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Shimano Dura-Ace BB-R9100 Howllowtech II Bottom Bracket



Shimano BB-R9100 Dura-Ace. Bottom brackets come with small ball bearings for lightweight. Advanced seal construction for smoother rotation.

Crank Interface: Threaded
Available in English 68mm (BSA) or Italian threading 70mm
BB Shell Width: 68mm/70mm
Average Weight: 65g
Axle Diameter: 24 mm (Hollowtech II)

Technical Information:
Bearings: steel
Bottom Bracket Cup Material: aluminium
Bottom Bracket Shell Material: CFRP

- small ball bearings keep weight low
- bearing cups anodized
- recommended for Dura Ace FC-R9100, FC-R9100-P, FC-9000

Hollowtech II
The outboard bearings offer better weight distribution and more stability that provides a more efficient power transfer. The diameter of the bearing axle (24 mm) was an important factor in development because the axle has a positive effect on stiffness, stability, weight, and rotating efficiency.

1 x Shimano Dura Ace BB-R9100 right bearing cup, bearings included
1 x Shimano Dura Ace BB-R9100 left bearing shell, bearings included
1 x Shimano bottom bracket shell

Factory Numbers UPC #
BSA: I-BBR9100B 689228858619
ITA: I-BBR9100I 689228858602

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