The price you see is the final price. 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. 48V750W68mm Mid Drive Motor Specification: Bafang Model: M315 MM G340.750. C Power: 750W Voltage:48V Controller Current: 24A Max speed with Pedal Assistance: 50-55km/h No Load Speed(RPM) :126±7 Load Speed(RPM): 110±6 No-load Speed:59.7km/h Load Speed: 47.5km/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: 4.3kg. 1 Set Thumb Throttle 1 Set Speed Sensor 1 Can Display (Optional) 1 4 to 1 Cable 1 Accessories 1 User Manual 1 6V Headlight 1 Wrench Tool 1 Bottom Bracekt Remover. If you choose the battery option, it comes with a charger. If you choose “no battery, ” please note that the motor kit does not include a battery. Note: Gear shift sensor is not included. 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. Please ensure not to disconnect any connections while the power supply is still active.