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Old 09-26-13 | 06:53 PM
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HillRider
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Joined: Aug 2005
Posts: 33,657
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From: Pittsburgh, PA

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

BCD means "bolt circle diameter", the diameter of the circle the bolts that fasten the chainrings to the arms lie on. No, you cannot fit 130 mm bcd chainrings to a 110 mm bcd crank. The bolts will not line up properly. There are 110 mm bcd chainrings available in 53 and 39T form but they aren't cheap. I believe TA Specialities offers them.

It might be less expensive to buy a complete "standard" double crank with the chainrings you want instead of buying replacement rings for your current compact crank.
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