Facilitate the Correct Installation of Bafang Mid - drive Motors Our bottom bracket bushings, with a thickness of 2.5mm and an inner diameter of 35mm, are ingeniously designed to fit various frame lengths. For users who need to install Bafang BBS01B, BBS02B, and BBS - HD mid - drive motors on bicycles with shorter bottom brackets, these bushings can extend the bottom bracket, ensuring the correct installation of the motor. Effortless and Flexible Installation What if you encounter a situation where the bottom bracket of your bicycle is shorter than the motor's crankshaft? Our bushings are here to help. They provide the necessary extension length, enabling the smooth and secure installation of the motor. Bid farewell to installation challenges and embrace an easy - going installation process that gets your electric bicycle up and running in no time. Exceptional Durability for Long - term Use These bushings are made of high - strength materials, ensuring long - lasting durability. They can withstand the enormous pressure generated during the operation of the mid - drive motor without any decline in performance. Whether you're commuting daily or embarking on an off - road adventure, you can rely on these bushings to endure the test of time and harsh conditions. Precision - engineered for Performance Optimization These bushings are meticulously designed with extremely high precision and are the key to maintaining the perfect spacing and alignment between the motor and the bike frame. In this way, they can significantly reduce vibrations and ensure smooth and efficient power transmission. You will experience a ride that is not only stable but also fully unleashes the performance of the Bafang mid - drive motor.