Ok, so I've decided to redo my bike project. I want to do an external motor and use gearing advantage (even though motors are efficient, it seems like a lot of these motors peak out in RPM and energy is wasted in torque). But my question is, I see some of the higher powered bikes here using AC motors. It would seem to me that it's a waste of energy to invert DC batteries into AC (10-15% loss) just so I can run an AC motor. Is there some torque advantage of using an AC motor that makes up for it?