The Shimano Tiagra RS500 Bottom bracket Cups for Shimano Tiagra FC-4650 Hollowtech II - Compact Crankset and Tiagra FC-4600/4603 Crankset.
Key Features
- Outboard Bottom bracket bearing cups for use with Tiagra FC4600, FC4603 and Compact FC4650 2-piece cap-free design chainsets
- Minimal bearing interface gives superbly smooth rolling
- Required for installation of FC4600, FC4603and FC4650 chainset