CeramicSpeed BB Alpha Bottom Bracket – T47/86 (Inboard)

Performance & Use Case
BB Alpha is designed to outlast the frame it is fitted to. For T47 86mm threaded framesets, it is the bottom bracket that resists the contamination that typically kills standard alloy bearings within a season. For road, tri and track riders building a long-life T47 frameset, it is the bottom bracket that won’t be the weak link.

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 and make installation quicker.

Compatibility
Fits any frameset with a T47 86mm threaded shell, bearings placed inboard. Two spindle-compatibility options cover Shimano Hollowtech II (24mm) and SRAM DUB (28.99mm). Select the variant that matches your crankset. All BB Alpha models are backed by CeramicSpeed’s lifetime warranty.