I am wondering what is the difference between this motor and other geared hub motors. I've read that it has metal gears as opposed to nylon, but I have found little more information regarding this. If my motor stops functioning can I buy a das-kit somewhere else or replace the gears with those of a Bafang? I'm just curious as to what information anyone has in regard to these motors. I have an NCM aspen and so far I love it, but I am concerned that if it quits functioning (motor) then I wan't have a way to power the bike as leoncycle.com doesn't sell motors except in kits for smaller rimmed bikes. I guess I could take the motor off of the wheel and use it on mine and have it respoked if the need should arise.