The SRAM DUB bottom bracket series has a simple job- to connect crankarms and protect the smooth, long-lasting application of power to the drivetrain. SRAM engineered the oversized DUB spindle to work across every bottom bracket standard, simplifying crankarm compatibility.For use with a Cannondale Ai frame interfaceGutter Seal Technology drastically improves sealing against the elementsSealed cartridge bearingsOne oversized spindle to work across every bottom bracket standardSignificantly lighter than GXP systemItem SpecificationsBB Shell Width (mm)83BB/Frame InterfaceEnglishBottom Bracket Shell I.D.1.37Defined ColorBlackSpindle Interface TypeSRAM DUB SRAM DUB Threaded Bottom Bracket Bottom Brackets UPC: 710845837487