Shimano Dura-Ace PF24 86mm Bottom Bracket

Overview

The Shimano Dura-Ace SM-BB92-41B is a sealed press-fit bottom bracket engineered for high-performance road bikes with 86mm threaded shells. This premium component features a 24mm hollow axle, sealed bearings, and ultra-lightweight construction at just 54g, delivering exceptional rotational efficiency and reliability.

Key Features

• Press-Fit BB86 Design — Engineered for 86mm threaded bottom bracket shells; ensures precise fit and reliable clamping without additional tools or adjustments
• 24mm Hollowtech II Axle — Hollow shaft diameter optimized for stiffness and rotational efficiency; proven geometry balances strength with minimal weight
• Sealed Bearing System — Protected bearings prevent dirt and moisture infiltration; extends component life and reduces maintenance requirements
• Premium Dura-Ace Series — High-end component tuned for performance; delivers smooth, efficient rotation across demanding road cycling conditions
• Ultra-Lightweight Construction — 54g total weight represents premium engineering; minimizes drivetrain rotating mass for improved acceleration and efficiency
• 41mm Internal Diameter — Standard sizing ensures compatibility with most 86mm road bike frames and Hollowtech II cranks

Technical Specifications

• Type: Press-fit BB86
• Model: SM-BB92-41B
• Shell diameter: 41mm internal diameter
• Shell width: 86mm
• Axle diameter: 24mm (Hollowtech II)
• Bearing system: Sealed bearings
• Weight: 54g
• Series: Shimano Dura-Ace (premium)

Compatibility & Ideal Use Cases

Compatible exclusively with 86mm threaded bottom bracket shells on road bikes designed for Hollowtech II cranksets. Not compatible with BMX frames. The sealed bearings and ultra-lightweight Dura-Ace construction make this bottom bracket ideal for performance-oriented road cyclists and racers seeking maximum efficiency and minimal weight. Well-suited for competitive cycling, endurance road riding, and riders prioritizing premium component quality and low-maintenance operation. Not suitable for BMX, mountain biking, or off-road applications.