Any problems reported with Disk brakes?
Disk brakes put a lot of stress on spokes, addition of engine doubles the stress, maintenance might get expensive. Some disk brakes only require the lower mount strap be spaced out with a nut/washer for proper mounting – Others find they have to grind a 1/4″ wedge from the lower strap to clear the brake, still others require Serious modification of the mount and would not be recommended. Installation instructions on the ‘How To’ page of this website are very helpful in answering this issue.