1、PARAMETERS: The torsion(N.M) of this electric bicycle hub motor is 85N.M, rated voltage is 48V, rated power is 750W, rated speed is about 35‑40km/h. 2、USAGE: Electric bicycle hub motor can provide you with superb riding ability and easily convert your bicycle into an electric bicycle. You can ride on the highway or climb mountains faster and easier. 3、ALUMINUM ALLOY MATERIAL: The electric wheel hub motor is made of premium aluminum alloy with fine processing and manufacturing, which effectively strengthens the edge, light weight and excellent performance. It has strong carrying capacity and comfort. 4、EASY MAINTENANCE AND MODIFICATION: Electric bicycle hub motor installation requires a rear wheel base with an opening size of 170mm/6.69in. Electric bikes, power assisted bikes and mountain bikes can be converted to electric motors. 5、HIGH EFFICIENCY: Electric bike brushless wheel hub motor has high efficiency, which can greatly improve the riding fun, suitable for cyclists who like challenges. IP65 waterproof rating. Item Type: Electric Bicycle Hub Motor Material: Aluminum Alloy Opening Size: Approx. 170mm/6.69in Wheel Size: 20/26inch Mounting Position: Rear Drive Speed: 430rpm Speed: 35-40km/h Torsion: 85N.M Brake: Disc Brake 1 x Hub Motor 1 x Connecting Wire