Thread: Replacing Biopace chainrings
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Old 04-18-20 | 11:46 AM
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52telecaster
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From: Peoria Il

Bikes: Austro Daimler modified by Gugie! Raleigh Professional and lots of other bikes.

The percentage change is what is important. Us you can go to 38 on a 130 bcd if you can find one. 42 to 39 is about 7 to 8 percent change a 38 would be 10. Its about a half step lower in terms of touring gears.
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