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Compatible with Multiple Bikes:The Ebike Conversion kit is compatible with Fatbike, mountain bike, road bike, etc. BBS01B BBS02B 250W is suitable for 68-73mm bottom bracket.Max speed: 25Km/h Fully Equipped:Includes all necessary mounting accessories, mid drive motor, brake lever, thumb throttle, sprocket, crank, LCD display, battery charger, speed sensor and magnet, 1T4 wire, nut, battery optional. Easy installation:According to the pictures, instructions and installation videos we provide, you can install the motor within an hour, and after installation, you can choose two riding modes: electric bicycle and assisted bicycle. Battery Information: Each battery is equipped with a BMS protection board, which can ensure that the battery is charged equally. When the battery has problems such as overheating, low voltage, overcharging, overdischarge,etc.The power supply will be cut off. Select 44T or 46T chain wheel as you choice, the diameter of 44T is 7.1", the diameter of 46T is 7.5".