36V 250W Brushless toothed motor specification, strong and powerful. Come with powerful controller guarantee big current supply. Suitable for both V brake and Disc brake. The maximum speed of the motor will be 30km/h. The open size of the front fork is 100mm 6. (Suitable for 20 inch bike). Crank speed sensor for pedal assist. 20 36V 250W E-Bike Conversion Kit LED Electric Bicycle Front Wheel Motor Hub. It is used to install 20-inch tires and is suitable for 20-inch bicycles. Please check the product size before purchasing. Note: while connecting the controller to the wires, please make sure that you connect the right colors to the controller. Otherwise, the controller may be broken. About the battery: The power and voltage of the battery. When installing, make sure that the wiring is not reversed. Otherwise, it may damage the product. Note: Not waterproof, please do not drive on rainy days. Specification, strong and powerful. The open size of the front fork is 100mm. Front fork open size. 100mm / 3.9in. 5 magnetic point assist sensor. Power cut-off brake lever. Waterproof wire for outgoing motor, common wiring for other. 1 Electronic power brake. Note: 20 refers to the diameter after the tire is installed, this item does not include tires! The suitable tire size is xxx. 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.