TheTheoryBottom Bracket Cupsallow you to use a mid size sealed bearing bottom bracket in an American size frame. They are made out of anodized 7000-series aluminum. These are made to fit 50.8mm frames and 41.2mm OD bearings.

Color: Hot Pink

Note: This part was colored by anodizing, which is a method of coloring metal. Color differences do occur among manufacturers and even among batches from the same manufacturer. This is not a flaw or imperfection, but it is inherent to the anodizing process. We make every effort to show accurate photos of products, but it is not possible to display every color variation. We are not responsible if a part doesn’t match other items you own or is not the color you expected.