Steering

May 14, 2015

Bicycles are external, motorcycles are internal.

Welcome. Steering bearings on most bicycles are external type, where the bearings lie outside the frame head tube (which is “not stepped”). Steering bearings on most motorcycles are internal type, where the bearings lie inside the frame head tube (which is “stepped”). All mopeds have the bicycle type steering bearings, except Derbi, which has motorcycle type.

Balls Up or Balls Down is the famous question faced when installing retainer (caged) ball bearings. The lower bearing always faces balls down, but the top bearing is sometimes facing up, and sometimes facing down. When it is installed wrong the cage gets crushed. The answer is: the balls always face the “cone” and not the “cup”, regardless of “up” or “down”. Sometimes the upper frame race is a “cone”, sometimes it is a “cup”.

Any bearing, when pushed together lightly with your fingers, should feel like the balls are rolling. Nothing should feel like it’s scraping or sliding. When you see the balls rolling at half the rotation speed, and the feel is solid and smooth like an ice cube on a smooth table, then the bearing is correct and good. 

Caged Balls or Loose Balls can be interchanged. The cage/retainer is a convenience, that keeps the balls from falling out during installation. If the retainers are the wrong size, or bent, but the balls are correct, the balls can be popped out, and installed using grease to hold them. When the cage is eliminated, almost twice as many balls are required, enough to fill the circle with a half to one ball gap. This has another big benefit on worn out races that have dents where each ball was at. When the number of balls changes, say from 14 to 26, the dents do not line up anymore. So it’s almost like having a new race.

Bicycle headset threads and dimensions, from Sutherlands

Bicycle headset threads and dimensions, from Sutherlands Handbook

Slight Differences in steering threads have frustrated many bicycle and moped mechanics trying to substitute steering parts from one machine to another. At right is a chart of bicycle headset threads and sizes. Basically the whole world uses ISO threads, one inch with 24 threads per inch (25.4 x 1.06), except France (25.0 x 1.00), Austria (26.0 x 1.00), Raleigh (25.4 x 1.02), and motorcycles (24.0 x 1.00). None of these thread sizes interchange. They either won’t screw on, or they will screw on loosely, and later slip around and “strip”. 

Slight Differences in “30mm” frame cups, from 30.0 to 30.2 millimeters, turn out to not matter, ordinarily. Only when the fit is already too loose on a 30.2, or too tight on a 30.0, would it matter.

30.0 replacing 30.2: Take a moped frame that has 30.2 cups and pound one cup out with a hammer and punch, alternating sides. Then take a 30.0 cup and hammer it in. You will only have to strike it about half as hard, because it has a looser press fit. It will hammer out easier.

30.2 replacing 30.0: Take a moped frame that has 30.0 cups and pound one cup out with a hammer and punch, alternating sides. Then take a 30.2 cup and hammer it in. You will have to strike it about twice as hard, because it has a tighter press fit. It will hammer out less easy.

There is much confusion about what is 30mm, the cup outer, or the frame inner. A frame for 30.0 cups can be 29.7 to 29.9 mm inner diameter (id). A frame for 30.2 cups can be 29.9 to 30.1. Some cups are made in between, 30.1 mm. The cups for sale below are classified as “30.0 cups” if they measure 29.9 to 30.15 mm. They are classified as “30.2 cups” if they measure 30.16 to 30.25 mm.

Slight Differences in “32.5mm” frame cups, from 32.5 to 32.7 millimeters, turn out to not matter, ordinarily. They range from 32.5 to 32.7, with most around 32.6. 

 

 


1. #52     2. #65     3. #73     4. “Euro”

Bearing Retainers

1   #52 retainer, 15 – 3/16″ balls  31.5 id      $5.00
For traditional American bicycles, AMF, Colombia, etc.

  #65 retainer, 15 – 3/16″ balls  28.5 id      $2.00
For traditional Schwinn bicycles, BMX, and low-end ATB.

3   #73 retainer, 16 – 5/32″ balls  29.0 id      $1.50
For traditional ten-speed bicycles, standard bikes, childrens.
A good substitute for the European 14 – 5/32″ ball retainer.

4   “Euro” retainer, 14 – 5/32″ balls 27.0 id    $8.00
This is like a #73 retainer with an inner lip for stiffness.

Loose Balls

1   5/32 inch (#5) balls (3.97mm), pack of 26        $2   26 loose 5/32″ balls can replace a “Euro” 14-ball retainer. 
For light duty moped and bicycle headsets.                 26 loose 5/32″ balls can replace a #73 16-ball retainer.

2   3/16 inch balls (4.76mm), package of 26          $2   22 loose 3/16″ balls can replace a #65 15-ball retainer. 
For heavy duty headsets, and some wheels.                22 loose 3/16″ balls can replace 21 loose 5mm balls

3   5 millimeter balls (5.00mm),  pack of 21           $5   21 loose 5mm balls can replace 22 loose 3/16″ balls
For Puch Magnum, Sears Free Spirit, and Tomos.          More balls, or bigger balls, can carry more weight.

 

 

Headsets and PartsMyrons Shirt green

In ascending order of thread size (fork), then cup size (frame).

After years of ignorance and misunderstanding, moped headset items have been identified, measured, verified, and presented below. With these measurements and specifications, it is possible to find correct replacements by measuring their sizes precisely with a calipers or a micrometer, and then matching it with the pictures and or brand names below, hopefully. These things have to be somewhat precise. If something is too tight it might not go on. If it’s too loose, or mismatched, the bike might be difficult to control, or be unpleasant to ride.

 

24.0 x 1.00 mm thread

 


Left: External Bearings Right: Internal Bearings

Derbi           24.0 x 1.00 (0.94″- 25.4 tpi), internal

Derbi mopeds have internal steering bearings, like motorcycles have. You can see on the Derbi at the right, the bearings are not visible. But on the Sparta Foxi on the left, the steering bearings are visible above and below the frame head tube. The Sparta has external steering bearings, as do all other mopeds.

Japanese motorcycles usually have this 24×1 thread on the top nut, but further down the steering tube steps up to 25×1 or 26×1 or bigger, where the bearings go.

 

 

25.0 x 1.00 mm thread

 


Peugeot Headset, 25-1.0 thread, 30.0 cups

Peugeot headset, 25-1.0 thread, 30.0 cups

Peugeot       25.0 x 1.00 (0.98″- 25.4 tpi), 30.0 cups

1         51974  complete set #2-10                   $40
2         48684  top chrome cap, press fit            $10-$18
3         51646  lock nut, 5 tall, 32 hex                 $5-$7
4         56118  lock washer serrated                   N/A
5         91783  adjustable cone chrome               $4-$6
5a  This little “nub”, from Peugeot bicycles, must be ground off.
5a  It goes into a ring of holes, a special “holey” washer, not #4.
6         91778  upper frame cup chrome 30.0 od  $8
7        91502a upper balls, 26 – 5/32″ 3.97mm   $2 or use #73
8         91502  lower “Euro” retainer 14-5/32″    $8 or use #73
9         46840  lower frame cup chrome 30.0 od  $8
10       14512  lower cone (crown race)  26.7 id  $5-$8
30.0 cups will replace 30.2 ones. They just press in easier.


Motobecane headset, 25-1.0 thread, 30.2 cups

Motobecane 25.0 x 1.00 (0.98″- 25.4 tpi), 30.2 cups

1         23312  partial set #3,5,6,7,8,9              N/A
2         15528  top plastic cap, press fit            $10$18
3         15526  lock nut, 32 octagonal                $6
4         00000  plain washer 25x35x1                 $2
5        23016a adjustable cone, zinc plated       $8-$12
6        23016b upper frame cup, zinc   30.2 od  $7
7         00005  upper balls, 26 – 5/32″           $2/26 or use #73
8         00005  lower balls, 26 – 5/32″           $2/26 or use #73
9         14208  lower frame cup, zinc   30.2 od  $7
10       19859  steering tube with lower race       N/A
11       14606  lock plate/washer                       $4
12       14605  pivot bolt M20-1.0, 32 oct          $15

 


Vespa Grande set, 25- 1.0 thread, 33.0 cups

Vespa Grande set, 25- 1.0 thread, 33.0 cups

Vespa Grande 25.0 x 1.00 (0.98″- 25.4 tpi), 33.0 cups

Vespa Grande headset is unique, heavy duty, French thread.
3       G68856  chrome cap nut, 32 hex, 25×1    $12-18
3a     000000  Piaggio emblem pressed-in           N/A
4       306912  thin washer for nut                        $3
5       G21316  adjustable cone, 25×1, notched   $15
6       G22937  upper frame cup, zinc    33.0 od   N/A
7       G21317  upper balls, 27 – 3/16″ 4.76mm    $2/27
8       G21317  lower balls, 27 – 3/16″ 4.76mm    $2/27
9       G22937  lower frame cup, zinc    33.0 od    N/A
10     G21315  lower cone (crown race)  25.6 id    N/A
The Grande crown race is only 25.6 id, and the fork is 25.7.

 

25.4 x 1.06 mm thread

 


Honda PA50 set, 1"-24 thread, 30.0 cups

Honda PA50 headset, 1″-24 thread, 30.0 cups

Honda PA50  25.4 x 1.06 (1.00″- 24.0 tpi), 30.0 cups

The Honda PA50 Hobbit (Camino) is made in Belgium.
It is mostly European in design and components.
3     00000000 chrome cap nut, original              N/A  use bicycle

4     00000000 washer 26x32x1.5                       $3

5     00000000 adjustable cone chrome              N/A  use bicycle
6+9 00000000 frame cup chrome, each 30.0 od $5 2.0 thin wall
7+8 00000000 orig. retainer 14-5/32″ each        $8   
7+8 JB-1909    #73 retainer, 16-5/32″ each        $1.50
10   00000000 lower cone (crown race) 25.7 id N/A
10
This is the original crown race size. It was loose on the fork.
Three samples of Honda PA50 original forks were like this.
The fork steering tube is a straight 25.4mm all the way down.
So there needs to be a 0.15mm hard steel strap under the race.


General headset, 1"-24 thread, 30.0 cups

General headset, 1″-24 thread, 30.0 cups

General            25.4 x 1.06 (1.00″- 24.0 tpi), 30.0 cups

2    1150-5860 chrome cap nut, original             $20  use bicycle
3    1150-5895 stepped notched nut, 31.8 lip      $15
The bottom side of nut #3 has a lip that fits inside #4a.
That’s why the holes in #4 and #4a are big, 32 not 26.
This lip carries the side loads through the nut threads,
instead of the fork top pressing on the threads directly.
1960’s small Honda motorcycles had this design.
4    1150-5894 plain washer 32x44x0.5               $5
4a  3150-5885 fork top plate, 31.8 hole             N/A
4b  1150-5886 spacer tube  26x41x8                  $7
5    1150-5893 adjustable cone chrome             $15
6    1150-5892 upper frame cup chrome 30.0 od $15
7+8 1150-5890 loose balls, 23 – 3/16″ 4.76mm   $2/26
9    1150-5891 lower frame cup chrome 30.0 od $15
10   JB-2742    lower cone (crown race)  27.0 id   $7
Asian mopeds use the Japan Industry Standard (JIS). General, Lazer, Grycner, Clinton, Jui Li, AMS, Tas, Tym, etc.


Tange Levin CDS Headset

Tange Levin CDS sealed precision headset

Bicycle (JIS)  25.4 x 1.06 (1.00″- 24.0 tpi), 30.0 cups

JB-35496  EC30/27 Tange Levin sealed headset $30
0000000   upper frame cone black  30.0 od        N/A
0000000   lower frame cup chrome 30.0 od        N/A
0000000   lower cone (crown race) 27.0 id        N/A
JIS stands for Japan Industry Standards.
JIS crown races are 27.0 id, for a 27.1 fork.
JIS frame cups are 30.0, for a 29.9 frame.

 

Bicycle (ISO)  25.4 x 1.06 (1.00″- 24.0 tpi), 30.2 cups

Headset PartsJB-35495  EC30/26 Tange Levin sealed headset $30
0000000   upper frame cone black  30.2 od        N/A
0000000   lower frame cup chrome 30.2 od        N/A
0000000   lower cone (crown race) 26.35 id      
N/A
ISO stands for International Standards Organization. 
ISO cups are 30.2 mm o.d, for a 30.1 mm i.d frame.
ISO crown races are 26.4 id, for a fork crown 26.5 od.

Nuts and Washers:
A   0000000  thin lock nut, for spacing, 1″-24, oct     $2.00
B   JB-35705  Origin8 black open top nut, 1″-24, oct  $2.00
C   JB-3510    Wald 220 chrome open nut 1″-24, oct  $5.00
D   0000000  keyed thick washer 26x34x3                 $1.00
E   0000000  plain thin washer 26x32x1.5                 $1.50
F   0000000  plain thick washer 26x33x2.5                $2.00


Batavus headset, 1"-24 thread, 30.0 cups

Batavus headset, 1″-24 thread, 30.1 cups

Batavus  25.4 x 1.06 (1.00″- 24.0 tpi), 30.1 cups

Batavus mopeds are made in Holland.
1     47.043.00 partial headset #3-10               N/A
2     46.306.00 plastic plug for nut                     N/A
3     02.059.00 chrome open nut, original     $5-10  use bicycle

4     06.055.00 washer 26x34x1.5                      $3

5     47.043.04 adjustable cone chrome             N/A  use bicycle
6     47.043.03 upper frame cup, zinc 30.1 od  N/A use Peugeot
7+8 47.096.00 orig. retainer 14-5/32″ each       $8   
7+8 JB-1909   #73 retainer, 16-5/32″ each        $1.50
9     47.043.02 lower frame cup, zinc 30.1 od  N/A use Peugeot
10   47.043.01 fork cone (crown race) 26.5 id $12 use bicycle
11   46.117.00 spring strap/sleeve 1.0/0.35      N/A
The fork steering tube is a straight 25.5mm all the way down.
The strap crushes to 0.5 mm, so it adds up, 26.5 = 25.5 + 2*0.5.
The ideal spring strap for Batavus would be 0.5mm.


Trac headset, 1"-24, 30.0 & 30.2

Trac headset, 1″-24, 30.0 and 30.2 cups

Trac          25.4 x 1.06 (1.00″- 24.0 tpi), 30.2 cups

Trac mopeds are made in Korea by Kia and Dae Lim (DMC).
This example is for the early Tracs 1982-85 with M56 engines.
90305-M56-8900 chrome cap nut, orig. hex  N/A use bicycle

90503-M56-8900 washer 26 x 37 x 1            $3

4a 90304-M56-8900 notched thin nut               N/A use octag.
53211-M56-8900 adjustable cone chrome     N/A use bicycle
50301-M56-8900 upper cup chrome 30.2 od  N/A
96211-05000      upper balls, 26- 5/32″ #5  $2/26 or use #73 
96211-05000      lower balls, 26- 5/32″ #5  $2/26 or use #73 
50302-M56-8900 lower cup chrome 30.0 od  N/A
10 53212-M56-8900 cone (crown race) 25.5 id  N/A
This is the original crown race size, but it was loose on the fork.
The fork steering tube is a straight 25.4 mm all the way down.

The looseness had caused a 25.3 mm wear groove on the tube.
To be tight it needs a spring strap and a bigger race, like Batavus.


Cimatti set, 1"-24 thread, 30.2 cups

Cimatti headset, 1″-24 thread, 30.2 cups

Cimatti         25.4 x 1.06 (1.00″- 24.0 tpi), 30.2 cups

Cimatti’s are Italian, and use Italian headset standards.
Cups are 30.2, for a 30.1 frame. Same as bicycle.
3     18-00-51  chrome cap nut, 32 octagon        $20
4     18-01-18  plain washer, 26x30x1.5                $3
4a    xx-xx-xx  spacer tube, 26x29x9                   N/A
5     12-00-65  adjustable cup chrome                $12
6     12-00-62  upper frame cone, zinc   30.2 od    $8
7+8 10-00-39   orig. retainer 14-5/32″ each         $8 
7+8 JB-1909    #73 retainer, 16-5/32″ each         $1.50
9     12-00-63  lower frame cup chrome  30.2 od $20
10   12-00-64  fork cone (crown race)    26.5 id  $12
11
Italian crown race is 26.5 id, for a fork crown 26.6 od.
ISO (International Standards Org.) threads are 1″- 24 tpi.


Garelli headset, 1"-24 thread, 30.2 cups

Garelli headset, 1″-24 thread, 30.2 cups

Garelli          25.4 x 1.06 (1.00″- 24.0 tpi), 30.2 cups

Garelli’s are Italian, and use Italian headset standards.
1  507607.2100 complete original set #3-10       $65
1a    000.0000  set with chrome hexagonal nut   $45
2      206.3067  chrome open nut, 32 octagonal    $6
3      000.3086  chrome cap nut, 32 octagonal    $20
4      000.3085  plain washer, 26x30x1.5              $3
5      207.3078  adjustable cup chrome              $12
6      000.3062  upper frame cone zinc   30.2 od  $8
7+8  10-00-39  orig. retainer 14-5/32″ each         $8 
7+8  JB-1909   #73 retainer, 16-5/32″ each         $1.50
9      201.3064  lower frame cup chrome 30.2 od $20
10    000.3065  lower cone (crown race) 26.5 id  $12
One German-made moped, Kynast, uses this headset,
because Kynast (Flying Dutchman) has an Italian fork.


Vespa Ciao set, 1"- 24 thread, 30.2 cups

Vespa Ciao or Bravo, 1″- 24 tpi, 30.2 cups

Vespa Ciao/Bravo  25.4 x 1.06 (1″- 24 tpi), 30.2 cups

Vespa mopeds are made in Italy by Piaggio.
1       135977 partial original set #5-10              $50
3a     145608  chrome cap nut, 32 oct (Bravo)    $20
3       137609  chrome open nut, 32 oct (Ciao)    $20 use bicycle
4a     145607  locking plate, 32 octagon (Bravo)  N/A
5       136258  adjustable cup chrome decagon    $20
6       123315  upper frame cone zinc   30.2 od    $8
7+8 10-00-39  orig. retainer 14-5/32″ each         $8 
7+8 JB-1909   #73 retainer, 16-5/32″ each         $1.50
9       123316  lower frame cup chrome  30.2 od  $20
10     123317  lower cone (crown race)  26.5 id  $12
11   Vespa uses Italian headset standards, 26.5 and 30.2.
12


Schwinn set, 1"- 24 thread, 32.5 cups 1960's rechromed

Schwinn headset
1″- 24, 32.5 cups
1960’s re-chromed

1968 Schwinn Stingray equipped for BMX

1968 Schwinn
BMX equipped

Bicycle, Schwinn 25.4 x 1.06 (1″- 24 tpi), 32.5 cups

In the 50’s – 60’s USA this was a Schwinn-only head set size.In the late 1960’s BMX (bicycle moto cross) began. The first BMX bikes were 20″ kids bikes with off road tires, MX handlebars and seat. The Schwinn Stingray was preferred, because of it’s heavy duty construction and high quality. In the 70’s BMX equipment became Schwinn-compatible, including frames with 32.5 mm headset cups. BMX became very popular, as did the headset. In the 80’s it became the mountain bike (ATB) standard. In the 1990’s bigger 1-1/8″ steering tubes came out on high-end ATB’s, with 34.0 frame cups. Soon 34mm frames became the new ATB standard. Then bigger 1-1/4″ steering tubes and 37mm frames followed. Now this historic headset is almost obsolete.

BMX Headset, 1"-24 thread, 32.5 cups

BMX Headset, 1″-24 thread, 32.5 cups

This is a 1980’s-90’s BMX or ATB headset, 32.5 cups.
The cups fit Puch Magnum, Tomos and Sears Free Spirit.
1   JB-35334-0  EC32/26 Sunlite chrome headset $10
3   JB-35334-3  Sunlite chrome open nut, 32 hex   $5
4   JB-35334-4  keyed washer 26x34x1.5              $1
5   JB-35334-5  adjustable cone chrome               $3
6   JB-35334-6  upper frame cup chrome 32.5 od  $4
7   JB-35334-7  special retainer, 16-5/32″ each     $3
8   JB-35334-7  special retainer, 16-5/32″ each     $3
For 50 years these had #65 retainers, with 3/16″ balls.
9   JB-35334-9  lower frame cup chrome 32.5 od   $6
10 JB-35334-1  lower cone (crown race)  26.3 id   $5
This chrome crown race is labeled Ø26.4.
The fit, roundness and finish are surprisingly good.


AMF headset, 1″-24 thread, 33.6 cups

Bicycle, American 25.4 x 1.06 (1″- 24.0 tpi), 33.6 cups

1      MP-0014    AMF original headset #3-10        $40
1a   JB-3512       Wald 4080 headset 3a-10 below $15

3     MP-0014-1  chrome AMF open nut, hex         $18
3a   JB-3510       Wald #220 chrome nut, 32 oct     $5
4     MP-0014-1a tab/lock washer                        $2
4a   JB-3503       1 inch keyed washer                  $1
5     MP-0014-2   adjustable cone, zinc                $8
6+9  MP-0014-4  frame cup zinc, each  33.6 od   $15
6a+9a JB-3513    Wald #410 cup, each 33/34 od  $6
7+8  MP-0014-3  #52 retainer 15 – 3/16″, each     $5
10    MP-0014-5  lower cone (crown race) 25.5 id  $7
10a  JB-35345     lower cone (crown race) 26.4 id  $4

Wald headset, 1"-24, 30/33 cups

Wald headset, 1″-24, 32.9/34.3 cups

This standard is on AMF, Colombia mopeds and bicycles.
Also traditional American bicycles, Murray, Huffy, etc.
Wald 4080 headset is for traditional or vintage American.
The Wald 410 replacement frame cups have 3 “bumps”.
The diameter is 32.9 mm, but 34.3 mm at the bumps.
Grind them down to fit any frame from 32.8 to 34.2 mm.

Colombia Fork Crown Race

American Crown Race: Unlike other fork crowns that have a small step at the base of the steering tube, American type bicycles have a smooth flare. The race #10 only touches at the top of the flare, and at the bottom floor of the fork. You can see in the right photo the crown race is cone shaped inside. All other crown races are cylindrical shaped inside. 

If an American type conical crown race is not available, then a 26.4 mm id standard crown race will substitute (at least it did on this fork), thanks to the bottom having enough straight section that is 26.5 mm outer diameter. It sounds crazy that a 26.4 race will substitute for a 25.5 one. That is why this explanation and pictures are needed here.

 

 

 

26.0 x 1.00 mm thread

 


Puch Maxi set, 26 -1.0 thread, 30.8 cups

Puch Maxi   26.0 x 1.00 (1.02″- 25.4 tpi), 30.8 cups

The Puch Maxi headset is the same as Sachs (Hercules).
1   0000000000 partial headset #5-10    see treatland.tv
2   3491300181 chrome open nut                     $7-$15
3   3491305181 chrome cap nut                      $8-$20
4   0009013935 plain washer 26x32x2              
$3
5   6001330071 adjustable cone chrome            $3-$5
6+9 6002330051 frame cup, zinc each  30.8 od N/A  2.0 thin wall
7+8 0003298    orig. retainer 14-5/32″ each      $8 
7+8 JB-1909    #73 retainer, 16-5/32″ each      $1.50
10 6002330061 lower cone (crown race) 26.7 id $5-$8
11 3491300151 spring strap/sleeve 1.0/0.35 mm  N/A
Installed, the sleeve becomes 0.35 mm. So 26.7 = 26.0 + 2*0.35
These sizes are the traditional Austrian bicycle headset standard.
The 1984-86 Puch Cobra, was a “Magnum”, but it had this Maxi headset.


Sachs headset, 26-1.0 thread, 30.8 cups

Sachs/Hercules  26.0 x 1.00 (1.02″- 25.4 tpi), 30.8 cups

The Sachs headset is the same as a Puch Maxi headset.
1   5041009701 partial headset #5-10    see treatland.tv
2   9271013516 chrome open nut                     N/A  use Puch Maxi
3   9271013519 chrome cap nut                      N/A  use Puch Maxi
4   9279920817 plain washer 27x37x1.25        N/A

4a 9279919606  spacer ring 27x32x6           N/A
5   000000000 adjustable cone chrome          N/A  use Puch Maxi
6+9 00000000   frame cup, zinc each  30.8 od N/A  2.0 thin wall
7+8 00000000   orig. retainer 14-5/32″ each      $8 
7+8 JB-1909    #73 retainer, 16-5/32″ each      $1.50
10 000000000 lower cone (crown race) 26.7 id $5-$8
11 9219769501 spring strap/sleeve 1.0/0.35 thick N/A
Installed, the sleeve becomes 0.35 mm. So 26.7 = 26.0 + 2*0.35
These sizes are the traditional Austrian bicycle headset standard.


Sparta, KTM 26x1.0 32.0 cups

Sparta, KTM,  26-1.0 thread, 32.0 cups

Sparta/KTM   26.0 x 1.00 (1.02″- 25.4 tpi), 32.0 cups

1     00000000  complete headset #3-10            $35
2     335.01.01  chrome cap nut (Kreidler & KTM)  $8-$18
3     00000000  chrome cap-lug nut (for Sparta) $10-$20
This nut bottom is cone shaped, for centering, like a lug nut.
4     235.01.10  plain washer (for Kreidler & KTM)  $2
5     00000000  adjustable cup, bright zinc          $5-$8
6     235.01.02  adjustable cup chrome (Kreidler) $15
6     00000000  upper frame cone, zinc   32.0 od  $5-$8
7+8 JB-1908    #65 retainer, 15 – 3/16″ each      $2
7+8 00.69.27    22 – 3/16″ balls (Kreidler) each    $2/26
9     00000000  lower frame cup zinc    32.0 od   $5-$8
10   00000000  lower cone (crown race) 26.7 id  $5-$8
New crown races range from 26.65 to 26.74 mm id.


Puch Magnum set, 26-1.0 thread, 32.6 cups

Puch Magnum set, 26-1.0 thread, 32.6 cups

Puch Magnum   26.0 x 1.00 (1.02″- 25.4 tpi), 32.6 cups

Puch Magnum MkII, Sears Free Spirit 8084, 8085, 8086 silver:
3a 3211308181 chrome cap nut (zinc on Sears)  N/A
4b 3211308191 washer 29x35x.75             N/A  above plate
4a 3211308511 spacer 26x32x13.5             $8  below plate
Magnum XK, Sears Free Spirit 8080 blue, 8081,8082,8083 red:
3   3491305181 chrome cap nut                 $8-$20
4        9013935  washer 26x32x2.5              $3 below plate
All Puch Magnums (except Cobra) and Sears Free Spirits:
5   3211307081 adjustable cone zinc 51 od    $15-$20
6+9  25221  frame cup, zinc, each  32.6 od    $25  3.3 thick wall
7+8  25226  loose balls 5mm qty 21 each        $5/21 or use 3/16
10    25220  lower cone (crown race) 26.7 id   $5-$8
11    00000  early Schwinn cup, chrome 32.5  $12  2.0 thin wall
12    02016  Sears Free Spirit cup, zinc  32.6   $15  2.8 thick wall
13    00000  Schwinn/BMX cup, chrome 32.7   $20  2.6 thick wall


Tomos A3 and A35, 26-1.0 thread, 32.6 cups

Tomos 1975-2006  26.0 x 1.0 (1.02″-25.4 tpi) 32.6 cups

Tomos made Puchs, under license, from 1955 to 1974. 
That is why the steering parts also fit Puch Magnum.
3        200718  chrome open nut 32 hex           $8-$12
3a      219349  chrome cap nut 32 hex             $8-$15
4        206701  plain washer 26x36x1.5            $3
5a      200717  notched adjustment nut            $5
5b      200715  dust shield 26x47x9mm             $5
5c      200714  upper cone, no threads 26.0 id   $8
6       200558  upper frame cup, zinc  32.6 od $15  2.6 thick wall
7       044535  upper balls 5mm qty 21            $5
8       044535  lower balls 5mm qty 21            $5
9       200471  lower frame cup, zinc   32.6 od $20  2.6 thick wall
10     200714  lower cone (crown race)  26.0 id $8
11
The 1987-06 Tomos fork has M26-1.0 rolled threads 25.8 od, then smooth 25.1 od, flaring to 26.1 at arrow.
The 1975-86 Tomos fork has M26-1.0  cut  threads 25.8 od, then smooth 26.0 od, flaring to 26.1 at arrow.


Tomos A55 headset, 26-1.0 thread, 32.5 cups

Tomos 2007-2013  26.0 x 1.0 (1.02″-25.4 tpi) 32.5 cups

1        230741  partial headset #4-11               $50
The 2007-12 Parts Catalogs only have the older fork items.
So the 07-on EBR fork items, 10 and 11, are not available.
3       219349  chrome cap nut 32 hex               $8-$15
4       222848  chrome washer 26x36x2             $3
5a     200717  notched adjustment nut              $5
5b     200715  dust shield 26x47x9mm                $5
5c     200714  upper cone, no threads  26.0 id    $8
6      223155  upper frame cup, zinc   32.5 od   $15  2.6 thick wall
7      044535  upper balls 5mm qty 21               $5
8      044535  lower balls 5mm qty 21               $5
9      223157  lower frame cup, zinc   32.5 od   $18  2.6 thick wall
10     00000  lower cone (crown race)  27.4 id  N/A use 26.7-27.0
11     00000  spring strap/sleeve 1.0/0.4 thick   N/A
The strap crushes down from 1.0 to 0.7 when installed.
So 27.4 = 26.0 + 2*0.7. Ideal strap is 0.7mm thick.

The 2007-13 Tomos fork has M26-1.0 cut threads 25.8 od, then smooth 26.0 od, with no flare.
Instead of a flare or step, it has a #11 spring strap, the same one that a Puch Maxi has.

 

 

28.0 x 1.00 mm thread

 


Vespa Si          28.0 x 1.00 (1.10″- 25.4 tpi)  41.2 cups

This futuristic early 1980’s moped has a bigger steering tube and bearings.
This size was also for an old French tandem, according to http://sheldonbrown.com/cribsheet-headsets.html

3      212152  chrome cap nut 36 oct               $20
4      000000
5      000000
6      000000  upper frame cup, zinc   41.2 od   $15  4.0 thick wall
7      000000  upper balls
8      000000  lower balls
9      000000  lower frame cup, zinc    41.2 od   N/A  4.0 thick wall
10     000000  lower cone (crown race)

 

28.6 x 0.98 mm thread

 


Bicycle (1-1/8″)  28.6 x 0.98 (1.125″- 26 tpi)  34.0 cups

EC34/30. This (1.125″) was the first oversize for 1990’s mountain bikes (ATB), 34.0 cups, 30.0 crown race.

 

 

31.8 x 0.98 thread

 


Bicycle (1-1/4″)  31.8 x 0.98 (1.25″- 26 tpi)  37.0 cups

EC37/33. This (1.25 inch) is the biggest external cup (EC) threaded bicycle headset, 37.0 cups, 33.0 crown race.