CERAMICSPEED T47a Bottom Bracket for Shimano

The CeramicSpeed T47a Bottom Bracket for Shimano pairs 24mm spindle cranksets (Shimano Hollowtech II) with asymmetrical T47 threaded frames—specifically featuring a 77mm shell width used on bikes like Trek or Cervélo.

Specifications

Frame Shell Width: 77 mm
Frame Shell Diameter: 47 mm (with M47 × 1.0 thread pitch)
Crank Spindle Size: 24 mm
Crank Brand Compatibility: Shimano (Hollowtech II)Bearing TypeHand-built Grade-3 Silicon Nitride (Ceramic) balls in hardened stainless-steel races
Bearing Versions: Available in Standard or Coated (corrosion-resistant treated races for greater longevity)
Weight: ~106g to 107g
Installation Tool: 16-notch, 52.2 mm outer diameter tool (e.g., Park Tool BBT-69.2)