Sunlite American BB Conversion Kit

This kit allows you to install a modern three-piece crankset onto a bicycle frame that was originally built for an American-style bottom bracket. It essentially bridges the gap between older frame standards and modern, more accessible crankset options.

Yes, this kit is specifically designed for frames with American bottom bracket shells, which are standard on many vintage and BMX-style bicycles. It is a common solution for riders looking to upgrade their drivetrain without replacing the frame.

The kit is designed for standard JIS square taper cranksets. While it covers a wide range of common cranksets, you should verify that your specific crankset uses the JIS taper standard rather than the ISO standard to ensure a proper fit.

The included spindle is 130mm long. This length is critical because it determines your chainline; if your new crankset requires a different spindle length for proper alignment, this kit may not provide the correct chainline for your specific drivetrain setup.

The kit includes the necessary components to adapt your American shell to the JIS square taper spindle. However, you will still need the appropriate tools for removing your old bottom bracket and installing the new cups and bearings.