Sram: singular focus. Better solution.The new SRAM dubbottom bracket series has a simple jobconnect your crankarms and protect the smooth, long-lasting application of power to your drivetrain. To allow that singular focus, weve engineered the dubspindle 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.Things to rememberone oversized spindle to work across every bottom bracket standard.significantly lighter than pfgxp systemeasier installation by allowing you to press the bearing cups into the framefeatures and benefitseasy installationtwo fully sealed cartridge bearingsiso 4210 compliant.Specificationsbb-frame interface:press fit (mtb: 89/92mm)crank-bb interface: dubbearing type: standardspindle diameter: dubcup material: steel