The Sram AM Dub English/BSA 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, Sram 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.Sram AM Dub English/BSA Bottom Bracket FeaturesOne oversized spindle to work across every bottom bracket standardGutter Seal Technology™ drastically improves sealing against the elementsSignificantly lighter than GXP® systemSealed cartridge bearingsISO 4210 compliant. See Declaration of Conformity for details.