This is the Chris King ThreadFit 24mm bottom bracket in black, a threaded unit for 24mm-spindle cranksets in English-threaded 68 and 73mm shells. The steel bearings are manufactured at King’s Portland facility, and a fit kit adapts the unit to specific cranksets — Fit Kit #4 covers standard 24mm Shimano cranks.
It serves road and mountain frames that deserve better than disposable bottom brackets, spinning smoothly season after season with basic service. The threaded interface installs with ordinary BB tools and never creaks like press-fit.
Chris King Precision Components has machined bicycle components in Portland, Oregon since 1976, making its own bearings from domestic-mill materials and anodizing parts in-house.
