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The bottom bracket category is more complex than any other drivetrain component — not because the part itself is complicated, but because the number of standards in play is. Bottom brackets connect your crankset to your frame, and the combination of frame shell standard (threaded BSA, press-fit BB86, T47, PF30, BBRight) and crankset spindle diameter (Shimano 24mm, SRAM DUB, GXP, 30mm) determines exactly which BB you need. Getting that combination right is the first step; bearing quality is the second.

The RA Cycles bottom bracket collection covers both. CeramicSpeed and Chris King anchor the high end with ceramic and coated options that reduce friction and extend service intervals. Enduro Bearings and Wheels Manufacturing cover angular contact and standard steel options across dozens of shell and spindle combinations. Campagnolo factory-compatible BBs round out the lineup. With 400+ SKUs, this is one of the most comprehensive BB selections available.

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About Bottom Brackets

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.

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R&A Cycles - 50th Anniversary

50 YEARS AND COUNTING

From a Brooklyn storefront to flagships in Walnut Creek and Miami, from handwritten mail orders to a fully digital custom bike builder — RA Cycles has spent half a century doing one thing: serving riders who demand the best. That half-century belongs as much to you as it does to us. The riders who kept coming back, who sent their friends, who trusted us with bikes that matter — you're the reason we're still here. Here's to the next fifty.

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