Trek madone 4.7 / Dura Ace 9spd octalink BB not long enough?

[Ticketty Boo!]

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 know if these are available in different lengths?

 

[jimo746]

Re: Trek madone 4.7 / Dura Ace 9spd octalink BB not long eno

I think you maybe meant to post this in the Road bike section?

However, I have a similar issue with a Sram GXP bottom bracket :? I'm guessing the chainline is not quite right, although I've not actually bothered to check it yet

afaik you can get different length Octalink bottom brackets, as it's essentially like the traditional/retro square taper ones, just with the splined "octalink/isis" connection between axle and crank.

If you have some floating around then maybe try putting a couple of spacers between the small ring and crank spider, see if that gives you a bit of room to play with, otherwise I'd be measuring the chainline and finding a bottom bracket with the axle for optimum chainline.