i thought of doing this as well but i just don’t know how consistent the transfer of power would be. i could see it slipping if it got any kind of water between the 2 wheels.
i was thinking of mounting the hub scooter motor around the area behind the bike seat. or somewhere out of the way of the crank shaft and pedals. i think it would be possible to rig some kind of rubber belt to a gear then run a chain from the gear to the wheel.
i’m struggling putting thought to words but ill try
mount the hub motor to frame. mount a free spinning axle with a gear on one side of the axle. run a tight belt from the axle to the hub motor, then run a chain from the axle/gear to the back wheel.
this would allow you to still use the rear gears and i think produce more consistent power to wheel
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