SRAM s new DUB bottom brackets are lighter, stiffer and more durable in comparison to previous designs. It offers better protection from the elements and therefore will keep running smoothly for longer.One oversized spindle to work across every bottom bracket standardSignificantly lighter than PFGXP systemEasier installation by allowing you to press the bearing cups into the frame One oversized spindle to work across every bottom bracket standardThe new DUB bottom brackets have one oversized spindle to work across every bottom bracket standard for better crankarm compatibility.  The relationship between the bottom bracket spindle and bearing is the core of DUB technology. It provides more stiffness and durability. Its made everything simpler and the result is better drivetrain performance.