The progressive nature of SRAM has kept them ahead of the game and their all-new DUB Bottom Bracket is groundbreaking. The bottom bracket works by using one standard spindle diameter of 28.99mm that is stiff and powerful when paired with a SRAM DUB Crank. This means the DUB bottom bracket works with virtually any bottom bracket shell, so when you go to upgrade your ride, you can keep your dream crankset running for years!