The design of the system is with two bearings, three stage speed reducer.  The better is speed down ratio is high and at the mean time the space size is reduced, thereby it can be reduced the accumulation of error( the accumulation of the error among multi-axis center distance), and it becomes easier assembled of reduction rear-box. The speed down ratio is about 1:22 in normal motor, this Mid-Torque Sensor Motor can be reached about 1:34, rise 50%, so the efficiency is greatly enhanced, and the output torque rise 50%.  So the start response is much quicker, the pedal power response is much better and the climbing ability is much stronger.