Tech Question..................
I have a dura-ace 9spd groupset fitted to my 2011 Trek Madone 4.7 frame. 12,13,14,15,16,17,19,21,23 cassette. When in the wee ring (39/53T), The chain rubs on big ring from maybe the 15 downwards, meaning my octalink bb spindle maybe isn't long enough? Does anyone...