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.

SPECIFICATIONS
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

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

Technology:
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.

Contents:
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