Hey Strati did you have to buy a new chain for this setup to work? I have the 14t I love it, but I am starting to want a little more snap.yep... that's right nick. i went from the 15/37 -> 15/39 first.
really liked the results of just two more teeth in back. low-speed lugging was easier with less clutch play and accelleration was more brisk. i'm not a top-speed junkie so i can't comment to top end loss.
then within a week i got greedy... went to the 14/39 setup i currently have.