ceramicspeed-trek-bb90-bottom-bracket-sram-gxp-and-trek-coated-races-black
ceramicspeed-trek-bb90-bottom-bracket-sram-gxp-and-trek-coated-races-black, The CeramicSpeed BB90 bottom bracket offers bearings with extremely low friction, improved power transfer, and a service life that far exceeds traditional steel bearings.