If you've got a SRAM DUB crankset — Red, Force, Rival AXS, or the MTB equivalents — and a frame with a BB30 shell, this is the bottom bracket that connects the two. The SRAM DUB BB30 fits BB30 68mm road and 73mm MTB shells and works with SRAM DUB 29mm cranks , which covers a big chunk of current SRAM road, gravel, and mountain cranksets running the oversized DUB spindle.

The reason DUB exists is that SRAM got tired of the compatibility mess between GXP 24mm spindles and BB30 30mm systems. SRAM engineered the oversized DUB spindle to work across every bottom bracket standard, simplifying crankarm compatibility, and pairs it with Gutter Seal Technology that improves sealing against the elements and sealed cartridge bearings . The 28.99mm spindle diameter splits the difference between the two older standards — enough room for proper seals and durable bearings, without the weight penalty of a full 30mm system.

For your BB30 frame, that means dropping in a bottom bracket with pressed-in aluminum cups rather than bearings sitting directly in the frame. The bearing-direct-in-frame setup that BB30 originally used depended on bike manufacturers holding precise tolerances, and when those tolerances drift you get creaking, short bearing life, and rough performance . Moving the bearings into a machined cup takes the frame's tolerance out of the equation.