Shimano and every bike shop says it can't/shouldn't be done. I have a
39/56 on my Cervelo. Looked for a 42 or 44 but don't want to pay full retail for one. Mine shifts
very well up, but sometimes downshifting it doesn't engage completely for a 1/4 to 1/2
revolution.
TriRod IMC 2002 IMUSA CdA 2003
Jim Quinn wrote:
> Does the Dura Ace 56T time trial chainring have to be matched with a similar small chainring or
> can it be used with a standard 42 or 39 chainring?