Electric Bicycle Rear Wheel Conversion Kit features 36V 750W brushless and gearless hub motor for efficient running; fit for any 20' bicycle frame Motor works under Hall effect and non-Hall effect for extending life Pedal assist system for sensing your pedal cadence and allowing you to ride comfortably without pressing throttle Aluminum alloy frame for durability and stability, which can support 220 Lbs weight Brake levers for cutting off the power and braking when riding, can ensure riding safety