- Prime 9 Technology for less derailleur travel and better chainline. Less wear and improved lifespan
- Box One features: Adjustable Tri-Pack limited slip clutch, forged inner and outer cage, Pivot-Tech cable stay, sealed bearing pulleys and 3D forged linkages
- Box Two features: Tri-Pack limited slip clutch, forged inner and outer cage, Pivot-Tech cable stay, sealed bushing pulleys and 3D forged linkages
- Box Three features: Limited Slip Clutch, stamped front/rear cage, direct channel cable stay and bearing pulleys
- Box Four features: 8 speed with Prime 9 technology and the same construction as Box Three
- Limited Lifetime Warranty
| Model | Box Four Prime 9, Box Three Prime 9 |
| Mount | 10x1 Standard |
| Speed | 8, 9 |
| Cage | Wide, X-Wide |
| Retention | Clutch |
| Min/Max | 11/42t, 11/50t |
| Capacity | 31t, 40t |
| Weight | 290g |
| Color | Black |
