The SRAM/TruVativ PressFit 30 Bottom Bracket takes all the best features of BB30 and PressFit bottom brackets and combines them all into a strong and lightweight package. Gutter Seal technology is pre-assembled into the cups to protect the ceramic bearings from weather and prolong life. PressFit 30 features an integrated seal, pre-assembled into the cups, to prolong bearing life Bearings are housed in nylon cups are pressed into the bottom bracket shell Designed for 30mm spindle cranksets For frames with 46mm inner-diameter bottom bracket shell PressFit 30 requires a 73mm wide shell Alloy construction with ceramic bearings