BBS01B 36V 250W Mid-Drive Electric Bike Motor. Is the perfect choice for a flawless yet cost-effective Electric Bike. Bafang is renowned for producing motors that are regarded as the very best in the conversion world. Their motors are waterproof for all riding conditions, internally lubricated with sealed casings, and contain a nylon gear for a silent, yet exquisite ride every time! The 250w motor is best suited for U. Use as this is the legal riding limit. The integrated speed sensor and pedal assistance recognises and aids manual output to boost your ride by up to 15mph. Five pedal assistance modes are available, so you can conquer the toughest of rides. Bafang 36V 250W Mid Drive Motor (With XT60 Battery Connector), Thumb Throttle, E-Brakes, (Can Upgrade to Brake Sensors for Either Hydraulic Brakes or Integrated Shifters), Speed Sensor & Magnet, EB-BUS (1T4) Cable, Cranks, Chainring, Chainguard, Bottom Bracket Installation Tool, All Mounting Hardware Inc. 73mm BB Spacer for Larger Bottom Brackets. This motor weighs approximately 4kg and is designed to fit bottom brackets with a length between 68mm – 73mm (2.68 – 2.87). If you have a Fat Bike, with a 100mm – 120mm bottom bracket length, get in touch with us, as you will require an axle extension. The inner diameter of the bottom bracket should be no less than 33.5mm. More information can be found about bike compatibility on our Bike Information page.