SRAM BB DUB PF30 MTB 73The 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. One oversized spindle to work across every bottom bracket standard Significantly lighter than GXP system Gutter Seal Technology drastically improves sealing against the elements