Bearing and Seal Chart

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Sizes are given in millimeters.

Some general info on ball bearing nomenclature (go to the 3rd page). Nomenclature (and part #s) may differ slightly between manufacturers/vendors: Action Bearing Nomenclature

Also general technical info on bearings (types, failure modes, etc.): Bearing Tech Info

How ball bearings are made!
How ball bearings are made VIDEO!

ISO bearings: ISO
FAG bearings: FAG

If you have trouble finding some bearings and seals on Treats/Mopedjunkyard/etc, you may have better luck with a local bearing shop. Often they can source weird sized bearings and seals and generally will be cheaper too!

Puch E50

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 Left Crankshaft, Main Gear 3 C3 clearance
6203 NR 17 40 12 Right crankshaft 1 External Snap ring

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
Double lip 17 40 7 Crankshaft Seals 2
Double lip 22 40 7 Output shaft seal 1


Puch ZA50

Bearings

ID Inner Diameter Outer Diameter Width Usage Notes
L17 (FAG) 17 40 10 ZA50 magneto side crank bearings
E20 (FAG) 20 47 12 ZA50 transmission side crank bearing
6002 (ISO) 15 32 9 ZA50 transmission cover crank side
16101 (ISO) 12 30 8 ZA50 transmission cover intermediate side - oil injected
16100 (ISO) 10 28 8 ZA50 transmission cover intermediate side - non oil injected
6005 (ISO) 25 47 12 ZA50 intermediate shaft main
6203 (ISO) 17 40 12 ZA50 output shaft main
HK 1816 (FAG) 18 24 16 ZA50 output shaft roller
HK 1612 (FAG) 16 22 12 ZA50 second speed gear internals

Seals

ID Inner Diameter Outer Diameter Width Usage Notes
17 35 7 ZA50 magneto side crank seal
20 35 7 ZA50 transmission side crank seal
25 35 7 ZA50 Output shaft seal


Sachs 50x

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6202 15 35 11 Left Crankshaft, Main Gear 1
6202 15 35 11 Right crankshaft 1

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
15 30 5,5 Clutch side crank seal 1
15 35 7 Magneto side crank seal 1
15 32 5,5 Output shaft seal 1


Tomos A3

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
L17a 17 40 10 Crankshaft Bearing 2 Early Style
6203 C3 17 40 12 Crankshaft Bearing 2 Late Style
6000 10 26 8 Side-cover Bearing 2 Outer Crank and Gear shaft support
6201 12 32 10 Transmision bearing 1 Inner gear shaft support
6006 30 55 13 Mainshaft Bearing 1
SCE 109P 5/8th inch 13/16th inch 9/16th inch Mainshaft roller 1 Has seal on 1 end
SCE 108 5/8th inch 13/16th inch 1/2 inch Mainshaft roller 1
RC081208 13 19 12.5 Clutch one-way needle bearing 1 Treats, mopedjunkyard, and Myrons have it

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
Lipped seal 17 35 8 Crankshaft seals 2
Lipped Seal (metal lined?) 16 24 7 Right cover pedal shaft 1


Tomos A35/A55

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 Crank main bearings 2 C3 clearance
608 8 22 7 Trans Cover Crank support 1
6000 10 26 8 Trans cover Counter shaft support 1
6201 12 32 10 Left Counter shaft support 1
6006 30 55 13 Driveshaft bearing 1
Needle Roller 12 15 15 Small end connecting rod 1
One way needle bearing Clutch Bell 1
Roller d5 8 Counter shaft gear 1
SCE 109P Driveshaft bearing 1 Needle roller
SCE 108 Driveshaft bearing 1 Needle roller

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
Lipped seal 17 35 7 or 8 Crankshaft seals 2
Lipped seal 35 47 7 Output shaft seal 1
Lipped seal 16 24 7 Transmission cover pedal shaft seal 1


Motobecane AV7/AV10

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
533526 TNH 16 42 13 Crankshaft bearings 2 Special tapered ID
15 19 22 Clutch bearing 1
Variator balls 3 or 4 17/32" or 13,49mm
HK1612 16 22 12 Pulley bearings 2
Steering bearings 50 5/32" or 3,96mm

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
SC 15x21x4 15 21 4 Crankshaft Seals 2


Peugeot 103

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 TN9/C3 17 40 12 Unsealed - Magneto Side 1 TN9/C3
6204 TN9/C3 20 47 14 Unsealed - Variator Side 1 TN9/C3

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
Lipped Seal 16 30 4.5 Magneto Side 1
Lipped Seal 20 30 4.5 Variator Side 1


Batavus M48

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6302 15 42 13 Magneto side crank bearing 1
6302 15 42 13 Transmission side crank bearing 1

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
30 15 7 Magneto side crank seal 1
42 20 7 Clutch side crank seal 1


Batavus (Trac) M56

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6202 C3 15 35 11 Crankshaft bearings 2
6202 15 35 11 Drive shaft (pulley side) 1
6203 17 40 12 Ratcheting Shaft 1

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
5830 15 32 7 Crankshaft (magneto side) 1 Same as output shaft seal of Sachs 504/505
8305 21 32 7 Crankshaft (pulley side) 1
7854 20 26 4 Ratcheting shaft (pedal side) 1
6640 17 35 7 Ratcheting shaft (drive chain side) 1
564044 30 15 5 Drive shaft (pulley side) 1


Honda PAI / PAII

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6004 C3 20 42 12 Crank bearings 2

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
15 25.5 7 Crankshaft Seals 2 This is for stock crank. Aftermarket typically uses one 17 x 25.5 x 7 and one 15 x 25.5 x 7 seal.


Garelli NOI

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 4

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
17 30 7 Engine seals 3
16 20 2.5 Pedal shaft seals 2


Minarelli V1

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 2
6202 C3 15 35 11 2

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
15 24 5 3
17 35 7 2


Morini M1/M01

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 2
6202 C3 15 35 11 2

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
15 24 5 1
16 24 5 2
17 35 7 2


Morini M02

Bearings

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
6203 C3 17 40 12 1
6202 C3 15 35 11 1
6004 C3 20 42 12 1
6001 C3 20 42 12 Trans cover bearing 1 Not all M02 have this (apparently)

Seals

ID Inner Diameter Outer Diameter Width Usage Quantity Notes
16 24 5 2
15 24 5 1
20 35 7 1
17 35 7 1