Profile Racing American Retro Bottom Bracket

This kit is specifically designed for frames with an American bottom bracket shell, which is the standard press-fit size found on most vintage BMX and cruiser frames. If your frame uses a threaded Euro or Mid shell, this will not be compatible.

Yes, the kit is available in two distinct configurations to accommodate either 19mm or .875-inch spindles. Be sure to verify your crank spindle diameter before ordering to ensure a proper fit.

These are precision-sealed bearings, which are designed to be low-maintenance and resistant to dirt and grime. While they aren't meant to be taken apart and repacked like old-school loose-ball bearings, they offer significantly smoother rotation and better longevity for modern riding.

The kit is a complete package for your restoration. It includes the aluminum cups, sealed bearings, a tube spacer, and the necessary spacer washers and cones to get your crankset installed and properly aligned.

While it is styled for vintage restorations, the use of sealed bearings and durable aluminum cups makes it perfectly capable of handling modern riding. It is a great choice if you want the classic aesthetic without sacrificing the reliability of contemporary drivetrain components.