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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-26-06, 06:41 PM   #1
bluenote157
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french bottom bracket compatibility issues once more...

So as mentioned in previous posts, I have an older french bike with cottered cranks. I've determined the following... The bb is 68mm french thread(and not swiss) and not made in japan(so the walls are thin). I found the following spindles in my box of stuff... campy 70ss, 68 something, and an older dura ace. Anyone know which one will work the best? Also, are all square tapered heads the same?

Thanks,
kevin
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Old 09-26-06, 08:56 PM   #2
moxfyre
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Can't help you with the spindle selection I'm afraid, but I can tell you that NOT all square tapers are the same. There are at least four kinds:

* Campagnolo taper
* JIS taper - any square-taper BB made today other than Campy (Shimano, Sugino, Sanshin, Sakae, Truvativ, everyone else and their mom)
* Ofmega taper (not compatible with anything other than Ofmega cranks + BBs )
* weird old French taper (sorry, I don't know much else about it, but some French bikes use a normal JIS taper)

Here's an informative thread about using Campy BBs with JIS cranks and vice versa: http://groups.google.com/group/rec.b...c08716cbc6917e
Basically Sheldon Brown and Jobst Brandt (the experts) argue that, although it's not a perfect fit, the two can generally be mixed and matched safely, while some other people (not experts) share horror stories of mismatched cranks and BBs which cracked or wobbled loose
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