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Hi on my race bile I always use a triple, I can then use a 12-21 on the back - no missed gears. I have the ration 52 (12/13/14/15/16/17/18) 39 (12/13/14/15/16/17/18/19) 30 (15/16/17/18/19/20/21) - I prefer a slightly longer chain so the 30 kicks in at 15! Winter training is on a 52/39 to get strength. PS I use a dura ace triple and find it excellent ! |