PF30 road bottom bracket shells are 68mm wide like BB30, but have a greater diameter, 46mm, so that bearings in cups can fit inside the shell.This kit contains all the parts you need to install a Quarq or SRAM 24/22mm spindle crank in a BB30 road or cyclocross bike.The bundle comes with two cups and CeramicSpeed bearings installed.There are two choices.Standard and Coated.The both possess super smooth CeramicSpeed balls fitted in hardened-steel races.The Coated have an additional feature:a 3-micron thick metallic layer over the races.This addition makes the races smoother and harder, lowering drag and increasing life.