Sram: SINGULAR FOCUS. BETTER SOLUTION. 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.FEATURESOne oversized spindle to work across every bottom bracket specificationGutter Seal Technology™ seals against the elementsSignificantly lighter than GXP® systemSealed cartridge bearings available in both stainless and ceramic versionsISO 4210 compliant. See Declaration of Conformity for details. SPECIFICATIONSBB-frame interface: BSACrank-BB interface: DUBBearing type: CeramicSpindle diameter: DUBSpindle length: n/aChainline: n/aSupport E-type FD: n/aCup material: Aluminum