $15  Minarelli or Morini replica left   L
433R  4¾”  5¾”   1¼”   S3   9.5  9/16-20  R   $22  Minarelli or Morini replica right R
434L  4¾”  5¾”   1¼”   S3   9.5  9/16-20  L   $20  Morini MO1, MO2 left (sinestra) S
434R  4¾”  5¾”   1¼”   S3   9.5  9/16-20  R   N/A  Morini MO1, MO2 right (destra) D
435R  4¾”  5¾”    ¾”    S5   9.0  9/16-20  R   N/A  Minarelli V1 right (destra) says  D
436L  4¾”  5¾”    ¾+   S6   9.0  9/16-20  L $20-$30  Vespa Ciao left (sinestra)     S
433 = 433L and 433R   S2   9.0  9/16-20 set  $30  beautiful chrome shorty repro set

no.  reach length offset style pin  thread L/R  price  originally on     description    markings
501R  5″¼  6″¼  1¼”   S2   9.5  9/16-20  R $15-$25  Batavus M48 right (recht)  R
501L  5″¼  6″¼  1¼”   S2   9.5  9/16-20  L $20-$30  Batavus M48 left (links)      L
502R  5″¼  6″¼  1¼”   S3   9.5  9/16-20  R   $18  Sachs 505 replica right (recht)  R
502L  5″¼  6″¼  1½”   S3   9.5  9/16-20  L   $20  Sachs 505 replica left (links)    
503R  5″¼  6″¼   ¾”    S5   9.5  9/16-20  R   N/A  Cimatti (Minarelli) right (recht) R
503L  5″¼  6″¼   ¾”    S5   9.5  9/16-20  L   $20  Cimatti (Minarelli) left (links)     L
504R  5″¼  5¾”    0″    S7   9.5  9/16-20  R $10-$15  Batavus M56 smooth right R
504L  5″¼  5¾”    0″    S7   9.5  9/16-20  L  $10-$15  Batavus M56 smooth left    L
505R  5″¼  5¾”    0″    S7   9.5  9/16-20  R  $8-$12  Trac M56 rough right says   R
505L  5″¼  5¾”    0″    S7   9.5  9/16-20  L  $8-$12  Trac M56 rough left says      L
501 = 501L and 501R   S2   9.5  9/16-20 set  $55  S2-style smooth chrome original set
502 = 502L and 502R   S3   9.5  9/16-20 set  $35  S3-style chrome rough-back repro set
504 = 504L and 504R   S7   9.5  9/16-20 set  $25  S7-style smooth chrome original set
505 = 505L and 505R   S7   9.5  9/16-20 set  $20  S7-style rough texture original set
no.  reach length offset style pin  thread L/R  price  originally on     description    markings
511R  5¼”  6¼”   1¼”  M2   9.5  9/16-20  R   N/A  Sparta Foxi right (recht)  says     R
511L  5¼”  6¼”   1¼”  M2   9.5  9/16-20  L   $25  Sparta Foxi left (links) says          L
512R  5¼”  6¼”  1¼”   M3   9.5  9/16-20  R   $25  Hercules-Sachs 505 right (recht) R
512L  5¼”  6¼”  1¼”   M3   9.5  9/16-20     N/A  Hercules-Sachs 505 left (links)     L
513R  5¼”  6¼”    ¾”   M4   9.5  9/16-20  R   $17  Tomos A35, A55, chrome repro right R
513L  5¼”  6¼”    ¾”   M4   9.5  9/16-20  L   $17  Tomos A35, A55, chrome repro left   L
514R  5¼”  6¼”    ¾”   M4   9.5  9/16-20  R   $17  Tomos A35, A55, black replica right  R
514L  5¼”  6¼”    ¾”   M4   9.5  9/16-20  L   $17  Tomos A35, A55, black replica left     L
515R  5¼”  6″¼    1″¾ M5   9.0  14-1.25  R   N/A  Peugeot 102 right (droite)  says       D
515L  5¼”  6″¼   1¼”  M5   9.0  14-1.25  L $15-$20  Peugeot 102 left (gauche)  says  G
516R  5¼”  6″¼    ¾+  M6   9.0  9/16-20  R $12-$18  Vespa Grande, Si right (destra) D
516L  5¼”  6″¼    ¾”   M6   9.0  9/16-20  L $20-$30  Vespa Grande, Si left says nothing
517R  5¼”  6″¼    ½”   M6   9.5  9/16-20  R   $20  pre-1987 Tomos A3 right (desno) D
517L  5¼”  6″¼    ½”   M6   9.5  9/16-20  L   N/A  pre-1987 Tomos A3 left (levo)       L
518R  5¼”  6″¼   0″½ M7   9.5  9/16-20  R   $20  1970-95 Jawa right (pravo) says   P
518L  5¼”  6″¼   0″½ M7   9.5  9/16-20  L   $20  1970-1995 Jawa left (vlavo) says   L
513 = 513L and 513R   M4   9.5  9/16-20 set $30  Tomos replica beautiful chrome set
514 = 514L and 514R   M4   9.5  9/16-20 set $30  Tomos replica black powder coat set
no.  reach length offset style pin  thread L/R  price  originally on     description    markings
521R  5½”  6½”   1″¼ M4   9.0  14-1.25  R $15-$22  Motobecane right (droit) says   D 40
521L  5½”  6½”   1″¼ M4   9.0  14-1.25  L $18-$25  Motobecane left (gauche) says  G 40
522R  5½”  6½”   1″¼ M4   9.0  9/16-20  R $25-$32  Motobecane right re-threaded  D 40
522L  5½”  6½”   1″¼ M4   9.0  9/16-20  L $28-$35  Motobecane left re-threaded    G 40
523L  5½”  6½”   1¼”  M4   9.0  14-1.25  L $25-$30  MB left, 1/4″ extra offset says   G 40
524L  5½”  6¼”   0″¼ M7   9.5  9/16-20  L   $15  unidentified vintage European says L
521 = 521L and 521R  M4   9.0  14-1.25 set  $45 M4-style Motobecane original thread set
522 = 522L and 522R  M4   9.0  9/16-20 set  $65 M4-style Motobecane re-threaded set
no.  reach length offset style pin  thread L/R  price  originally on     description  markings
531R  5¾”  6¾”   1¼”  M2   9.0  14-1.25 $12-$20 Peugeot 103 right
(droit) says V.P. D
532R  5¾”  6¾”   1¼”  M2   9.0  9/16-20  R $22-$30 Peugeot 103 right re-threaded V.P. D
533R  5¾”  6¾”   1½”  M4   9.5  9/16-20  R   N/A  Columbia-Solo right (recht) says     R
533L  5¾”  6¾”   1½”  M4   9.5  9/16-20  L   $25  Columbia-Solo left (links) says nothing
534L
 
5¾”  6¾”   1¼”  M5   9.0  14-1.25  L $20-$30  Peugeot 103 left  says nothing
535L  5¾”  6¾”   1½”  M2   9.0  14-1.25  L   N/A  French replica left (gauche) says     G
535R  5¾”  6¾”   1½”  M2   9.0  14-1.25  R   N/A  French replica right (droite) says     D
536R  5¾”  6¾”   ¾”0  M6   9.0  9/16-20  R $20-$30  pre-1977 Garelli w/groove right  D

536L  5¾”  6¾”   ¾”0  M6   9.0  9/16-20  L   N/A       pre-1977 Garelli with groove left  S
537R  5¾”  6½”   1½”  M3   9.5  9/16-20  R   N/A    Avanti (Garelli remake) right says    R
537L  5¾”  6½”   1½”  M3   9.5  9/16-20         Avanti (Garelli remake)  left  says    L
538R
  5¾”  6½”    1″¼ M6   9.5  9/16-20  R $15-$20  Kreidler MP9 right (recht) says   R

538L  5¾”  6½”    1″¼ M6   9.5  9/16-20  L $25-$30  Kreidler MP9 left (links) says nothing
539L  5¾”  6¾”   1½”  M2   9.0  9/16-20  L   $27  Peugeot replica left (gauche) re-threaded
539R  5¾”  6¾”   1½”  M2   9.0  9/16-20  R   $27  Peugeot replica right (droite) re-threaded
531 = 534L and 531R  2&5  9.0  14-1.25 set $40  Peugeot 103 original M2 & M5-style set
535 = 535L and 535R  M2   9.0  14-1.25 set N/A
  French replica both M2-style chrome set
539 = 539L and 539R  M2   9.0  9/16-20 set $50  French replica both M2 re-threaded set

613 Puch replica cranks

no.  reach length offset style pin  thread L/R  price  originally on     description    markings
601R  6″   7″¼   1¼”  L3   9.0  14-1.25 $15-$22  Derbi Variant right (derecho) D
601L  6″   7″¼   1¼”  L3   9.0  14-1.25  L $15-$22  Derbi Variant left (izquierda)
603L  6″   7″¼   1½”  L3   9.0  9/16-20  L $25-$35  Garelli left (sinistra) says nothing
604R  6″   6¾”     ¾”  L6   9.0  9/16-20  R $18-$25  Garelli right (destra) says      D
605R  6″   6¾”     0″   L7   9.5  9/16-20  R $15-$25  KTM Foxi right (recht)  says    R
605L  6″   6¾”     0″   L7   9.5  9/16-20  L $15-$25  KTM Foxi left  (links)  says nothing
603 = 603L and 604R 3&6 9.5  9/16-20 set $45-$60 Garelli VIP orig. M3 & M6-style set
no.  reach length offset style pin  thread L/R  price  originally on     description    markings
611R  6¼”  7½”   1½”   L0   9.5  9/16-20  R $20-$35  Puch Maxi 2-speed right says R
611L 
6¼”  7½”   1½”   L0   9.5  9/16-20  L   N/A  Puch Maxi 2-speed left says nothing
612R  6¼”  7½”   1¼+  L1   9.5  9/16-20  R $20-$25  Puch Maxi right (recht) says R

612L  6¼”  7½”   1¼+  L1   9.5  9/16-20  L $20-$30  Puch Maxi left (links) says nothing
613R  6¼”  7½”   2″¼  L0   9.5  9/16-20  R   $16  Puch Maxi replica right says       R
613L  6¼”  7½”   2″¼  L0   9.5  9/16-20  L   $23  Puch Maxi replica left says        
L
613 = 613L and 613R   L0   9.5  9/16-20 set  $35  Puch Maxi replica beautiful chrome
no.  reach length offset style pin  thread L/R  price  originally on     description    markings

621L  6½”  7¼”    0″    L7   9.5  9/16-20  L $7-$10  1970’s 10-speed bicycle left

 

434L, 434R Morini MO1 MO2

503R 1976-78 Cimatti

Shown here are the S3-style vintage Italian original pedal cranks on Italian (mostly) mopeds with Morini MO1, MO2, M1 engines. These cranks need to be the S3 or M3 style, that “goes outward right away”, because the engine sticks out close to the pedal shaft.

Besides clearing the engine when the crank is horizontal, sometimes this style crank is needed to clear the covers above the engine, when the crank is vertical. 

 

512L, 512R Hercules with 505

518R, 518L ’70-95 Jawa

Shown here are the M3-style vintage German original pedal cranks on Hercules mopeds with Sachs 505 engine, such as the US-model “Sachs Balboa”. On a Taiwan moped with a Sachs 505 engine, such as “General 5-Star ST”, the pedal cranks are Taiwan made compatibles, that look different but have about the same dimensions and same style.

These “go outward right away”, not to clear the engine, but to clear the covers above the engine, when the crank is vertical.

 

514L, 514R 1986-later Tomos

517R Tomos A3

Shown here are the M4-style modern Slovenian original pedal cranks on 1986 and later Tomos mopeds, from late A3 to A35 and A55 engine models. Here the 2009 Tomos A55 engine pedal shaft is much longer than it needs to be, by 3/4″ on the left, and 1 3/4″ on the right, as you can see.

Back in the day, moped engines (and people) were thinner. The early 1974-79 early A3 pedal cranks did not have or need much offset, as shown at right.

 

521L bent inward

521L, 521R Motobecane

Shown here are the M4-style vintage French original pedal cranks on Motobecane Mobylette mopeds 1972-1980+. On variator models, like 50V, the engine swings back as the bike speeds up. The clutch wheel often scrapes against the left pedal crank. On non-variator (Dimoby) models, like 50 or 40, the engine does not swing back as the bike speeds up (but it does swing to keep the belt tight). On those models there is also 3/8 inch more space between the clutch wheel and the pedal crank. So they “never” scrape.

 

531R 76-83 Peugeot 103

Here is a M2-style vintage French right crank, on 1975-83 Peugeot 103 mopeds. The right arm has sharper bends than left, because the right cover is closer to the pedal arm. The left is a M5-style, with a more gentle bend.

 

 

 

 

603R ’78-83 Garelli VIP

603L ’78-83 Garelli VIP

Here are vintage Italian L6-style right and L3-style left crank arms for 1977-83 Garelli Gulp, VIP, and maybe Monza. The left has more offset than the right. It needs the L3 style that “goes outward right away” because the left side of the engine sticks out near the pedal shaft.

 

 

 

601L, 601R Derbi Variant

606L, 606R Derbi Variant Sport

 

Shown at left are L3-style vintage Spanish crank arms for 1975-1986 Derbi Variant.

Shown at right are higher offset L3-style Spanish arms for 1986-89 Derbi Variant Sport.

Like Tomos and Garelli the later engines were wider.

 

 

611L, 611R 1978-86 Puch

Puch type threads
are intentionally
made weaker

Shown here are the L0-style vintage Austrian cranks on 1978-86 Puch Maxi and Magnum models. There are also L1-style Puch cranks, on 1968-78 Puch Maxi. Those are the same dimensions except the bend is more sharp.

What were they thinking? Pedal cranks for Puch mopeds have about 1/3 of the threads removed by machining. This makes them get stripped easier. The only plausible explanation is Puch was thinking about safety. When a rider forgets where the pedals are, and leans over in a turn, one pedal can hit the ground. If it hits hard enough it can cause a crash. Puch pedals are designed to break away, rather than causing a crash. 

Pedal Crank Selection:

Offset: Ideally the pedal arms should have enough offset to not hit anything, even after being bent inward a little, yet not have too much offset. Too much offset causes the pedals to hit the ground sooner when leaned over, and to stick out more when parking or storing, and to hit the riders feet more when backing up.

Length: Longer pedal arms provide more leverage. For mopeds the pedals are mainly used for starting the engine, rather than pedaling. So if the engine turns over easily then long pedal arms are not needed. Longer arms hit the ground sooner when leaned over. And when not pedaling, one foot is more forward and the other is more back. So shorter arms are better, in many ways. But for pedaling, longer arms are better, especially for riders with long legs.

Style: Some engines or bikes need cranks that “go outward right away” because something is sticking out near the pedal shaft. This is the style S3, M3, and L3 above. Sachs 505, Morini MO1, MO2 and Garelli VIP engines are some common examples.

 

Pedal Crank Service:

Straightening a crank.
The bend forms about
1-2″ inch below the tool.
Here it is held high up.

VAR pedal arm bender.
This has straightened
500 bent arms, saving
customers $10,000

Straightening: 1. With a special tool like the one shown, and two people, a bent pedal crank can be straightened in one minute without any removal. The second person has to pull on the bike the opposite way, by standing hard on the opposite pedal. 2. Without that tool, the pedal only is removed and a long pipe that fits closely over the crank is used to apply torque. 3. For more stubborn cranks, the crank is removed and placed in a large bench vise. Again the pipe is placed over the crank at the right place, and torque is applied. Moped cranks require 100 to maybe 600 foot-pounds of torque to bend. This is done without heating.  

Re-threading a crank

Re-threading: Often just the first few threads become messed up. Bicycle shops have pedal taps, size 9/16-20 Right and Left, that can repair partially-stripped threads on moped cranks. Hardware stores do not have those taps, instead they have 9/16-18, more coarse. So pedal taps are a bicycle-industry-only item. 

Repairing pedal crank threads is done by starting the tap from the good side, which is the back. Sometimes crank removal is required, and sometimes it is optional. Cutting fluid, or at least oil, is applied. The tap is moved back and forth as it is screwed in (like 4 steps forward and 3 steps back), until it goes all the way through.

Rethreading a M14-1.25 crank to 9/16-20 (from 14.0 to 14.3mm) is more difficult. The plated steel is hard and tough. It takes longer and requires more force. The crank arm and tap get hot by the end of the 10-20 minute process.  

 

 


3  P E D A L   P I N S

Pedal Crank pins

Pin removal

These round pins have a flat wedge that fits tight against a slot in the shaft. They are pressed or hammered in and out. In the bicycle industry they are known as cotter pins. Here they are called crank pins or wedge pins.

Two sizes 9.5 mm $2, and 9.0 mm $2 each.

 

One Up One Down: This rule says that if one crank pin points up, then the other should point down. This makes the left and right crank arms parallel at 12 o’clock and 6 o’clock. When the pins are both up, the arms are at 12 o’clock and 5 o’clock, lopsided and awkward.

 


4  P E D A L   S H A F T S

Some mopeds with external pedal shafts, and separate pedal and motor chains, have one of the crank arms permanently attached to the shaft and sprocket. With those, to get a new sprocket-side arm you have to replace the shaft-with-arm.

Some mopeds with external pedal shafts, and separate pedal and motor chains, have no crank arms permanently attached to the shaft and sprocket. With those the sprocket-side arm can be replaced.

More on this parts topic, later…

 

 

 


5  F R E E W H E E L S

Some mopeds have one drive chain and some have two. Two-chain mopeds, with both a motor chain and a pedal chain, have freewheels, like most bicycles. The freewheel is the rear pedal sprocket that spins free and goes “click click click” in the reverse direction, but locks up solid in the forward direction. The freewheel allows the pedals to be stationary even when the rear wheel is moving forward. The moped brands with right-side freewheels are Puch, Peugeot, Motobecane, Batavus, Sparta (Foxi), Hercules (Sachs), Piaggio (Vespa), Honda (PA50), Kreidler, KTM (Foxi), Kynast, Flandria. There are two brands with left-side backward freewheels, Jawa and Benelli. All of the other moped brands do not have external freewheels, but instead have a freewheel mechanism inside the engine unit.

The freewheel screws on and tightens with pedaling. Once it is tight, a special tool is required to remove it. The tool fits into slots in the freewheel center. Some low-end modern single-speed bicycle freewheels do not have removal slots. Those cheap kinds can be removed by destroying the freewheel. To remove a freewheel destructively without a removal tool, the freewheel is first disassembled, where all the little balls and clickers fall out, and then the inner hub is unscrewed in a bench vise or with a pipe wrench.

Most freewheels go on the right side of the bike and thus have right-hand thread, but Jawa and Benelli ones go on the left side of the bike and have left-hand thread. 

 

16a generic 16T
by Dicta
made in Taiwan

16b MB 16T #60483
by The Best Wheel
made in France

16c Hercules 16T
by Esjot
made in Germany

16d Sparta 16T
by Atom
made in France

16h Motobecane 16T
by Atom, #16057
made in France

 

 

 

 

 

 

 

 

18b Motobecane 18T
by The Best Wheel
#15244 French thread

18d left hand Jawa 18T
by Velo, says date 76-78
made in Czechoslovakia

18e generic 18T
by Sunlite

 

 

 

 

 

 

 

 

20a Motobecane 20T
by The Best Wheel
#14298 made in France

20c Kynast 20T
by Esjot
made in Germany

20e generic 20T
by Sunlite

23a Puch 23T
by Atom-Maillard
made in France

 

 

 

 

 

 

 

 

 

Original and Replacement Freewheels

no. freewheel make  country     bike make  part #  teeth    thread    price   original on


16a Dicta xxxxxxxx Taiwan xxx replacement  0000  16T  1.375″- 24  $12

16b The Best Wheel France xxxMotobecane 60483  16T  1.375″- 24  $25  Solex

16c Esjot  xxxxxxx Germany Hercules 9000300401 16T  1.375″- 24  $30  Sachs Westlake (P1) 

16d Atom xxxxxxxx France xxx Sparta 00. 055051  16T  1.375″- 24  $25  Sparta Foxi
16d Atom   xxxxxxx France xxx Peugeot xxx39026  16T  1.375″- 24  $25  Peugeot (optional)
16d Atom xxxxxxxx France xxx Motobecane 16057  16T  1.375″-.24  $25  Motobecane 7

16e Ocean xxxxxxx Italy xxxxx Piaggio 000114531  16T  1.375″- 24  $25  Piaggio Ciao, Si early


18a Atom xxxxxxxx France xxx Peugeot 00017550  18T  1.375″- 24  $30  Peugeot 102, 103
18a Atom xxxxxxxx France xxx Batavus 00049020  18T  1.375″- 24  $30  1976-77 Batavus VA

18b The Best Wheel France xxxMotobecane 15244  18T  M34.7-1.0  $50  70’s MB with MB hubs
18b J Moyne xxxxX France xxxMotobecane 15244  18T  M34.7-1.0  $50  Wards Riverside (AV88)
18b The Best Wheel France xxxMotobecane 15244  18T  M34.7-1.0  $50  50’s-60’s Motobecane

18c Ocean .xxxxxxx Italy .xxxx Piaggio 00 103631  18T  1.375″- 24  $25  Piaggio Bravo, Grande

18d Velo xxxxx Czechoslovakia  Jawa  xxxx070040  18T  M35 -1 LH   $35  1970-83 Jawa 28, 207

18e Sunlite xxxxxxx China x.xxxreplacement  0000  18T  1.375″- 24  $15 


20a The Best Wheel France xxxMotobecane 14298  20T  1.375″- 24. $20  70’s MB with Leleu hubs
20a The Best Wheel France xxxMotobecane 14298  20T  1.375″- 24. $20  1978-81 MB with mags

20b Atom   xxxxxxx France xxx Batavus 00049019  20T  1.375″- 24  $30  Batavus HS50,Starflite
20b Atom   xxxxxxx France xxx Peugeot 00000586  20T  1.375″- 24  $30  Peugeot (optional)

20c Esjot  xxxxxxxx Germany x Kynast  00000586   20T  1.375″- 24  $22  Flying Dutchman

20e Sunlite  xxxxxx China xxx xreplacement  0000  20T  1.375″- 24  $17


23a Atom  .xxxxxxx France xxx Puch  3492410230  23T  1.375″- 24  $20-$30 Puch (all models)

 

Freewheel threads: Like with pedal threads there is a common size and an uncommon size slightly smaller.

The common size is 1.375″ – 24, which equals 34.92 – 1.06 mm. Most modern bicycles worldwide have this ISO (International Standards Organization) standard freewheel thread type. 

The uncommon size is M34.7 – 1.00, which equals 34.70 – 1.00 mm. This “French” thread type is on vintage bicycles from France, Belgium, Spain or Switzerland, and on Motobecane mopeds with Motobecane-made hubs.

So the French freewheels are slightly smaller than the rest of the world, 34.7 instead of 34.9. That small amount does not matter as long as the bike is pedaled gently. But it does matter when the pedals are pushed very hard. Then the loose fitting threads on the wheel hub can strip out, a disaster.  

It is difficult to tell which thread type a hub has, by measuring the thread tops with a calipers. The 34.92 thread hubs measure 34.65 to 34.7. The 34.70 hubs measure 34.55 to 34.6. On some hubs the tops of the threads are worn down and measure less. So a standard thread might seem like a French thread type. Because of this, it is better to put away the calipers and use “feel”.

When the freewheel and hub have the same thread type, the freewheel screws on easy, yet has no looseness. Looseness is felt with fingertips pulling and pushing the freewheel center side to side. When a 34.92 freewheel is on a 34.7 hub, the center of the freewheel can move 0.22 mm.  Here is a video of that. That looseness or “wiggle” is felt. The same is true for any threaded thing. When a bolt fits a nut, it screws on easy and yet does not wiggle.    

All of the freewheels in Myrons Mopeds inventory were measured by feel. For each bike model listed above, a sample rear wheel with original freewheel was measured directly by feel. The freewheel was removed. It’s threads were checked by screwing onto both a French and a standard hub. The wheel threads were checked by screwing on both a French and a standard freewheel.

Gauntlet of test wheels: MB 40, Batavus M48, Peugeot 103, Model 7 hub, MB 50, MB 50, MB 50VLA.
Not shown, Puch wheels and hubs, Sparta, Peugeot 102 hub, Kreidler, Sachs, KTM, Kynast, others.

Result: None of the hubs or freewheels had French thread, except Motobecanes with Motobecane-made hubs. Wow!

1970’s Puch & Motobecane 80mm hubs
L, Leleu-made Puch hub, standard thread
R, Motobecane-made hub, French thread

These are actual Motobecane rear wheels from Myrons inventory. All except one came from Los Angeles area bikes.

model xx rim x hub xx freewheel xxx teeth  thread
40XXxxX thin   MB xx  none xxxxxxxx 18T   French
40XXxxX thin   MB xx  none xxxxxxxx 18T   French
50XXxxX wide  MB xx  none xxxxxxxx 18T   French
50XXxxX wide  MB xx  none xxxxxxxx 18T   French
50XXxxX wide  MB xx The Best Wheel 18T   French
Model 7X 16″  Leleu x  none xxxx x xx xxx  standard
50VXxxX wide Leleu x  none xxxx x xx xxx  standard
50VXxxX wide Leleu x The Best Wheel 20T  standard
50VXXxx wide Leleu x The Best Wheel 20T  standard
50VLAxx mag  silver x The Best Wheel 20T  standard
LeMoped mag  gold xx  none xxxxx xx xxx  standard
LeMoped mag  gold xx The Best Wheel 20T  standard

Result: All Leleu-made hubs have standard freewheel thread 1.375″-24, even those for Motobecane. All Motobecane-made hubs have French thread M34.7-1.0. All Motobecane-made “6-star” mag wheels have standard thread, but it is tapered and begins with French thread, so that either type of freewheel can be used.

1975 Motobecane 50S
with MB-made hubs

1978 Motobecane 50V
with Leleu-made hubs

 

How to tell: The best way to tell if a 1970’s Motobecane moped rear hub is Motobecane-made (and therefore French thread) is visually. There is an prominent M logo on the freewheel side. There is no step on the freewheel side, instead it slopes gradually. The flanges go farther out from the spoke holes. So from 100 feet away, viewed from the side, the Motobecane-made hubs appear larger than Leleu-made hubs.

 

Summary

All two-chain rear hubs or wheels, on mopeds from the 1970’s and 80’s, have standard freewheel threads, except Motobecane-made hubs on 1950’s -60’s and some 1970’s Motobecane mopeds.

A standard thread freewheel fits a French thread hub and works fine when pedaled normally. Only when a strong athletic person pedals very hard, the hub threads can strip off, requiring wheel or hub replacement. 

 

Motobecane 100mm hubs
are also French thread

1950’s – 60’s Motobecane: Many models, maybe all, had French freewheel threads M34.7-1.0. In the 1960’s the parts manuals specified the thread. One example, shown at right, is for Motobecane AV88 and Motoconfort AU88. It lists the 18-tooth 15244 freewheel as having M34.7-100 thread. 

The French freewheel thread cover up: It is very odd that, after 1976-77, Motobecane had two different freewheel threads, but they hid that fact. Instead they made the teeth different, 15244 (French thread) was 18 teeth, and the newer 14298 (standard thread) was 20 teeth. The Motobecane America parts manuals list both freewheels without explanation. There does not seem to be anything about freewheels in the Parts or Service Bulletins. The physical freewheels do not say the thread. The actual parts labels do not say the thread either. As a result, this cover-up has caused confusion and mystery for 39 years (1978-2017).

 


6  P E D A L   C H A I N S

 

 


7  P E D A L   C H A I N   T E N S I O N E R S

 

 

 

freewheel teeth  thread  price  applications
16 tooth  1.375-24 thread  $15  Sparta Foxi