Shimano Dura-Ace BB-R9100 Hollowtech II Bottom Bracket
System engineering at its peak. Each of the components magnifies the qualities of the others for an unparalleled level of performance. Optimizing input to maximize output. That's how it achieves supremacy.
Bottom bracket with small ball bearings for lightweight
Advanced seal construction for smoother rotation
English Thread (BSA) or Italian
BB Shell Width: 68mm or 70mm
Average Weight: 65g
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