A bottom bracket built to outlast your frame. The CeramicSpeed BB ALPHA is custom-engineered to precisely pair a 24 mm axle crankset from Shimano (or other compatible brands) with a threaded T47a asymmetric frame (77 mm shell width).
BB ALPHA features hardened stainless-steel races hand-built with Grade-3 Silicon Nitride ceramic balls, custom-engineered seals, and precision dust covers—delivering up to 500% better moisture protection while retaining ultra-low friction performance. The simplified spacer tube design and lighter cups ensure quick installation and a 10% weight reduction over previous generations. All CeramicSpeed BB ALPHA models are backed by a lifetime warranty.
Key Features
Lifetime Warranty
Hardened stainless-steel races with Grade-3 ceramic balls
Up to 500% improved moisture and contamination protection
Corrosion resistant by design with ultra-low friction performance
10% weight reduction and simplified spacer tube design
Lightweight, reusable, and fully serviceable construction
Technical Specifications
Brand
CeramicSpeed
Model
BB ALPHA T47a Shimano Road
Part Number (SKU)
115444
BB Standard (BB Type)
T47a (Asymmetric threaded, 77 mm width)
Crank Spindle Diameter
24.0 mm (Shimano standard)
Crank Brand Compatibility
Shimano
Discipline
Road, Tri, and Track
Net Weight
107.0 g
Gross Weight
222 g
In the Box
CeramicSpeed BB ALPHA for T47a Shimano Road bottom bracket
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