Wait so just to clarify, if i wanted to motorize a three speed, I would need a chain tensioner? I couldn't just put on a motor, it wouldn't be as simple as that? I'm a little confused at all of these answers, please dumb down your esoteric language by about 10%. I am looking to motorize a three speed beach cruiser, besides new brakes, the motor kit, and the bike, what EXACTLY do I need?