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Keep your BAFANG mid drive motor running at peak performance with this genuine replacement Axial Pinion, specifically designed for the BAFANG BBS01 and BBS02 mid drive motor range. With a diameter of 14mm and a length of 55mm, this axial pinion is a precise, direct-fit replacement for the original component — restoring smooth, efficient power transfer from your motor to the drivetrain without the need for a full motor replacement. Whether your current pinion is worn, chipped, or damaged, swapping it out with a fresh OEM-spec part is the most cost-effective way to restore your BAFANG motor to full working order.
The axial pinion is a critical internal gear component within the BAFANG BBS01 and BBS02 mid drive motor. It sits on the motor’s output shaft and meshes directly with the primary reduction gear, transmitting rotational force from the motor through the gear reduction system and ultimately to the bottom bracket and chainring. Because it operates under continuous load and high rotational speeds, the axial pinion is one of the most wear-prone components inside a BAFANG mid drive motor — particularly on bikes used for heavy off-road riding, cargo carrying, or steep hill climbing where motor torque demands are highest. Symptoms of a worn axial pinion include unusual grinding or clicking noises from the motor, loss of power transmission efficiency, and in severe cases complete drive failure. Replacing the axial pinion promptly at the first signs of wear prevents secondary damage to surrounding gears and motor internals. For a full range of compatible BAFANG mid drive service components, browse our BAFANG Mid Drive Parts at All4eBikes.
This axial pinion is manufactured to OEM specifications — 14mm diameter and 55mm in length — ensuring a precise, rattle-free fit within the BBS01 and BBS02 motor housings. The BAFANG BBS01 (250W–350W) and BBS02 (500W–750W) are two of the most widely used mid drive motors in the global ebike conversion market, fitted to thousands of bikes across the UK and Europe. Having access to quality, correctly-specced replacement parts is essential for keeping these motors in long-term service. Installation requires basic mechanical aptitude and the correct BAFANG motor opening tools — if you need support, our team offers a BAFANG mid drive service and repair to help get your motor back on the road quickly and correctly.
Whether you’re carrying out a full motor rebuild or a targeted pinion replacement, All4eBikes stocks the BAFANG parts and accessories you need to keep your electric bike running. If you’re considering a full mid drive conversion or upgrading your existing setup, explore our BAFANG mid drive conversion kits — complete with motor, display, and all ancillaries for a professional-grade ebike build. Order your axial pinion today with fast UK delivery from All4eBikes.
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