The new SRAM DUB bottom bracket series has a simple task: to ensure that power transfer on your bike remains optimal for as long as possible. To support this, SRAM has made the DUB spindle the decisive factor. An oversized spindle that works with all bottom bracket standards. This ensures compatibility and better protection from the elements, leading to better, longer, stronger, smoother, and simpler performance. An oversized spindle that works with all BB standards. Better durability. ISO 4210 compliant.