Sram: singular focus. Better solution.The new SRAM dubbottom 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 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 standardgutter seal technologydrastically improves sealing against the elementssignificantly lighter than gxp® systemfeatures and benefitsgutter seal technologysealed cartridge bearingsiso 4210 compliant. See declaration of conformity for details.Specificationsbb-frame interfaceenglish/bsa 100mm, english/bsa 73mm, english/bsa 83mmcrank-bb interfacedubbearing typestandardspindle diamete