The SRAM DUB BB30 Bottom Bracket exists because a new spindle standard demands a matched bearing interface — and getting that interface right determines how smooth and long-lived your drivetrain actually feels. DUB (Durable Unified Bottom Bracket) centers on a 28.99mm spindle, a diameter that increases stiffness over slimmer designs and allows larger bearings that run with less resistance over time. This version is built specifically for BB30 shell frames, with a spacer on the right side to ensure proper chainline alignment. Installation is straightforward, and the bearing preload is designed to stay consistent across varied conditions — which matters more than it sounds on longer rides where a loose or creaking bottom bracket becomes genuinely distracting. SRAM DUB BB30 Bottom Bracket Specs at a Glance Bottom bracket standard: BB30 Spindle diameter: 28.99mm (DUB) Weight: 82g Includes: Right-side spacer for chainline alignment Compatibility: SRAM DUB cranksets
