The new SRAM DUB™ bottom bracket series has a simple task - connect your crank arms and protect the smooth, long-lasting power transmission to your drivetrain. To enable this unique focus, we have developed the DUB™ spindle as the only truly unifying component. An oversized spindle that works across any bottom bracket standard. For better crank arm compatibility. For better protection from the elements. For longer lasting performance. To be stronger, smoother and easier. Now, back to the ride. - Frame compatibility: BSA - Intended use: MTB - Details: - Significantly lighter than the GXP® system - Sealed cartridge bearings - Type: Hollow axle - Installation width: 83 mm (approx.) Bottom bracket - Type: Bolted bearing shells axle - Axle mount: DUB (28.8 mm).