BB86 pressfit bottom bracket Shimano Dura Ace ISMBB9241B

Designed for cyclists looking for pure performance, the Shimano Dura-Ace SM-BB92-41B bottom bracket (ref. ISMBB9241B) is the top-of-the-range BB86 PressFit system. Developed for Dura-Ace groupsets, it offers exceptional performance, incomparable smoothness of rotation and optimum reliability on the road and in competition.

Thanks to its high-precision bearings and optimised design, this gearbox significantly reduces friction, improving pedalling efficiency. Its advanced sealing system limits water and dust infiltration while reducing resistance to rotation by up to 50%, guaranteeing consistent performance over time .

Compatible with PressFit BB86 standard frames (diameter 41 mm, width 86.5 mm) and Shimano Hollowtech II cranksets with 24 mm axles, it ensures perfect rigidity and direct power transmission. Its aluminium construction and lightweight internal components make it an ideal choice for demanding cyclists and competitors.

Highlights:

• Dura-Ace range: maximum performance and reliability
• High-precision bearings for ultra-smooth rotation
• Reduced friction for greater efficiency
• Reinforced sealing against water and dust
• Standard PressFit BB86 (41 x 86.5 mm)
• 24 mm axle compatible Shimano Hollowtech II

Case FAQ Shimano Dura-Ace BB86

What is the difference with an Ultegra or RS500?
The Dura-Ace benefits from higher performance bearings, better sealing and greater friction reduction, making it ideal for intensive or competitive use.

Is this gearbox compatible with my bike?
It is only compatible with PressFit BB86 frames (41 mm internal diameter, 86.5 mm width).

What cranksets does it work with?
It is designed for Shimano Hollowtech II cranksets with 24 mm axles, as well as certain compatible models.

Is it suitable for intensive use or competition?
Yes, it's a top-of-the-range gearbox designed for performance, used in road racing.

Is assembly complicated?
A special press is recommended to ensure precise assembly and avoid damaging the frame.