Thread: how to measure bolt circle on chain ring?
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Old 02-26-06 | 06:28 PM
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highpants
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From: minneapolis

Bikes: iro mark v 48x16 or 15 i think (fixed), surly 1x1 32x16 (free)

i get 136 when i follow that formula, but i'm not sure if that makes any sense.
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