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Ball Bearing Sizes

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Ball Bearing Sizes

Old 04-01-14, 05:23 PM
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Ball Bearing Sizes

I was going to purchase bearings soon and i was wondering about some different sizes.

I have one of those park tool rulers with the ball bearing size on it and so far i've determined:

- 1/4 = rear hub ball bearings for shimano and other brands or bottom bracket race bearings

- 3/16 = Front hub bearing for shimano and some other brands

the next few i haven't figured out what they're used for, hopefully you guys can fill in the blanks

1) 7/32 ?
2) 5/32 ? (headset bearing?)
3) 1/8 ?
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Old 04-01-14, 05:36 PM
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7/32 for Campy front hubs (many)
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Old 04-01-14, 06:12 PM
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5/32" most pedals
1/8" most of the hubs I have used
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Old 04-01-14, 06:22 PM
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5/32 for headsets.
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Old 04-01-14, 06:39 PM
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1/8" for freewheels, and freehub bodies that don't use a cartridge bearing.
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Old 04-01-14, 09:10 PM
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Originally Posted by mapleleafs-13
1) 7/32 ?
Vintage Campagnolo "Record" front hubs, Zeus 2000 titanium bottom brackets.

2) 5/32 ? (headset bearing?)
Many pedals, some headsets (e.g. Campagnolo Record track and Gran Sport road, many Japanese and French headsets), Helicomatic rear hubs.

3) 1/8 ?
Freewheels. Some pedals.

3/16: many front hubs, including Campagnolo Tipo, Triomphe, Victory. Vintage Campagnolo Super Record titanium bottom brackets and C-Record bottom brackets. Also some obscure 1960s Campagnolo Record bottom brackets marked "CON SFERE DA 3/16" Some high-end headsets like Campagnolo Record and Super Record, Shimano Dura-Ace and 600, etc.

Last edited by JohnDThompson; 04-01-14 at 09:15 PM.
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