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.Key Features:One oversized spindle to work across every bottom bracket standard.Greater bearing durability.ISO 4210 compliant. See Declaration of Conformity for details.Specifications:BB-frame interface: BB30.Crank-BB interface: DUB.Bearing type: Standard.Spindle diameter: DUB.Spindle length: n/a.Chain line: n/a.Support E-type FD: n/a.Cup material: Aluminium.