ceramicspeed-pf4630-bottom-bracket-osbb-specialized-frames-30mm-spindle-black
ceramicspeed-pf4630-bottom-bracket-osbb-specialized-frames-30mm-spindle-black, The CeramicSpeed OSBB (PF4630) bottom bracket offers bearings with extremely low friction, improved power transfer, and a service life that far exceeds traditional steel bearings.