SRAM DUB English Bottom Bracket - English/BSA 68/73mm Black. 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.Gutter Seal Technology™ drastically improves sealing against the elementsSealed cartridge bearingsOne oversized spindle to work across every bottom bracket standardSignificantly lighter than GXP system