Shimano PF24 Tiagra BB-RS500-PB Bottom Bracket

Product Overview

The Shimano PF24 Tiagra BB-RS500-PB is a sealed cartridge bottom bracket engineered for road and gravel cycling. The 24mm hollow-core axle reduces weight while maintaining rigid power transfer, and sealed bearings protect against moisture and contamination in varied conditions.

Key Features

• Press-fit installation — 86.5mm shell diameter fits standard road and gravel frame bottom bracket shells without external cups or adapters
• Sealed cartridge design — Integrated bearing seals keep internal components protected from water, dirt, and moisture for extended service life
• 24mm hollow axle — Lightweight yet rigid construction reduces rotational mass while maintaining efficient power transfer
• 41mm internal diameter — Optimized for 24mm crankset spindles across Shimano road and gravel groupsets
• Lightweight construction — 71g weight minimizes drivetrain mass without compromising durability or performance

Technical Specifications

• Bottom bracket type: Press-fit cartridge
• Shell diameter: 86.5mm
• Axle diameter: 24mm (hollow core)
• Internal diameter: 41mm
• Weight: 71g
• Bearing type: Sealed cartridge bearings
• Compatibility: Shimano Tiagra and compatible 24mm crankset systems
• Finish: Standard Shimano protective coating

Compatibility and Ideal Use Cases

Compatible with road and gravel frames featuring 86.5mm press-fit bottom bracket shells and Shimano 24mm crankset systems. Essential for Tiagra groupset builds or upgrades requiring reliable sealed bearing performance. Ideal for riders in wet or variable conditions where bearing protection extends maintenance intervals. Works with Shimano road and gravel cranksets across compatible groupset generations. Requires press-fit installation tool or professional bike shop installation.