The Shimano Dura-Ace R9100 R9100 Hollowtech II Italian Bottom Bracket is an External cup bottom bracket for Italian threaded frames (70mm Shell Width). Dura-Ace uses the highest grade bearings Shimano offers.
- Bottom bracket with small ball bearings for reduced weight
- Advanced seal construction for smoother rotation
Spindle Diameter: 24mm (Shimano Hollowtech II)
Frame Compatibility: Italian Threaded
This product was added to our catalog on March 7, 2018