Howdy all, I'm swapping out my Campy compact (34/50-12/27) for a standard (39/53-11/23) drivetrain. The chain has about 1000 miles on it and has stretched a bit so I'm going to get a new one to go with the new cassette, but I was wondering if I'll need new set of BB cups to go with the new crankset. They're cheap enough to replace but is it necessary?
