-10%
Click to zoom in
SKU: 0400.300.0550S | UPC: 803050388209
Universal Eibach ERS 4.00 in. Length x 3.00 in. ID 550 lb/in Coil-Over Spring
The Eibach ERS 4.00 in. Length x 3.00 in. ID Coil-Over Spring (part 0400.300.0550S) provides a 550 lb/in rate for consistent performance in motorsports. Designed for 3-inch ID coil-over shocks on drag cars, road racers, oval track vehicles, and custom setups. Delivers linear spring characteristics with industry-leading tolerances in height and rate.
Key Features
- Spring Rate: 550 lbs/in for predictable chassis response and handling balance in high-demand racing.
- Dimensions: 4.00 in free length x 3.00 in inside diameter fits standard coil-over assemblies.
- Material: High-tensile chrome silicon steel, shot-peened and stress-relieved for fatigue resistance.
- Production: Series manufactured with tolerances of +/- 0.2mm height and +/-1% rate for repeatable results.
- Finish: Scragged, preset, and silver powder coated for immediate use and corrosion protection.
Product Notes
- Sold as single spring; order in pairs or sets as needed for application.
- Special order item; processing time varies by manufacturer stock.
- Inspect shock perch and thread compatibility prior to installation.
Installation Notes
- Professional installation recommended.
- Compress spring with proper tool; set preload to achieve target ride height.
- Compatible with most 3.00 in ID coil-over shocks from QA1, Penske, Ohlins, and similar.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | Race & Performance Vehicles | 3 in ID Coil-Over Equipped |
Why Choose Eibach?
- Decades of motorsports involvement with parts on winning race cars globally.
- Series production ensures consistent rate and dimensions across batches.
- Engineered linear force for reliable setup tuning in racing environments.
Frequently Asked Questions
-
Q: What coil-over shocks does this spring work with?
A: Fits 3.00 in ID coil-overs including QA1, Bilstein, Fox, Penske, and custom race shocks used in drag, road, and dirt applications. -
Q: What is the spring material and treatment?
A: Made from chrome silicon steel, dual-tempered, shot-peened, nitrogen fertilized, and epoxy powder coated for durability. -
Q: What warranty coverage applies?
A: One-year limited warranty against defects in materials or workmanship under normal racing use.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: Special order - usually ships in 3-5 business days
- Packaging: Individual protective box, 5 x 5 x 5 inches
- Weight: 2.1 lbs
Coilover Springs
Coilover springs are the replaceable compression springs that wrap around the shock body in a coilover assembly, determining ride height, spring rate, and the balance between comfort and handling stiffness. Swapping springs is the most direct way to tune a coilover setup for a new application without buying an entirely new system.Popular UpgradesLinear-rate springs in the 6 to 12 kg/mm range are the most popular choice for street performance and track day builds where predictable handling is more important than maximum compliance. Progressive-rate springs that soften on small bumps and stiffen under load are preferred for street cars that need to be both comfortable on rough roads and controlled in hard cornering. ID60 and ID65 springs are the most common inner diameter specifications across popular coilover platforms.What is the difference between linear and progressive coilover springs?A linear spring has a constant rate from full droop to full compression, providing consistent an...
View Coilover Springs Products
Coilovers & Components
Browse premium coilovers and suspension components including coilover kits, coilover shocks, coilover springs, lowering springs, shock hardware, suspension boots, dampening adjustment components, and performance suspension systems for trucks, SUVs, muscle cars, off-road builds, and street performance vehicles. Shop Top Coilover & Suspension Brands Find trusted suspension brands including Silver's NEOMAX, FOX, QA1, Eibach, ICON Vehicle Dynamics, Bilstein, KW Suspension, Ohlins, Ridetech, Fabtech, and ARB/OME. These brands are known for adjustable coilovers, performance shocks, lift and lowering suspension systems, coilover springs, and suspension hardware for daily driving, off-road use, drag racing, and track-focused builds. Coilovers & Components for Street, Track & Off-Road This collection includes complete coilover kits, front and rear coilovers, coilover springs, shock boots and protective covers, dampening adjustment extenders, suspension hardware kits, lowering spr...
View Coilovers & Components Products
Eibach
Shop Eibach suspension parts at Black Ops Auto Works for lowering springs, Pro-Kit springs, Sportline springs, Pro-Truck lift kits, Pro-Truck coilovers, sway bars, anti-roll kits, wheel spacers, Pro-Spacer systems, alignment kits, camber arms, shocks, coilovers, ERS springs, off-road springs, and suspension accessories. Eibach is trusted by enthusiasts who want improved stance, sharper handling, reduced body roll, better ride control, increased ground clearance, and vehicle-specific suspension performance for cars, trucks, SUVs, EVs, and off-road builds. Use this Eibach collection to choose the right suspension upgrade by vehicle platform, ride-height goal, handling goal, and product type. Eibach Pro-Kit and Sportline springs are popular for lowering and stance, Pro-Truck lift systems support trucks and SUVs, Anti-Roll-Kits improve cornering response, Pro-Spacer systems help refine wheel fitment, and ERS springs support custom motorsport or coilover setups. Shop Eibach Suspension P...
View Eibach Products
Suspension
Aftermarket suspension systems improve handling, ride quality, and ride height adjustment beyond what the factory suspension provides. From lowering springs and coilover kits for sport handling to lift kits and leveling kits for truck and SUV off-road capability, quality suspension components transform how a vehicle rides and handles. Popular Suspension Upgrades Popular suspension upgrades include coilover kits for adjustable ride height and damping, sport lowering springs for improved handling and reduced body roll, performance shock absorbers and strut assemblies, sway bar and end link upgrade kits, subframe brace kits, and complete suspension packages for lifted trucks and off-road SUVs. Alignment kits including camber bolts and camber arms are also frequently ordered after ride height changes. What is the difference between coilovers and lowering springs? Coilovers are complete shock and spring assemblies with adjustable ride height set by threading the spring perch on the shock...
View Suspension Products