SRAM's DUB (Durable Unifying Bottom bracket) standard uses a unique 28.99mm spindle diameter — and our BSA DUB BB is engineered specifically for it. Grade 3 silicon nitride ceramic balls with DLC-coated races in precision-machined aluminum cups. No adapter sleeves, no play, no compromise. Threads directly into any standard 68mm BSA shell. The lowest-friction DUB bottom bracket you can buy at any price.
What You Get
- ✓ Purpose-built for SRAM DUB 28.99mm spindle — no adapters
- ✓ Grade 3 Si₃N₄ ceramic balls with DLC-coated races
- ✓ Precision-machined 6061 aluminum cups, black anodized
- ✓ Dual-lip seals for all-weather protection
- ✓ Standard BSA thread — installs with any BB tool
- ✓ Zero preload adjustment needed — set and forget
Technical Specifications
| Weight |
80g |
| Seal Type |
Dual-lip contact seals |
| Tolerance |
ABEC-7 |
| Cup Material |
6061-T6 Aluminum, anodized |
| Expected Life |
20,000–30,000 miles |
| Race Material |
52100 Chromium Steel, DLC Coated |
| Shell Standard |
BSA (English thread, 68mm) |
| Bearing Material |
Grade 3 Silicon Nitride (Si₃N₄) |
| Spindle |
28.99mm (SRAM DUB) |
Compatibility
SRAM Red AXS
SRAM Force AXS
SRAM Rival AXS
SRAM RED / Force / Rival eTap
SRAM Apex
Any SRAM DUB crankset