Thread: Bio-Pace Question
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Old 09-21-14 | 04:07 PM
  #16  
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JohnDThompson
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Originally Posted by FBinNY
If I remember correctly (which isn't assured) Bio-pace mtb cranks used classic 110/74 BCD.
Correct.

If so, the minimum size rings are 24 and 34t (maybe 33t) respectively. But that's for round. The shape of a Bio-pace would increase the minimum size somewhat, but don't ask me how much -- it was a long time ago.
IIRC, 28T was the smallest Biopace ring offered. But there's no reason why the OP couldn't use a smaller, round 74mm BCD ring instead.
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