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CeramicSpeed T47/73 Bottom Bracket - 30mm Spindle Coated Races Black Model=XR 391 }Shimano Dura-Ace ST-R9250-L Di2 DualCeramicSpeed T47 73 Bottom Bracket 30mm Spindle Coated Races Black. The CeramicSpeed T47 73 bottom bracket offers bearings with extremely low friction improved power transfer and a service life that far exceeds traditional steel bearings. TECH SPECS Bottom Bracket Shell I. D. 47 BB Frame Interface T47 BB Shell Width (mm) 73 Spindle Interface Type 386 EVO Spindle Interface Type Rotor 3D+ Spindle Interface Type RaceFace Easton CINCH Defined Color Black