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Bottom Bracket bearing size?

Old 06-11-05, 10:18 PM
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Mouton
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Bottom Bracket bearing size?

I just found a square taper Shimano NJS bottom bracket today at a garage sale (thanks Judah!) The BB didnt come with bearings and so I ask you: Is there a standard for this sort of thing? 1/4"? All the rest of the measurements are in metric (68mmx107mm)so it seems weird that it would be imperial. Anyways thanx.
-alex
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Old 06-11-05, 10:26 PM
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99.99% chance that they're 1/4" AFAIK, there's no such thing as metric loose ball bearings on bikes. It's just one of those things that never got metricised.
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Old 06-11-05, 10:35 PM
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cool thanks. There are usually 11 bearings per side in a BB? that seems high.
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Old 06-11-05, 10:37 PM
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My Dura Ace hubs use 9, 1/4 bearings on each side.
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Old 06-11-05, 10:40 PM
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Originally Posted by Mouton
cool thanks. There are usually 11 bearings per side in a BB? that seems high.
General rule is a full race minus one. It's been too long since I repacked a loose bearing BB to comment on exact numbers
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Old 06-11-05, 10:41 PM
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Originally Posted by jgsjr
My Dura Ace hubs use 9, 1/4 bearings on each side.
He's asking about a BB.
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Old 06-11-05, 11:09 PM
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Well, a Dura Ace hub is metric like his BB and it uses 1/4 bearings.......
The Dura Ace hub uses 9 bearings on each side and it is a bit smaller than a BB race so 11 bearings do not seem excessive.

I think it is pretty relevant
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Old 06-11-05, 11:34 PM
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good point.
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Old 06-12-05, 11:52 PM
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For the record:

11 25-grade 1/4" bearings on each side. Piece. Of. Cake.
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