Bottom bracket for road bike Shimano Dura-Ace IBBR9100B

The Shimano Dura-Ace BB-R9100 bottom bracket (ref. IBBR9100B) is the epitome of transmission excellence for road cycling. Developed for Dura-Ace groupsets, it offers an exceptional level of performance, with optimum smoothness of rotation and reduced weight to meet the demands of the most competitive cyclists.

Thanks to its smaller ball bearings and lighter design, this gearbox minimises energy loss while optimising overall pedalling efficiency. Its advanced sealing system provides effective protection against water and impurities, guaranteeing increased durability and consistent performance, even in difficult conditions.

Compatible with BSA or Italian threaded frames (68/70 mm) and Shimano Hollowtech II cranksets (24 mm axle), it ensures maximum rigidity and perfect power transmission. Lightweight (around 65g), it's a must-have choice for cyclists looking for marginal gains in both competition and training.

Key features:

• Dura-Ace range: top-of-the-range performance
• High-precision bearings for ultra-smooth rotation
• Lightweight construction to optimise weight
• Reinforced sealing against water and dust
• Standard BSA or Italian thread (68/70 mm)
• Compatible with Shimano Hollowtech II (24 mm axis)

FAQ - BB-R9100 Dura-Ace housing Shimano

Is this gearbox compatible with my bike?
It is compatible with BSA 68mm or Italian 70mm threaded frames and Shimano Hollowtech II cranksets.

What's the difference with Ultegra or 105?
Dura-Ace offers higher-performance bearings, reduced weight and improved smoothness, all geared towards racing.

Is it suitable for intensive use?
Yes, it is designed for intensive use, particularly in competition or demanding training.

What's its main feature?
Its smaller bearings reduce weight while maintaining excellent rotation efficiency.

Is it easy to fit?
Yes, with a standard Shimano threaded housing tool, installation is quick and safe.