Front Friction drive
Product Description Item Specifics Speed 20-35km/h Voltage 36V-48V Applicable models road bike commuter bike mountain bike Brushless motor size 16.1x12x8.1cm Controller size6.3x4.8x3in Power Rated 250W weight 5 pounds Friction wheel material Material Alloy+Polyurethane Packing List Brushless Motor Electric Controller.