Sram: SINGULAR FOCUS. BETTER SOLUTION. The new 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 standard. 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 standardGutter Seal Technology™ drastically improves sealing against the elementsSignificantly lighter than GXP® systemSealed cartridge bearingsISO 4210 compliant. See Declaration of Conformity for details. SPECIFICATIONSBB-frame interface: English/BSA 73mmCrank-BB interface: DUBBearing type: StandardSpindle diameter: DUBSpindle length: n/aChainline: n/aSupport E-type FD: n/aCup material: Aluminum