Profile Racing Bottom Bracket

This kit is designed specifically for frames with a Mid bottom bracket shell, which features a 41mm internal diameter. If your frame uses a different standard, such as Euro or Spanish, this kit will not be compatible.

Yes, the kit includes two sealed bearings, a 46mm tube spacer, a 5mm tube spacer, two color-anodized cones, and an assortment of extra spacers. You will need a bearing press or a similar tool to install the bearings into your frame.

Yes, but you must select the specific version that matches your crank spindle diameter. The 19mm and 22mm versions are not interchangeable.

The extra spacers are provided to help you fine-tune your chain line and ensure your cranks have proper clearance from the frame. You can add or remove them during installation to achieve the perfect alignment for your specific drivetrain setup.

Yes, these are standard sealed bearings. If they eventually wear out from heavy riding, you can replace the bearings individually without needing to purchase a completely new kit.

The drive side cone is 5mm thick, while the non-drive side is 10mm thick to account for the specific spacing requirements of BMX cranksets. This configuration helps center the crankset within the frame and ensures proper alignment.