Feature:1. It is made of highquality aluminum, copper and ABS material, and is durable and has a long service life.2. The brushless hub motor can be noisefree during operation, allowing you to fully enjoy the fun of riding.3. High strength and high efficiency, it greatly improve the fun of riding, suitable for cyclists who like challenges.4. 5 spoke sizes of 2028 inches can be selected, it is easy to operate, and equipped with a display meter to display data.5. Suitable for DIY electric bicycles, it will make your ordinary bicycles become electric bicycles.Specification:Item Type: Electric Bicycle Conversion Kit Material: Aluminum + Copper + ABSProduct Color: As Pictures Shown Controller Box Size: Approx. 12.7x6.6x4cm / 5.0x2.6x1.6inProduct Weight: Approx. 5350-5550g / 188.7-195.8ozRated Current: 11ARated Voltage: DC36V / 48VSpeed Setting: 1-4.2VLow Voltage Protection: DC30 / 400.5VMaximum Current: 221ASpeed: 35Rotate Speed: 300Reduction Ratio: 1:4.5Magnet Height: 22HRear Drive Threaded Freewheel Open Gear: 135mm / 5.3inFeatures: 28-inch spokes can be shared with 29-inch, 700C.Package List:1 x Motor 1 x Controller1 x Pair of Brake Lever1 x Thumb Throttle1 x Speed Assist Sensor1 x Motor Wire1 x Instrument 1 x Instrument Manual 1 x Manual 1 x Spoke Installation Tool40 x Spoke40 x Spoke Cap