Shimano Sealed PF24 SM-BB72-41B 86mm Bottom Bracket

Overview

The Shimano SM-BB72-41B is a sealed press-fit bottom bracket designed for road and city bikes with 86mm threaded shells. This Hollowtech II component features a 24mm hollow axle shaft and small ball bearings, delivering low weight and reliable rotational efficiency across varied riding conditions.

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
• Small Ball Bearings — Compact bearing design reduces overall weight while maintaining smooth spindle rotation and extended bearing life
• Sealed Bearing System — Protective seals prevent dirt and moisture infiltration; extends component life and reduces maintenance requirements
• Synthetic Resin Cup Material — Lightweight bottom bracket cups resist corrosion and provide reliable press-fit retention
• Lightweight Construction — 69g total weight keeps drivetrain rotating mass low; improves acceleration and responsiveness

Technical Specifications

• Type: Press-fit BB86
• Shell diameter: 41mm
• Shell width: 86.5mm
• Axle diameter: 24mm (Hollowtech II)
• Bearing type: Steel small ball bearings
• Bottom bracket cup material: Synthetic resin
• Sealing system: Sealed bearings
• Weight: 69g
• Application: Road, City bikes

Compatibility & Ideal Use Cases

Compatible exclusively with 86mm threaded bottom bracket shells commonly found on road and city bikes. Not compatible with BMX frames. The sealed bearing system and lightweight construction make this bottom bracket ideal for riders seeking reliable, low-maintenance drivetrain performance on paved surfaces and casual cycling. Well-suited for casual commuting, fitness riding, and light touring where efficiency and durability are priorities. Not suitable for BMX, mountain biking, or off-road applications.