Feature:1. List Includes: The 36V 250W rear drive thread freewheel motor wheel fully waterproof kit includes a 20 inch rear motor wheel, 15A controller, LCD display meter, throttle shifter, D12 power assist sensor, and one for two extension cable.2. Wheel Rim: The wheel rim made of aluminum alloy has undergone fine processing, which effectively strengthens the edge of the rim, has strong load bearing capacity, and is far more comfortable than other types of motors.3. Motor Controller: Brushless motor controller, the shell is made of high quality metal with groove design. Due to its good heat dissipation function, it can protect the internal circuit and avoid thermal overload. It also provides stable speed and sensitive braking and direction change control.4. Waterproof Conversion Kit: Full waterproof kit connector, the waterproof function to ensure maximum durability in any weather conditions, high performance wire and waterproof interface are durable, to ensure long term use of low failure rate.5. Application: Suitable for bicycle rear wheel modification, easy to maintain, electric bicycle and mountain bike modification conversion, greatly improving the riding pleasure, suitable for cyclists who like challenges, DIY modified electric bike.Specification:Item Type: 20 Inch Rear Wheel 36V 250W Electric Bike Conversion KitMaterial: Aluminum Alloy + Stainless SteelProduct Color: As Pictures ShownOpening Size: Approx. 135-142mm / 5.3-5.6in Disc Brake Rotor Size: Approx. 160mm / 6.3in Applicable Tire Size for Motor Wheel: 20 InchesProduct Weight: Approx. 5500g / 194.0ozMotor: Rear Drive Threaded Freewheel MotorVoltage: 36VPower: 250WSpeed: 25-28 km/hSpeed: 207-270 RpmTorque: 29-31.2 N.MConnector Type: Waterproof ConnectorMatching Controller Current: 15ARim: P19DMoment Arm: M14Motor Structure: Gear MotorMagnet Height: 22HNumber of Poles of Magnet: 20Brake Type: Universal for V Brake / Disc Brake Controller Wire Color Definition:1. Black big head long wire: Motor wire2. Red and black single short wire: Power cord3. Black big head short wire (fine hole): One for four / One for five (9 cores)4. Black wire with yellow head: for PAS power sensor wire .Package List:1 x Rear wheel spinning motor wheel1 x Motor extension cable1 x 15A full waterproof controller1 x GD01 full waterproof meter1 x Throttle dial1 x One-to-two extension cord1 x D12 power assist sensor wiring1 x D12 booster sensor booster sheet1 x D12 booster sensor ring2 x Cable ties1 x Installation manual1 x Winding tubeNote:For rear wheel modification, the power and voltage match can be applied.