Shimano Dura-Ace BB-R9100 Bottom Bracket

The SHIMANO DURA-ACE BB-R9100 Hollowtech II Bottom Bracket is engineered to serve as the precise interface between your frame and the DURA-ACE R9100 crankset. Designed for efficiency and reliability, this bottom bracket combines lightweight construction with high-precision bearings and an advanced seal system to minimize rotation drag and protect against the elements. Its compact, aluminum case helps reduce overall weight, contributing to a responsive ride and smooth power transfer. Compatible with threaded English and Italian interfaces and built for road cycling, this model aims to deliver creak-free performance and consistent operation under competitive conditions while maintaining durability for long-term use.

Specifications

• Lightweight aluminum case, ~65 g
• Shell width: 68 mm or 70 mm
• Thread: English/Italian
• BSA screw-in design
• Advanced seal construction for protection
• Designed for DURA-ACE R9100 cranksets