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 standard.Greater bearing durabilityEasy installationPressFit cups for lighter weightISO 4210 compliant. See Declaration of Conformity for details SPECIFICATIONSBB-frame interface PF30 (68-73mm)Crank-BB interface DUBBearing type Ceramic, StandardSpindle diameter DUBSpindle length n/aChainline n/aSupport E-type FD n/aCup material Aluminum