It can be used for pure electric riding or assisted ridingIf the motor temperature exceeds 90 degrees Celsius, the controller will generate overheating protection, cut off the power supply, and work normally after cooling down!Note:If the Deep tread pattern of bicycle tire, it is easy to skid when it rains!The final effect is related to the bicycle tire and installation skills. Please carefully look at the picture instructions before installing!Note: the bicycle tire is seriously aged and needs to be replaced before installation, otherwise it is easy to wear the tire!Easy installation and removal, strong concealment!Please note that the effect will be good only if it is installed according to our requirements!Suitable battery type and parameters: 36V/48V, 8-25 Ah, travel about 20-50km;Can not be installed under general 16 inches,16-26 inch bicycles are suitable for installation It can be used for pure electric riding or assisted ridingIf the motor temperature exceeds 90 degrees Celsius, the controller will generate overheating protection, cut off the power supply, and work normally after cooling down!Note:If the Deep tread pattern of bicycle tire, it is easy to skid when it rains!The final effect is related to the bicycle tire and installation skills. Please carefully look at the picture instructions before installing!Note: the bicycle tire is seriously aged and needs to be replaced before installation, otherwise it is easy to wear the tire!Easy installation and removal, strong concealment!Please note that the effect will be good only if it is installed according to our requirements!Suitable battery type and parameters: 36V/48V, 8-25 Ah, travel about 20-50km;Can not be installed under general 16 inches,16-26 inch bicycles are suitable for installation Specifications: Materials:Aluminum alloy+plastic Motor Voltage:36-48V Fit For:City Bike/Cruiser Bike/Road Bike/Mountain Bike Size:160x120x80mm/6.3x4.7x3in Power:250W Brushless Motor Speed:18-30km/h Important: Please see the main picture 2 clearly to confirm that your bicycle can be installed. Specifications: Materials:Aluminum alloy+plastic Motor Voltage:36-48V Fit For:City Bike/Cruiser Bike/Road Bike/Mountain Bike Size:160x120x80mm/6.3x4.7x3in Power:250W Brushless Motor Speed:18-30km/h Important: Please see the main picture 2 clearly to confirm that your bicycle can be installed. Package Contents: 1 x Brushless Motor ；1 x Brushless Controller；1 x Clutch Switch；1 x Speed Adjustment Throttle；1 x Mounting Baffle；1 x Quick Screw Give away a motor wheel Battery and charger are not included, please prepare them before using. Battery and charger are not included, please prepare them before using. (Suitable battery type and parameters: 36V/48V, 8-25 Ah, travel about 20-50km) Package Contents: 1 x Brushless Motor ；1 x Brushless Controller；1 x Clutch Switch；1 x Speed Adjustment Throttle；1 x Mounting Baffle；1 x Quick Screw Give away a motor wheel Battery and charger are not included, please prepare them before using. Battery and charger are not included, please prepare them before using. (Suitable battery type and parameters: 36V/48V, 8-25 Ah, travel about 20-50km) Other controllers on the market are not compatible with our motors and are easy to break down Suitable for these model bicycleA/B/C/D A: If the distance 1.2cm B: The distance MUST >3cm C: If the distance >5cm, need break a shape like the C picture shows, need carefully to choose. D: If the distance <2.7cm, fix to the red circle. NOTE: If you have any question can't decide, please contact saller. Note: - The effect of the bicycle booster has a lot to do with the bicycle tires. If your bicycle tires have deep lines, it is recommended to apply a little Glass cement to the surface of the tire to increase the contact area, thereby increasing the friction and achieving better results. -4.0 tires, tubeless tires, and solid tires are not supported. -Can not be installed under general 16 inches. - The effect has a lot to do with tires. The larger the contact surface between bicycle tires and our wheels, the better the effect. Note: - The effect of the bicycle booster has a lot to do with the bicycle tires. If your bicycle tires have deep lines, it is recommended to apply a little Glass cement to the surface of the tire to increase the contact area, thereby increasing the friction and achieving better results. -4.0 tires, tubeless tires, and solid tires are not supported. -Can not be installed under general 16 inches. - The effect has a lot to do with tires. The larger the contact surface between bicycle tires and our wheels, the better the effect.