Replacing or upgrading a bottom bracket involves matching three variables: the shell standard on your frame, the spindle diameter of your crankset, and your performance priorities. Common shell standards include the traditional BSA threaded (68mm or 73mm), the Italian threaded format, BB86 and BB92 press-fit, T47 threaded, PF30, and proprietary formats like BBRight and EVO386. Spindle standards span Shimano 24mm, SRAM DUB (30mm), SRAM GXP, and others. The right bottom bracket bridges the two — and getting that match correct matters as much as the bearing quality inside.

RA Cycles stocks bottom brackets from CeramicSpeed, Chris King, Enduro Bearings, Wheels Manufacturing, and Campagnolo. CeramicSpeed’s coated ceramic bearings deliver measurable friction reduction and are available across most major shell and spindle combinations. Chris King’s ThreadFit line offers precision-machined steel and ceramic options in a wide range of colors. Enduro’s TorqTite angular contact BBs provide a stiffer alternative to standard press-fit designs. Wheels Manufacturing covers practical adapter solutions across the broadest range of combinations in the collection.

Pair your bottom bracket with a new crankset in our cranksets and chainrings collection, or explore complete groupsets at RA Cycles.