Well I was brainstorming ways of getting more speed and torque out of the gas bike (Gearing), i was thinking of ways to accomplish this, and a solution i have found is this. To basically use the existing bicycle drive train and derailleur to be able to shift the power from the motor. Below is a small diagram of how it would function. -Remove crank arms and pedals -Weld sprocket to pedal bearing -set chain tensionier to keep chain from rubbing on the motor's exterior -Test out the new derailer system -Hope fully the stock bike chain and rear hub will be able to withstand the torque from the motor -Maybe buying a heavy duty DH bike chain would help, as well as a good quality rear hub / wheel. what do you guys think? I will also have to lock the rear HUB, as the bike would need to be roll started but this would not work with the ratchet systems rear hubs use Unless i leave one crank arm on to start it, but not having it on permentally, kind of like a key lol, keep it in my bag or something Apon further research, this appears to be simmilar to a "JackShaft", except i dont need pedal power, who needs that lol?