General description SRAM Hub Bearing Set Rear is designed for high-performance cycling, compatible with various SRAM hub models including X0 Hubs, RISE 60 (B1), ROAM 30, ROAM 40, and RAIL 40. This set includes two specific bearings: 1-6903 and 1-63803D28, ensuring smooth operation and durability for your bike's rear hub. Technical specifications Includes bearings: 1-6903 and 1-63803D28 Compatible with SRAM models: X0 Hubs, RISE 60 (B1), ROAM 30, ROAM 40, RAIL 40 Part number: 11.1918.003.040