If you don’t use brakes with sensors you destroy wheel and after you can’t return the wheel back. ?????? Powerful Hub Motor: 27.5 48V/52V real 1500W in the pick its 1850W super power brushless gearless hub motor. Premium Materials: alloy rim & stainless steel spoke, Rare-earth metal magnates are used in the motor to efficiently produce large power. Drive system without moving chains or gears: No friction, more efficient, less chance to break. The brake shuts off motor automatically: Saves energy and improves safety. Size: 27.5 inches(Wheel size). Type: Bicycle Conversion Kit. Brake Type: Hand Brake. Wheel Type: Rear Wheel (27.5 / 48V/52V / 1500W). Power: 1500W/48V/52V or 250W/48V/52V. Spokes: Steel, 12G×0.1. Max load capacity: 551lbs. Electric Bike Part Type: Conversion Kit. Compatible Bike Type: Universal. 1x Brushless Gearless Motor Rear Wheel. 1x Intelligent Motor Controller. 1x Pedal Assist Crank Sensor. 1x Cable Ties & Plastic Coil. 1x Pair of Handle Bars (included Twist Throttle). 1x LCD meter SW900. 1x Pair of Brake Handles. 1x bag for controller. Integrade in wheel space for Cassette!! But Without cassette &####128077;&####127995. Battery and charger are not included in package.