Radflo 2.5 Remote Reservoir + Eibach Spring Package • 16" Travel • 2 Shocks + 4 Springs
The Radflo 2.5 Remote Reservoir + Eibach Spring Package combines two 16" travel Radflo coilover shocks with four 16" Eibach coilover springs for a complete dual-rate off-road suspension setup. Featuring 2.5" shock bodies, heavy-duty 7/8" Nitro Steel shafts, and remote reservoirs, these coilovers provide increased oil capacity and consistent damping during demanding trail use, rock crawling, and off-road racing.
Each Radflo coilover features a Freeflo Racing Piston, velocity-sensitive valving, and adjustable dual-rate spring hardware for suspension tuning. The package includes two upper and two lower Eibach 16" x 3.0" ID coilover springs, allowing separate spring rates to be selected for each position. Adjustable spring preload and crossover hardware allow builders to tune ride height and the dual-rate spring transition, while the fully rebuildable and revalvable shocks provide long-term serviceability.
Includes:
- (2) Radflo 2.5 Remote Reservoir Coilover Shocks – 16" Travel
- (2) Eibach Upper Coilover Springs – 16" Length x 3.0" ID
- (2) Eibach Lower Coilover Springs – 16" Length x 3.0" ID
- Dual-Rate Spring Hardware Included with Radflo Shocks
- Remote Reservoir Assemblies
- Universal Spherical Bearings & Mounting Hardware
Spring Rate Selection: Select your desired upper and lower Eibach spring rates from the available options. Both upper springs will be supplied in the selected upper rate, and both lower springs will be supplied in the selected lower rate.
Shipping & Assembly: This package ships with the Radflo shocks and Eibach springs packaged separately. Springs are not installed on the shocks. Assembly and suspension setup are required.
Availability: Wide Open Design stocks a selection of Radflo shocks and Eibach springs. Some spring rates, custom valving configurations, and special-order components may require additional production time.
Need help selecting spring rates or confirming availability? Call Wide Open Design for suspension setup assistance.
Specifications
Package Specifications
| Package Type | Radflo Dual-Rate Coilover Shock & Eibach Spring Package |
|---|---|
| Shock Manufacturer | Radflo Suspension Technology |
| Spring Manufacturer | Eibach |
| Shock Quantity | (2) Coilover Shocks |
| Spring Quantity | (4) Coilover Springs |
| Spring Configuration | Dual-Rate / Two Springs Per Shock |
| Spring Rate Selection | Customer Selected Upper & Lower Rates |
| Spring Rate Matching | Both Upper Springs Match; Both Lower Springs Match |
| Spring Hardware | Dual-Rate Hardware Included |
| Assembly | Shocks & Springs Shipped Unassembled |
| Primary Application | Custom Off-Road Dual-Rate Coilover Suspension |
Radflo 2.5 Remote Reservoir Coilover Specifications
| Manufacturer | Radflo Suspension Technology |
|---|---|
| Part Number | 6CR-005-00 |
| Shock Type | Remote Reservoir Coilover |
| Shock Body Diameter | 2.5" |
| Shock Travel | 16" |
| Extended Length | 39.76" |
| Compressed Length | 23.78" |
| Shaft Diameter | 7/8" (0.875") |
| Shaft Material | Nitro Steel |
| Shaft Finish | Mirror Polished |
| Reservoir Type | Remote Reservoir |
| Body Material | SSID Alloy Steel Tube |
| Body Finish | Clear Cadmium Plating |
| Body Caps / Eyelets | CNC-Machined 6061 Aluminum |
| Body Cap Finish | Black Anodized |
| Rod Guide | CNC-Machined Bronze with PTFE Coating |
| Coilover Hardware | Adjustable Spring Preload, Spring Slider & Dual-Rate Crossover Hardware |
| Piston | Radflo Aluminum Freeflo Racing Piston |
| Seal System | Quad-Ring & Lip Seal |
| Valving Type | Velocity-Sensitive Deflective Disc |
| Valving Tuning | Consumer or Factory Tunable |
| Suspension Fluid | High-Temperature Foam-Resistant Suspension Fluid |
| Pressurization | Nitrogen Gas |
| Mounting | Universal Spherical Bearings & Hardware |
| Serviceability | Fully Rebuildable & Revalvable |
Eibach Coilover Spring Specifications
| Manufacturer | Eibach |
|---|---|
| Spring Series | 1600.300 |
| Spring Type | Linear-Rate Coilover Springs |
| Spring Configuration | Dual-Rate / Upper & Lower Springs |
| Spring Inside Diameter | 3.0" |
| Upper Spring Length | 16" |
| Lower Spring Length | 16" |
| Upper Spring Quantity | (2) |
| Lower Spring Quantity | (2) |
| Available Spring Rates | 75–500 lb/in |
| Upper Spring Rate | Customer Selected |
| Lower Spring Rate | Customer Selected |
| Spring Rate Matching | Both Upper Springs Match; Both Lower Springs Match |
| Spring Material | High-Tensile Chrome Silicon Alloy Spring Steel |
| Manufacturing | Shot Peened & Pre-Set |
Available Eibach Spring Rates
| Spring Rate | Eibach Part Number |
|---|---|
| 75 lb/in | 1600.300.0075S |
| 100 lb/in | 1600.300.0100S |
| 125 lb/in | 1600.300.0125S |
| 150 lb/in | 1600.300.0150S |
| 175 lb/in | 1600.300.0175S |
| 200 lb/in | 1600.300.0200S |
| 225 lb/in | 1600.300.0225S |
| 250 lb/in | 1600.300.0250S |
| 300 lb/in | 1600.300.0300S |
| 350 lb/in | 1600.300.0350S |
| 400 lb/in | 1600.300.0400S |
| 450 lb/in | 1600.300.0450S |
| 500 lb/in | 1600.300.0500S |
Spring Selection Note: Each shock uses one upper and one lower 16" Eibach spring. Upper and lower spring rates may differ, but both shocks receive matching spring combinations.
Fitment
Universal Fitment for Custom Off-Road Suspension Systems
This package is intended for custom front or rear coilover suspension applications requiring 16" travel Radflo 2.5 remote reservoir shocks and a dual-rate Eibach spring configuration.
Common Applications:
- Long-Travel Rock Crawlers & Rock Bouncers
- Ultra4 Race Cars
- Custom Tube-Chassis Buggies
- Jeep Suspension Builds
- Trail Rigs & Off-Road Trucks
- Linked Front & Rear Suspension Systems
- Custom Long-Travel Suspension Builds
Fitment & Installation Notes:
- Universal coilover package requiring custom suspension mounting and setup.
- Includes two 16" travel shocks and four 16" long, 3.0" ID Eibach springs.
- Each shock uses one upper spring and one lower spring.
- Both upper springs match the selected upper rate; both lower springs match the selected lower rate.
- Verify 39.76" extended length, 23.78" compressed length, mounting dimensions, and chassis clearance before ordering.
- Spring rates must be selected for vehicle weight, shock angle, suspension motion ratio, and intended ride height.
- Confirm available preload adjustment, spring slider travel, and crossover positioning.
- Cycle the suspension to verify chassis, tire, axle, driveshaft, and suspension link clearance.
- Route remote reservoir hoses away from exhaust heat, tires, steering components, and moving suspension parts.
- Proper bump stop placement is required to prevent shocks from becoming the suspension's compression limit.
- Custom shock tabs, mounting brackets, and chassis fabrication may be required.
- Shocks and springs ship unassembled and require installation and suspension setup.
FAQ
What is included in this Radflo and Eibach dual-rate coilover package?
The package includes two Radflo 2.5 remote reservoir coilover shocks with 16" travel, four Eibach 16" x 3.0" ID coilover springs, remote reservoir assemblies, dual-rate spring hardware, spherical bearings, and mounting hardware.
How do I select my upper and lower Eibach spring rates?
Select your desired upper and lower spring rates from the available options. Both upper springs will be supplied in the selected upper rate, and both lower springs will be supplied in the selected lower rate. Available spring rates range from 75 to 500 lb/in.
What is the difference between a two-spring and four-spring package?
The two-spring package includes one spring per shock for a single-spring configuration. This four-spring package includes two springs per shock, allowing a complete dual-rate spring setup with independently selected upper and lower rates.
How does a dual-rate coilover suspension work?
A dual-rate coilover uses two springs separated by a spring slider. During initial suspension compression, both springs work together to provide a softer combined rate. Adjustable crossover stops can then transition the suspension to the lower spring's rate deeper in the stroke.
Do the shocks and springs arrive assembled?
No. The Radflo shocks and Eibach springs are packaged separately. Springs are not installed on the shocks, and assembly and suspension setup are required.
Why choose a remote reservoir coilover?
A remote reservoir increases oil and gas capacity while separating the nitrogen charge from the damping fluid. This helps manage heat and maintain more consistent damping during repeated suspension cycling and extended off-road use.
How do I know if 16" travel is correct for my suspension?
Shock travel must match the suspension's measured compression and droop requirements. The Radflo 16" shock has a published extended length of 39.76" and compressed length of 23.78". Verify mounting geometry and available clearance before ordering.
Can ride height and dual-rate crossover be adjusted?
Yes. The Radflo coilovers include adjustable spring preload and dual-rate crossover hardware, allowing builders to tune ride height and the spring rate transition within the limits of the suspension design.
Can the Radflo shocks be rebuilt or revalved?
Yes. Radflo 2.5 remote reservoir coilovers are fully rebuildable and revalvable. Compression and rebound valving can be tuned to match vehicle weight, spring configuration, suspension geometry, and intended driving conditions.
How do I calculate the correct coilover spring rates?
Spring selection depends on sprung vehicle weight, shock angle, suspension motion ratio, and desired ride height. Watch our spring rate calculation guide for help understanding coilover spring selection.
