The SRAM DUB bottom bracket series has one clear mission—connect your crankarms and ensure smooth, durable power delivery to your drivetrain. To achieve this, we designed the DUB spindle as a single, oversized component that fits all bottom bracket standards. This means better crankarm compatibility, improved protection against the elements, and longer-lasting performance. Stronger, smoother, simpler—so you can get back to what matters: the ride.