The BB47 series bottom brackets are designed to work with T47 frames. They feature Premium bearings and are protected with the highly water-resistant X-seals to keep bottom bracket running smoothly.   Features Designed to reduce creaking. Improves bearing life. Increases stiffness. Designed for use with T47 bottom brackets and Sram DUB axles.   Will fit frames with the following BB T47 / M47 Asymmetric (76.75 mm).