Engineered for uncompromising performance and a perfectly smooth pedal stroke, the Shimano Dura-Ace BB-R9100 bottom bracket is the definitive solution for Italian threaded frames.

The Shimano Dura-Ace BB-R9100 bottom bracket is a premium component meticulously crafted to be the rock-solid foundation of a high-performance road drivetrain. This bottom bracket is specifically designed for frames with an **Italian threaded (36mm x 24 TPI)**, **70mm** bottom bracket shell, ensuring a precise and secure fit that is engineered to resist creaking. Its lightweight design is centered around high-quality, low-friction bearings and superior sealing technology that keeps out dirt and water, all of which work in perfect harmony to provide a silky-smooth rotation and long-lasting durability. This bottom bracket is a crucial component for maximizing power transfer and maintaining the legendary performance of your Dura-Ace crankset.

• Genuine Dura-Ace R9100 series component for top-tier road performance.
• **Italian threaded** compatibility for frames with a 36mm x 24 TPI shell.
• Specifically designed for a **70mm** bottom bracket shell width.
• High-quality bearings and enhanced sealing for low friction and long durability.
• A crucial component for efficient power transfer and a smooth pedal stroke.