The SRAM DUB Ceramic bottom bracket connects your crankarms and protects the smooth, long-lasting application of power to your drivetrain. The DUB spindle is a unifying component, working across every bottom bracket specification for better crankarm compatibility, enhanced protection from the elements, and longer-lasting performance. It is stronger, smoother, and simpler. Specifications: Bearing Type: Ceramic Features Gutter Seal Technology™ seals against the elements. Significantly lighter than the GXP® system. Sealed cartridge bearings available in both stainless and ceramic versions. Available Sizes: BSA, ITALIAN, PRESSFIT 30 ROAD, BB30 ROAD, T47 ROAD. Purpose: MTB / Road Bearing bushing material: aluminium