Performance & Use Case
BB Alpha is designed to outlast the frame it is fitted to. For BSA English-threaded framesets, it is the bottom bracket that resists the contamination from water, grit and dust that typically kills standard alloy bearings within a season. Road and gravel / MTB seal options tune the bearing protection to ride conditions - road seals run smoother in dry conditions, gravel / MTB seals add protection where contamination is constant.

Construction & Materials
Each BB Alpha unit features hardened stainless steel races hand-built with grade 3 Silicon Nitride ceramic balls. Custom-engineered seals and precision dust covers together provide up to 500% better moisture protection than standard bottom brackets, while still maintaining ultra-low friction. A simplified spacer tube design and lighter cups give a 10% weight saving over previous BB Alpha generations.

Compatibility
Fits any frameset with a BSA English-threaded 68mm shell. Three spindle-compatibility options cover the major crankset standards: Shimano Hollowtech II (24mm), SRAM DUB (28.99mm) and Rotor / FSA (30mm). Each spindle option is available with a road seal or a gravel / MTB seal. Select the variant that matches your crankset and the conditions you ride. All BB Alpha models are backed by CeramicSpeed's lifetime warranty.