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02-13-09 | 08:06 AM

#1

daveed

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Joined: Oct 2004

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Bikes: Soma Double Cross, ‘79 Centurian Mixte, generic mountain bikes (Nasbar frames)

Question for biopace buffs

I'm running a Shimano R100 crank and a 42t biopace chainring (130 bcd) on my fixie. The set up suits me fine except for one thing: the crank arm won't accept other 130 bcd chainrings. When I tried putting on a Sugino, for example, it wouldn't quite fit.

Is there a reason for this?

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