Has anyone already customized, or plan to customize, your bicycle by putting an electric motor on it? I'm researching how I can weld a flat hub motor in the middle of my mountain bike. I want to weld two sprockets (1 small, and 1 large) to the end of the drive shaft, and run the chain from the back wheel to the sprockets on the motor, instead of the pedals. the smaller sprocket would be for hill-climbing, and the larger for high speed on flat surfaces. And it has to have variable speed control.