This motor is perfect for medium to large size electric motorcycles. With its extra long body compared to the 70h model you will be able to achieve a higher torque and power. This motor is capable of over 35kW Bursts!  Includes 1- QS 138 4kW Mid drive motor (tapered shaft with key) with 14T 428 sprocket Key Features  Light weight and small dimension compared to other motors of similar power outputs V configured rotor design allows for higher RPM with flux weakening High Torque suitable for high performance high load situations such as climbing and racing. Supports regenerative braking Proven reliability Compatibility EM-150 Controller EM-200 Controller EM-260 Controller Specification (via QS) Motor Type: BLDC IPM Brand: QS Motor, QSMOTOR Motor Design: Single Axle Matched Tire: 17 inch Magnet Height: 90mm, 5 pole pairs Rated Power: 7500W Peak Power: 13.5kW Rated Voltage: 72V Speed: 4000RPM With Flux Weakening(RPM): 6500RPM Rated Torque: 14.3N.m Max Torque: 72.N.m Cooling Method: Air Cooling Max Efficiency: 94% Continuous Battery Current: 89A Peak Battery Current: 200A Thermic Probe: KTY83/122 (as default) Working Temperature: 70-120C, peak 150C Hall Sensor: Single Hall Set with Waterproof Connectors Phase Wire: 20mm2 Cross Section (not include insulation layer) Waterproof Grade: IP67 Color: Black N.W./G.W.: approx. 13kgs/14kgs Package Dimensions: 34cmx34cmx33cm/piece E&C Findings Based on our testing we have come up with some alternative ratings. These ratings are strictly our opinion and warranty will not be provided beyond QS recommended ratings. Details Max Battery Current: 300 amps Max Output: 22,000w or 22kw