The one I was using is the Flying Horse garbage from BikeBerry...worst thing I could have put on there! The bell housing completely broke off from the input shaft while I was riding home from work. Thankfully, I was already near my apartment when it decided to snap off. With that said, I would like to know if anyone has any ideas of where I can get a better transmission for it. I have already looked on gasbike.net with no luck. All of the options I found on there are sold out. Before going any further with my search, I would greatly appreciate any information on the subject prior to buying another one just for it to do the same thing again in 2-3 months....