QS138 3000W V3 5500W Max continuous 72V 110kmh 115 KPH IPM with 1:2.37 gear box Mid drive Motor conversion kit with EM150-2SP Controller. For138 motor powertrain kits, it could be used for electriclight motorcycle, which could be 72V100KPH. E-motorcycle weight, approx 128kg+280kg. Gear ratio: 1:3 (single steps transmission). QS138-C 3000W Mid Drive Motor (1:2.36 reduction gear box inside). 1 Motor Brand: QS Motor. 2 Motor Type: 138 BLDC Permanent Magnet Motor, PMSM. 3 Motor Design: Mid Drive with Single Axle. 4 Motor Shaft: Spline Shaft. 5 Magnet: strong V magnet 70H. 6 Diameter of Motor: 162mm. 7 Length of Motor: 231mm. 9 Recommended Work Voltage: DC 72V. 10 Rotating: maximum 1900rpm – 2500rpm (after reduction). 11 Maximum Speed: 80km/h to 100km/h. 13 Maximum Torque: more than 120N. 14 Maximum Efficiency: 92%. 15 Waterproof Grade: IP54. 16 Net Weight: 12.3kgs (27 lbs). The 19:45 reduction gear box inside, much easily for double step transmission with better acceleration. We will be appreciated of that you leave us a 5 star feedback if you are satisfied with our goods. We will do our best service to help you.