Description
The FOX® 883-26-273 Performance Elite Series 2.5 Reservoir Rear Shocks are an adjustable, application-specific bolt-on shock pair with external reservoirs and DSC EVO compression adjusters, engineered for the 2024-2026 INEOS Grenadier and 2025-2026 INEOS Grenadier Quartermaster.
IMPORTANT: This listing is for the REAR shock pair (2 shocks) only — it does not include front shocks, which are a separate part number. This pair includes the resi-to-body clamp per FOX’s specifications. This shock pair is designed for a 0″-2″ lift height range — do not install on a vehicle outside this range without confirming compatibility.
FOX® Performance Elite Series 2.5 shocks with DSC EVO are a bolt-on suspension upgrade tuned specifically for the INEOS Grenadier platform. They are designed to optimize on- and off-road performance without compromising the vehicle’s OEM reliability and handling behavior.
The shock body is a 2.5″ impact-extruded and CNC-machined 6061-T6 aluminum body with Type III hard anodizing to resist corrosion and wear. The external reservoir increases oil capacity, allows additional shock stroke to preserve available travel, and reduces the harshness associated with nitrogen ramp-up as the shock compresses. Each reservoir carries a Dual Speed Compression Evolution (DSC EVO) adjuster, positioned to clear aggressive tires at full steering lock.
DSC EVO uses Variable Valve Control (VVC) on the high-speed compression circuit. Rather than adding preload to the shim stack to increase high-speed damping, VVC keeps the high- and low-speed circuits independent, which improves comfort and increases capacity for large impacts. This allows the compression adjuster to be tuned for additional high-speed control without sacrificing small-bump sensitivity.
Internally, each shock uses a race-developed high-flow piston and application-specific valving, a 7/8″ hard chrome-plated, heat-treated alloy steel shaft, and PTFE-lined, heat-treated alloy steel spherical bearings at the mounts. A redundant sealing pack — main seal, wiper seal, and scraper seal — protects against contamination on each unit. FOX backs this shock pair with its suspension product warranty covering manufacturing defects.
- Fits Rear position on 2024-2026 INEOS Grenadier and 2025-2026 INEOS Grenadier Quartermaster, 0″-2″ lift height
- 2.5″ impact-extruded and CNC-machined 6061-T6 Type III hard-anodized aluminum body
- External reservoir with DSC EVO (Dual Speed Compression Evolution) adjuster
- Variable Valve Control (VVC) on the high-speed compression circuit for independent high/low-speed tuning
- 7/8″ hard chrome-plated, heat-treated alloy steel shaft
- Race-developed high-flow piston with application-specific valving
- PTFE-lined, heat-treated alloy steel spherical bearings; redundant main/wiper/scraper sealing pack
- Includes resi-to-body clamps
- Backed by FOX’s suspension product warranty
- Sold as a pair (2 shocks)
| Part Number | 883-26-273 |
| Series | Performance Elite |
| Position | Rear |
| Body Diameter | 2.5″ |
| Reservoir Type | External, with DSC EVO adjuster |
| Travel | 8.58″ |
| Body | 2.5″ impact-extruded and CNC-machined 6061-T6 hard-anodized aluminum |
| Body Plating | Hard-anodized for a durable finish |
| Components | Black-anodized, CNC-machined 6061-T6 billet aluminum |
| Shaft | 7/8″ hard chrome-plated, heat-treated alloy steel |
| Piston | Race-developed high-flow piston design |
| Valving | Application-specific valving |
| Seals | Redundant sealing pack: main seal, wiper seal, scraper seal |
| Bearings | PTFE-lined, heat-treated, alloy steel spherical |
| Extended Length | 23.48″ |
| Compressed Length | 14.9″ |
| Top Mount | Eyelet |
| Bottom Mount | Eyelet |
| Fitment Notes | Includes resi-to-body clamps |
| What’s Included | (2) FOX Performance Elite Series 2.5 Reservoir Rear Shocks; resi-to-body clamps |
This shock pair is application-specific to the INEOS Grenadier platform’s rear axle, built around a 2.5″ reservoir body with a DSC EVO compression adjuster and a 0″-2″ lift height range. Coverage spans 2024-2026 INEOS Grenadier and 2025-2026 INEOS Grenadier Quartermaster. This listing is for the REAR shock pair only — the front shocks for this application are a separate part number.