Original Shimano parts guarantees that all components work perfectly for optimum performance and maximum safety and longevity.
- Bottom bracket
- Lightweight to offset weight disadvantage of drivetrain. -19.3g (sm-bb93 vs. Sm-bb91-41a)
- Smoother rotation
- Better sealing performance
- Durable enough for mountain bike usage
- Fits various frame
- For threaded bottom bracket