1、Included Accessories: Bicycle lithium modification kit contains 48V 250W rear drive fly motor, 15A controller, S900 LCD meter, 130X shifter, 8C assist sensor, a pair of power off brake handle, motor extension wire, spoke, spoke nut, installation tools, and manual. 2、Aluminum Alloy Wheel Rims: Brushless wheel hub motor selects aluminum alloy wheel rims, and adopts fine processing, effectively enhances the rims edge, lightweight, high end and generous, strong bearing capacity, comfort is far more than other types of motor, so as to achieve noiseless operation, let you fully enjoy the fun of riding. 3、Metal Controller Housing: The controller housing is made of high quality metal with grooves designed to protect the internal circuitry from thermal overload due to good heat dissipation. 4、Multifunctional S900 Display: The S900 display has a variety of functions, can be used as a driving computer, and control the entire electric bicycle system after conversion, compatible with 36V and 48V voltage. Color display makes it easier to view data on the panel, such as remaining battery, current speed, average speed, maximum speed, clock, total one way distance, guaranteed cycling mileage. 5、Wide Applicability: 48V 250W rear drive motor kit is suitable for bicycle lithium battery modification, DIY electric bikes, electric bikes, electric scooters, folding bikes, etc. Easy to maintain, electric bike and mountain bike conversion motor, high efficiency, greatly improve the fun of riding, suitable for cyclists like challenges. Item Type: 48V 250W Rear Drive Flywheel Motor Kit Material: Stainless Steel + Aluminum Alloy + Plastic Product Size: Controller Box Size: Approx.8 x 5 x 3cm / 3.1 x 2.0 x 1.2in Meter Size: Approx.11 x 6cm / 4.3 x 2.4in Motor Type: Rear Drive Motor Motor Connector: Waterproof Connector (9 Pin) Motor Rated Power: 250W Motor Speed: About 25-28km/h Motor Speed: 207-270 RPM Motor Torsion (N.M): 29-31.2N.M Motor Opening Size(mm): Approx.142mm / 5.6in Motor Matching Controller Current: 15A Motor Rims: P19D Motor Torsion Arm: M 14 Applicable Motor Brake Disc: Approx.160mm / 6.3in Motor Brake Type: Universal V Brake And Disc Brake Motor Position: Rear Drive Motor Structure: Brushless Wheel Hub Motor Motor Magnet Height: 22H Number Of Magnetic Steel Poles Of Motor: 20 Motor Operating Temperature: -20° - 45° Controller Maximum Current: 15A Controller Speed Setting: 1-4.2V Controller Brake Input: Low Level Controller Booster: 1:5 S900 Meter Function Description: 1. Display Functions: Speed Display, Power Gear Display, Power Indicator, Fault Hint, Total Mileage, Single Mileage, Headlight Display, Single Driving Time Display.Controller Line Color Definition: 1. Black Single Big Head Wire: Waterproof Motor Wire (9 Pin) 2. Red And Black Single Big Head: Power Cord 3. Red, Blue, Black, Green And Yellow Single Row Five Wire Port: Meter Line 4. Black And Yellow Line (2pcs) : Power Off Brake Handle Line 5. Red And White Line: Throttle Dial Line 6. Brown, Black And Yellow Line: Power Sensor Line 7. Black And Red Wire (2pcs): Light Wire 1 x Motor 1 x Controller 1 x Meter 2 x Power Off Brake Handle 1 x Throttle Shifter 1 x Assist Sensor 1 x Motor Extension Cord 40 x Spokes 40 x Spoke Nut Cap 1 x Spoke Mounting Tool 1 x Manual