Shimano Dura-ace BB-R9100 Bottom Bracket Italian 70MM

The Shimano BB-R9100 bottom bracket is specially designed for Dura-Ace 11- and 12-speed cranks. It has small ball bearings to minimise weight and works with Hollowtech II technology for greater stability and rotational efficiency.


SPECIFICATIONS

Application: Road, Triathlon & Time Trial
Series: Dura-Ace R9100
Type: ITA
Shell Width: 70 mm
Axle Diameter: 24 mm (Hollowtech II)


TECHNICAL INFORMATION

Bearings: Steel
Bottom Bracket Cup Material: Aluminium


COMPATIBILITY

Dura-Ace FC-R9200, FC-R9200-P, FC-R9100, FC-R9100-P, FC-9000


FEATURES

Small ball bearings for low weight
Anodised bearing cups


TECHNOLOGY

Hollowtech II
Shimano Hollowtech II is a crank bottom bracket system designed to achieve an ideal ratio of stiffness, weight and rotational efficiency. It is based on an integration of the bottom bracket and the right crank arm and works with a 24 mm axle or bearing diameter, which has proven to be optimal in terms of stability. In many cases, the bearing cups are on the outside so that the load is better distributed. High-quality precision seals ensure a long service life.