4000W Mid Drive Motor (Sprocket Wheel or Pulley) Motor Brand: QS Motor, QSMOTOR, Customized Brand. Motor Type: DC Brushless Permanent Magnet Motor Motor Design: Mid Drive with Single Axle Magnet: strong V magnet 90H. Power: 4000W (maximum 14KW, sometimes can reach 20KW). Rated Voltage: 72V Rotating: maximum 7000rpm Maximum Speed: 90km/h to 120km/h. Maximum Torque: 60N.m to 80N.m. Maxim Efficiency: 91% Waterproof Grade: IP54 Color: Black