RaceFace CINCH PF30 Bottom Bracket: 46mm ID x 100mm Shell x 30mm Spindle, External SealRace Face bottom brackets for use with 30mm spindle cranksets in the Race Face CINCH crank family. Allows the use of a CINCH 30mm spindle crankset with PF30 bottom bracket shell Standard 6806 retainer bearings Bearings are external to the BB shell resulting in a stiffer wider stance Cups are machined for a high tolerance frame fit Rubber seal located on the bearing's external side helps to reduce the risk of water penetration Installed using a