So, i have been riding my motor bike to work monday and tuesday. but on the way home on yesterday the chain slipped of the pulley system and pulled the pulley lever and chain into the spokes of my back wheel and doing so broke 3 spokes, which destroyed the back wheel by bending the crap out of it. now, the chain was a little loose, which may have caused this to happen. i fixed the problem by getting a different back wheel that i had from another bike that i had. my question to you guys is do they make a better pulley's than the one i got with my thatsdax engine kit? maybe one that is made out of some kind of metal and that has higher sidings to prevent the chain from slipping off? thanks for your help!!