Subject: Re: Chain Rign Compatibililty Posted by: Jim on December 11, 2003 at 09:46:14: In Reply to: Re: Chain Rign Compatibililty posted by Robert on December 11, 2003 at 08:35:08:

Message: >>Can an Ultegra triple chain ring set be used on a Dura-Ace triple crankset? There doesn't seem to be a 30-42-52 or 53 Dura-Ace chain ring set, and I don't like the 30-39-53 Dura-Ace standard. > >You can use the 42T and 52T as both Ultegra and Dura-ace are 130mm BCD for the two larger rings. But the 30T won't work. As Al pointed out, the inner ring on the Ultegra is 74mm BCD while the Dura-ace is 92mm BCD. .............actually, even tho the DA triple arms are 130 like the ultegras, aren't the arms specially machined to accept only the DA triple rings? A case of all 130 BCD rings not being the same?