Key Features Enjoy Riding: With it, you can get rid of bicycles with pedals. Just turn the handlebar gently, and you can control the speed flexibly so that you can experience a more comfortable ride!   High-speed Riding: The product is equipped with 500W motor with 340RPM, which can provide strong power and 33-35km/h speed and give you a comfortable and labor-saving riding experience.   Versatile Features: This product has a five-speed adjustable, and also with fixed-speed cruise function. It can bring you an unprecedented riding experience.   LCD Function: The LCD meter has a power display, speed display, mileage display, fault display, real-time voltage, and current display functions, which are very convenient for you to use.   Durable Material: This product is made of high-quality aluminum, iron, copper, and magnetic steel material, which is strong, durable, and not easy to deform.   Application This is suitable for bicycles with 20in tires.    Specification Color: Black Material: Aluminum, Iron, Copper, Magnetic Steel Suspension Type: Rear Specific Uses For Product: Road Special Feature: Electric Brake Type: Power-off Brake Handle (Applicable to V Brake, Disc Brake) Power: 500W Speed: 340 RPM Torque: 30N. M Speed: 33-35km/h (No-load) Suitable Bike Wheel Size: 20*1.75-2.125inch Wheel Hub Motor Diameter: 42cm/ 16.54in Wheel Hub Motor Width: 3.2cm/ 1.26in Wheel Hub Motor Total Width: 20cm/ 7.87in Package Size: 50*50*23cm/ 19.69*19.69*9.06in Net Weight: 9.7kg/ 21.38lbs Gross Weight: 11.5kg/ 25.35lbs   Package Included 1 * Wheel Hub Motor 1 * Controller 1 * LCD Display 1 * Ordinary Thumb Knob Handle 1 * Brake Handle 1 * Controller Package 1 * Boost Sensor 1* English Installation Instruction All Accessories for Assembly   Notes 1.Please note that this product is only suitable for bicycles with a tire size of 20 inches. 2.Please note that batteries and tires are not included in this electric bicycle motor conversion kit. 3.Please read the instruction carefully before use. 4.Please note that riding speed is related to wheel size, road condition, battery condition, passenger load, wind speed, and other factors. 5.This set does not include tires and needs to be purchased by the customer. The suitable tire size is 20*1.75-2.125inch.