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CeramicSpeed BSA Threaded BB Road 24mm Standard Black MPFN-121-0025 }Full Speed Ahead Integrated HeadsetCeramicSpeed BSA Road Bottom Bracket English Thread 68mm 24mm Spindle Black. The CeramicSpeed BSA (English) bottom bracket offers bearings with extremely low friction improved power transfer and a service life that far exceeds traditional steel bearings. TECH SPECS Defined Color Black Bottom Bracket Shell I. D. 1. 37 Spindle Interface Type Shimano Hollowtech II Spindle Interface Type FSA MegaExo Spindle Interface Type FSA MegaExo Light Spindle