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. Designed for use with SRAM Boost cranksets with 55mm chainlines. Gutter Seal Technology drastically improves sealing against the elements. Sealed cartridge bearings. One oversized spindle to work across every bottom bracket standard. Item Specifications: Bottom Bracket Shell I.D.: 46, BB/Frame Interface: PF30, BB Shell Width (mm): 73, Spindle Interface Type: SRAM DUB, Defined Color: Black,