Material: Aluminum, Iron, Copper, Magnet Steel. Power Type: Lead-acid or Lithium Battery (Not Included). Gear Series Hub Motor. Motor Net Weight: 3-3.5kg/6.6-7.7lbs. Motor Diameter: 143mm/5.63inch. Motor Shaft Diameter: M14. Motor Shaft Length: 153mm/6.02inch. Motor Cable Length: 100cm/39.37inch. Number of Sensors: 3. Flat Fork Width Requirement: Min. Brake: Disc Brake Rotor Type Can be Installed 6 Screws. Braking Method: Disc Type. Corresponding Controller: 36V 350w Controller. Available Wheel Size: 20inch. Instrument Function: Fault Display, Speed Display, Mileage Display, Five-speed Booster Speed Control, and Battery Power Display. Motor Wheel Load Speed: Max 24km/h. Wheel Diameter: 42cm/16.54inch. Wheel Width: 17cm/6.69inch. 1 Front Motor Wheel. 1 Set Pedal Assistant Sensors. 1 Headlight and Horn Switch. Other Accessories for Assembly. The speed is related to wheel size, road condition, battery condition, guest load, wind Speed, and other factors. It is suitable for the front wheel of a two-wheeled bike. It cannot be used for three-wheelers or multi-wheelers. Please prepare a lead-acid battery or lithium battery of corresponding voltage in advance. Please make sure a solid connection between the motor and the controller. Please make sure that the inner core of each plug is not damaged, broken, or bent. If your kit has been in use for a while and then suddenly stops working. It could be that your motor plug is soaked in water. Please unplug it and let it dry. Then put it back in place and it will work fine. You need to connect the machine correctly and firmly during installation so that the product can work properly. If there is a mistake during the installation process, the product will not work properly. After the installation is completed, you can check whether the error code is displayed on the LCD screen. Please read the manual completely before installation and use, and pay particular attention to the safety instructions included. Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement, and make sure you do not mind before ordering. France, Germany, spain, Italy. Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday. Guaranteed Customer Service! ??? Compact Design, Unique Appearance, high reliability. Made of high quality material. Durable Material, Good quality. Stable characteristic, high reliability. Aluminum, Iron, Copper, Magnet Steel. Lead-acid or Lithium Battery (Not Included). Brushless Gear Series Hub Motor. 3-3.5kg/6.6-7.7lbs. Flat Fork Width Requirement. Disc Brake Rotor Type Can be Installed 6 Screws.