The new SRAM bottom bracket series DUB has a very simple task: to connect the crank arms together and thereby ensure a durable power transmission into the drive. For this specific requirement, we have designed the DUB crankshaft: a single oversized shaft that works with all bottom bracket standards. For better crank compatibility, better protection from the elements and long-lasting performance - more stable, smoother, simpler. And now back on the bike! - Purpose: Road bike - Details: - Oversized shaft that works with all bottom bracket standards - Significantly better sealing by Gutter Seal Technology - Significantly lighter than the GXP system - Industrial bearings - Type: Hollow axle - Frame compatibility: BB30 bottom bracket - Type: pressed bearing shells axle - Axle mount: DUB (28.8 mm).