SM-BB9000 bottom bracket cups for the new Dura Ace Hollowtech II crankset FC-9000. Suitable for frames with (B.C.1.37" x 24T) English thread.
- Outside positioned bearings for better weight distribution and more stability
- Bottom bracket has smaller, bearings than current model for lightweight
- New improved sealing ensures 50% less drag
- BSA (1.37 x 24), 68mm