SKU: 1800.300.0450S | UPC: 803050288073
Eibach ERS 18.00 in. Length x 3.00 in. ID Coil-Over Spring – 450 lb/in Rate, Universal Racing Fit
Eibach ERS 1800.300.0450S is a high-performance coil-over spring designed for racing and custom suspension setups. With 18-inch free length and 3-inch inside diameter, it fits most coil-over shocks from QA1, Bilstein, Fox, and similar systems. This 450 lb/in linear rate spring delivers consistent damping response and stability under high loads for drag, road course, or off-road use.
Key Features
- 450 lb/in Spring Rate: Provides firm resistance for sharp cornering and high-speed stability in demanding track conditions.
- 18.00 in. Free Length x 3.00 in. ID: Exact dimensions ensure drop-in compatibility with standard coil-over strut housings and perches.
- Chrome Silicon Steel Alloy: High-tensile material resists fatigue for extended service life in motorsport environments.
- Shot-Peened and Preset: Increases surface strength and eliminates initial sag for reliable performance from lap one.
- Squared/Ground Ends & Silver Powder Coat: Ensures secure shock contact and corrosion protection for long-term durability.
Product Notes
- Verify shock perch spacing matches 3 in. ID before installation.
- Inspect for proper seating after 100 miles or 5 heat cycles.
- Ships individually wrapped; store vertically to maintain shape.
Installation Notes
- Professional installation recommended.
- Lubricate ends with silicone spray for smooth assembly on threaded bodies.
- Compatible with standard flat or bearing mount coil-over perches; torque to shock manufacturer specs.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | Universal | Coil-Over Shocks | 3 in. ID Applications (QA1, Bilstein, Fox, AFCO) |
Why Choose Eibach?
- Proven in NASCAR, Formula Drift, and global racing series.
- Precision-wound tolerances hold rate within 2% variation.
- German-engineered with USA manufacturing for consistent quality.
Frequently Asked Questions
- Q: What coil-over shocks does this spring fit?
A: Fits any coil-over with 3.00 in. ID perch, including QA1 Proma Star, Bilstein 5125, Fox 2.0, and AFCO drag struts. Confirm free length clearance. - Q: What material and finish are used?
A: Chrome silicon high-tensile steel with silver epoxy powder coat for rust resistance and shot-peened for 200% longer fatigue life. - Q: What is the warranty and break-in process?
A: Lifetime guarantee against sag or failure when used as directed. Cycle 5 times unloaded before track use.
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Protective cardboard tube, 19 x 4 x 4 in.
- Weight: 6.6 lbs
Reviews
There are no reviews yet.