The mid drive motor refers to the motor that the driving motor of the electric assisted bicycle is installed in the middle position of the vehicle body, that is, the pedal position. The motor is connected with the vehicle body and connected with the rear wheel through a chain to transmit power. At the same time, pedals are installed on both sides of the motor. Under the condition that the motor has no power supply, the rider can ride the bicycle manually through the pedals.We use bafang bbs02 750W mid drive motor kit and the speed can reach 40-42 KM/H.