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Gear Question

i have an ultegra compact and want to...

Posted on

i have an ultegra compact and want to change to double, do i have to change the bb? is it possible to buy the rings only?

Responded on

If what you want to do is put a 53X39 on you compact crank, it is not possible because compact crank chain rings radius is 110mm whlie the double is 130mm. The BB works the same.