I have a hybrid that has a mountain crank 44/26 and I want more top end. I just realized that I might score an 8 speed crank with square taper at the swap meet in Westminster, MD this Sunday. It's a great meet and not that far from Philly, I recommend it.bikephilly said:Are you upgrading to 9 speed or just swapping out the crank? If you are just swapping out the crank, you don't need to do anything. It will work fine.
Replace the chain only if it's worn (12 lengths of chain should be very close to 12 inches). If the number of teeth remain the same in the old and new crankset, you won't need to adjust the length of the chain. If you are upgrading to 9 speed, you will need 9 speed everything but the front derailleur (and cranks, but you are already getting them).