Powallon Bottom Bracket Adapter Ring for Mid Drive Motor – 41mm / 46mm / 51.3mm Inner Diameter to 33.5mm – Aluminum Alloy 6061, BB Tool for BAFANG TONGSHENG Mid Drive Motor (1 Pair) (46mm to 33.5mm)

• DESIGNED FOR MID DRIVE MOTOR: This bottom bracket adapter ring is specially designed for mid drive motor installation. It supports the standard 33.5mm motor axle while helping bikes with larger bottom bracket inner diameters fit properly, solving compatibility issues easily.
• EASY INSTALLATION: No extra tools required for setup.Simply choose the correct size ring, insert the motor axle through the adapter, and secure it using your motor’s locknut or lockring on the non-drive side — just like installing on a standard BSA bottom bracket.
• DURABLE MATERIAL: Precision-built aluminum alloy 6061.Made from high-quality aluminum alloy 6061 with an anodized black finish, this adapter ring is lightweight yet strong. It’s scratch-resistant, corrosion-resistant, and won’t fade even after long-term use.
• WIDE COMPATIBILITY: Fits popular mid drive systems.Compatible with BAFANG, TONGSHENG, TOP7ven, and other brands. Perfect for models such as BBS02, BBSHD, TSDZ8, TSDZ16, and TSDZ2, ensuring a stable and precise installation experience.
• MULTIPLE SIZE OPTIONS: Convert to standard 33.5mm.Available in 3 sizes — 41mm, 46mm, and 51.3mm inner diameter — allowing you to convert your bottom bracket inner diameter to the 33.5mm standard for mid drive motor installation.

The Bottom Bracket Adapter Ring is designed to make mid drive motor installation easier and more precise. Many eBike frames have oversized bottom bracket inner diameters that do not fit the 33.5mm standard used by most mid drive motors such as BAFANG, TONGSHENG. This adapter ring perfectly bridges that gap, ensuring your motor installs securely and operates smoothly. Crafted from premium 6061 aluminum alloy, each ring is anodized in matte black, providing exceptional durability against wear, corrosion, and fading. Installation is fast and simple — no extra tools needed. Just pick the correct size, fit it over your motor axle, and lock it down with your motor’s built-in hardware. Available in three inner diameter sizes (41mm / 46mm / 51.3mm) with a standard 33.5mm inner diameter, this adapter set ensures perfect fitment for various frame types. Whether you're installing a BBS02, BBSHD, TSDZ8, TSDZ16, or TSDZ2, this adapter ring guarantees a tight, secure, and professional fit.