Sram: 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 specification.Easy installationOutboard and inboard cup options to support your bike’s spec.Sealed cartridge bearings available in both stainless and ceramic versions SPECIFICATIONSBB-frame interface T47 (Road and Road Wide) 77mmCrank-BB interface DUBBearing type StandardSpindle diameter DUBCup material Aluminum