The SRAM DUB bottom bracket series has a simple job - connect your crankarms and protect the smooth, long-lasting application of power to your drivetrain. To allow that singular focus, we've engineered the DUB spindle to be the one true unifying component. One oversized spindle to work across every bottom bracket specification. For better crankarm compatibility. For better protection from the elements. For longer-lasting performance. To be stronger, smoother, simpler. Now, back to the ride.- DUB is the single replacement for 30mm and 24mm BB spindles options- DUB bottom brackets fit all frame shell standards- DUB does NOT introduce any new frame shell standardsFor 100mm shell:- One oversized spindle to work across every bottom bracket specification- Gutter Seal Technology seals against the elements- Significantly lighter than GXP system