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 elements Sealed cartridge bearings One oversized spindle to work across every bottom bracket standard Significantly lighter than GXP system Item Specifications BB Shell Width (mm) 83 BB/Frame Interface English Bottom Bracket Shell I.D. 1.37 Defined Color Black