High-Speed Motor Electric Bicycle High Speed Hub Motor Front Rear Wheel1031. Tyre:Brushless Geared motor Rated Voltage(V):36V Rated Power(W):250W, 350W, 500W RPM:320,330,350 Rated Speed(km/h):25-32 Rated Efficiency(%): equal 80 O. D(mm):100mm Front/135-142mm rear Freewheel:6-10Speed Spokes Specification:12G/13G Hallsensor:Yes Integrate speed sensor:Yes Brake type:V/Disc brake Noise(db):Less than 55db Waterproof Grade:IP54 Salt fog test:24/96 Cable Location:Shaft center right Weight:250W 350W for 2.6g Front/2.8kg Rear, 500W 3.55kg Front/3.65kg Rear Colour:black Material:iron Package Contents: 1 x motor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.