Chris King ThreadFit™ 24 Bottom Bracket (BSA, 24mm Cranks)

At Chris King, we build bearings—and that expertise extends directly to bottom brackets, the critical interface between rider power and bike speed. The ThreadFit™ 24 is engineered to provide the most precise, low-drag interface for 24mm cranks in BSA bottom bracket shells, ensuring smooth, efficient pedaling for the lifetime of your bike.

Designed for durability, serviceability, and silence, the ThreadFit™ 24 uses Chris King’s legendary angular-contact bearings—available in steel or ceramic—that improve over time as the surfaces burnish for faster, smoother performance. The bottom bracket is fully serviceable, allowing cleaning and repacking to maintain peak performance for years.

Each ThreadFit™ 24 comes in a variety of 8 beautifully anodized colors and includes a Fit Kit, enabling compatibility with a wide selection of road and mountain bike cranks.

Key Features

• Crank Compatibility: 24mm cranks in BSA bottom bracket shells

• Bearings: Legendary angular-contact bearings, steel or ceramic upgrade available

• Serviceable: Can be opened, cleaned, and repacked for long-term performance

• Fit Kit Included: Ensures compatibility with a wide range of cranks

• Color Options: 8 anodized finishes available

• Warranty: King Lifetime Warranty

• Made in the USA: Engineered, manufactured, and assembled in Portland, Oregon

• Performance: Low drag, smooth, and reliable for years of faithful service