- Outboard Bottom bracket bearing cups for use with 2-piece cap-free design road chainsets
- Minimal bearing interface gives superbly smooth rolling
- Easy installation
- British thread
- Bottom Brackets
- BB-RS501 bottom bracket cups, English thread cups
- Outboard Bottom bracket bearing cups for use with 2-piece cap-free design road chainsets
- Minimal bearing interface gives superbly smooth rolling
- Easy installation
- British thread