SKU: 1800.300.0650S | UPC: 803050288028
Eibach ERS 18.00 in. Length x 3.00 in. ID Coil-Over Spring – 650 lb/in
Eibach ERS 1800.300.0650S is a high-performance coilover spring built for racing strut assemblies in drag, circle track, road race, and off-road vehicles. With 18-inch free length and 3-inch inner diameter, it slides over standard 3-inch coilover bodies for custom setups. Delivers firm damping control and lasting rate retention under high loads.
Key Features
- Spring Rate: 650 lb/in supports rear axle or stiff front applications with linear response for cornering grip.
- Dimensions: 18.00 in. free length x 3.00 in. ID x 0.750 in. wire dia. fits QA1, AFCO, Bilstein, and similar coilover shocks.
- Material: Chrome silicon high-tensile steel alloy resists fatigue for 100,000+ mile service life in competition.
- Manufacturing: Shot-peened, nitrogen-infused, preset, and squashed eliminates initial sag and ensures consistent performance.
- Identification: Laser-etched with rate, length, ID for quick shop identification and inventory control.
Product Notes
- Pair with matching Eibach ERS rates for balanced handling; check shock stroke clearance.
- Avoid extreme heat exposure over 250°F to maintain temper.
- Standard ground shipping; protective sleeve prevents coil damage.
Installation Notes
- Professional installation recommended.
- Compress spring with safety tool; align on threaded perches precisely.
- Works with standard flat or reduced-scrub retainers; no special hardware needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | Universal | Coilover Shocks | Drag Racing, Circle Track, Road Race, Off-Road |
Why Choose Eibach?
- Championship-proven in NHRA, NASCAR, Formula Drift since 1951.
- Tight tolerances within 2% rate accuracy for repeatable setups.
- German-engineered with motorsports testing for real-world durability.
Frequently Asked Questions
- Q: Does this spring fit specific coilover brands?
A: Yes, compatible with 3 in. ID bodies from QA1 Proma Star, AFCO, Bilstein, Fox, and custom builds; verify shock length. - Q: What finish and color is the spring?
A: Silver powder coat finish on chrome silicon steel; scrub-resistant and corrosion-protected for track storage. - Q: What warranty coverage applies?
A: Lifetime limited warranty against defects in materials or workmanship when installed per instructions.
Shipping & Handling
- Method: Standard ground
- Availability: In stock – ships same or next business day
- Packaging: Cardboard tube, 19 x 4 x 4 in.
- Weight: 5.7 lbs
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