Originally Posted by Dendrite
I am looking into replacing my Ultegra 53/39 with an FSA 50/34. For this I will need to change out the BB as well. The Ultegra BB is 109.5mm and the FSA BB is only available in 108, 113, and 118mm sizes. Does it make a difference if the new one is slightly longer/shorter?
I have an FSA Energy 50/34 crank octalink. It bolted right up to my 109.5 Utegra bottom bracket so the only thing that I had to buy was the crankset.