Originally Posted by 55/Rad
Going from a triple to a double on a MTB. Square taper UN53 BB and Bulletproof crank. There are 2 choices - 107 and 110 - how do I determine which is right for this application?
55/Rad
My guess would be 110mm. Your mountain bike is likely to have a 135mm rear dropout spread. The wider bottom bracket will give you a slightly better chainline.