Introducing the Bafang Mid Drive Motor Conversion Kit. Free repair or replacement in case of any quality issues. Key Features: Upgrade: Experience enhanced performance with the upgraded IRFB3077 mosfets controller. Four Riding Modes: Choose from pure electric mode, human riding model, power assistance, and push models. Enjoy the flexibility of easily switching between 4 working modes. Easy Installation: Effortlessly install this mid-drive motor into your electric bicycle using just a few tools. Remove the crankset and center shaft, then use the provided installation tools for a seamless setup. Compatibility: This kit is compatible with a wide range of bikes, including mountain bikes, road bikes, racing bikes, and more, with a bottom bracket size of 68-73mm. 36V500W 68mm Mid Drive Motor Specification: Bafang Model: M315 MM G340.500. C Power: 500W Voltage:36V Controller Current: 24A Max speed with Pedal Assistance: 38-45km/h MAX Torque: 100N. M Efficiency: > 78% PAS SENSOR : Speed Sensor Reduction Ratio: 1 : 21.9 Motor Operation Temperature:-20? -45? Bafang Controller: Integrated Inside the Motor Bracket bottom length: 68mm(The bottom bracket shall be 68-73mm) Certification:CE/EN 14764/ROHS Waterproof Grade:IPX5 Net Motor Weight: 4.23kg. Package Includes: 1 36V500W68mm Mid Drive Motor 1 Display (Optional) 1 Pair Mechanical Brake Lever or Brake Sensors (Optional) 1 Pair Crank 1 Pair 44T Chainwheel(Default) – Let us know if you want 36T/42T/52T 1 Set Thumb Throttle 1 Set Speed Sensor 1 4 to 1 Cable 1 Accessories 1 User Manual 1 Bottom Bracket Remover 1 Headlight 1 Wrench Tool. 1 36V17.4AH Battery. Note: and Gear shift sensor are not included. FAQ: Q: How do I know if this mid-drive motor will fit my bike? A: This 68mm mid-drive motor is compatible with bikes having a bottom bracket width of 68mm (2.68 inches) to 73mm (2.87 inches). The inner diameter of the bracket should be 34-36mm. For 73mm bottom brackets, we’ll provide extra installation accessories. Please leave a note for the 73mm bottom bracket. Q: How do I choose between brake levers and brake sensors? A: If you have hydraulic brakes or prefer to use your own brake sensors, you can choose brake sensors. They can connect directly with your brakes for seamless functionality. Q: Can I install the motor as soon as it arrives? A: Before installing the motor, please refer to the manual and follow the instructions to connect the motor and verify its normal operation.