Something to consider when choosing between hub motors and frame mounted motors is the very large difference in axle torque.
With a hub motor the rated torque is also the axle torque. With a frame mounted motor the motor torque is multiplied by the gear reduction ratio which is generally 3 to 5 times.
A 100 Nm hub motor puts 100 Nm to the rear axle. A 100 Nm mid-drive motor puts 300 to 500 Nm to the rear axle.
That is why bicycles and motorcycles with hub motors are generally much slower to accelerate than a vehicle with the same size frame mounted motor.
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