![]() ![]() Record, Chorus, Athena, Daytona and Centaur 89 and 10 speed silver inner rings are identical. ![]() Then multiply by two and you will have the diameter of the bolt circle. To calculate BCD, measure from the center of any chain ring bolt to the center of the bottom bracket spindle, mounting hole. Oh and BTW The 42AS does not have the diamond alignment indicator.Īll Campagnolo cranks from 1990 to present use a 135 mm, bolt circle diameter, chain ring. Im guessing that I pulled the inner 42 off of an earlier Chorus crankset. So I know which one is a chorus or record, but what are the little rivets on the side are they only on exa-drive chainrings What smaller ring is matched with say a 53-AS Any help explaining these markings and details, and how they may relate to an exa-drive is appreciated. On some chainrings there are chainstop pegs, a record version is in line with a hole and the chorus one is between the holes. ![]() What does the AS stand for And some have a diamond marking with the letter c or letter e inscribed inside. Also, Ive run into designations and markings on Campagnolo chainrings that I dont know what they are.Įxample, some chainrings have the markings 5339, some 53-AS, others -39- or 42-AS.
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