The new SRAM DUB bottom bracket series connects your crankarms and protects the smooth, long-lasting application of power to your drivetrain. DUB is the single replacement for 30mm and 24mm BB spindles options. DUB bottom brackets fit all frame shell standards and do not introduce any new frame shell standards. It features press fit cups for lighter weight and an integrated adjuster. Compliant with ISO 4210 standards.