Eibach 1800.300.0650S ERO 18" x 3" ID 650 lb/in Off-Road Coilover Spring Silver

Vehicle Fitment

• Universal - fits any coilover shock or suspension system with a 3.000 in. (76mm) inside diameter spring perch
• Purpose-built for extreme long-travel off-road coilover applications including desert racing, prerunner truck suspension, high-speed off-road racing, and heavy-duty overlanding builds
• Compatible with bypass shocks, remote-reservoir coilovers, and extended long-travel race suspension accepting a 3.00 in. ID spring at 18 in. free length

Fitment Notes

• Confirm your coilover's spring perch inside diameter matches 3.000 in. (76mm) before ordering - this is the primary fitment dimension
• Verify that an 18.000 in. free length and 650 lb/in. rate suit your coilover's designed travel range, desired ride height, and vehicle corner weight
• Sold individually - order two for a complete front or rear axle replacement
• The 650 lb/in. rate at 18 in. free length is engineered for applications requiring both maximum stroke and significant spring resistance - typically heavy vehicles or high-speed desert race suspension with 9+ inches of travel

Features

• ERO (Eibach Race Off-Road) series - engineered specifically for the elevated shock loads, high-frequency inputs, and extreme travel demands of off-road racing and heavy-duty recreation
• Manufactured from Eibach's proprietary Hi-Ten spring steel alloy for exceptional fatigue resistance under repeated high-impact loading
• CNC precision winding process ensures the highest linearity and rate consistency across the full 9.02 in. of available travel
• Each spring is individually tested and certified to its stated 650 lb/in. rate before leaving the factory
• Delivers 9.02 in. of travel with one of the smallest block heights available for an 18 in. off-road spring
• Silver powdercoat finish engineered for off-road environments - corrosion-resistant and highly visible for inspection in the field
• Trusted by professional off-road race teams competing in desert racing, rally raid, and extreme off-road events worldwide
• Backed by Eibach's Five-Year Limited Warranty against factory defects in material and workmanship

Specifications

• Part Number: 1800.300.0650S
• Series: ERO (Eibach Race Off-Road)
• Free Length: 18.000 in. (457mm)
• Inside Diameter: 3.000 in. (76mm)
• Spring Rate: 650 lbs/in. (11.61 kg/mm / 114 N/mm)
• Block Height: 8.980 in. (228mm)
• Spring Travel: 9.020 in. (229mm)
• Load at Block Height: 5,873 lbs (26,124 N)
• Color: Silver Powdercoat
• Weight: 15.77 lbs (7.15 kg)
• Quantity: Sold Individually (each)

Included Components

• 1x Eibach ERO Off-Road Coilover Spring (18.000 in. x 3.000 in. ID x 650 lbs/in.) - Silver

Product Description

The Eibach 1800.300.0650S is an 18-inch, 650 lb/in. coilover spring from Eibach's ERO (Eibach Race Off-Road) series - the longest commonly available configuration in the 3.00" ID, 650 lb/in. ERO lineup. With 9.02 inches of usable travel before reaching block height, this spring is designed for coilover setups that demand both extended stroke and substantial spring resistance in one package: desert race vehicles with long-travel bypass shock systems, heavy prerunner trucks, and purpose-built off-road platforms where corner loads routinely challenge shorter springs. The 5,873 lb load capacity at block height reflects the spring's readiness for the most demanding real-world off-road impacts.

Like all Eibach ERO springs, the 1800.300.0650S is wound from proprietary Hi-Ten spring steel on CNC machinery, then individually tested and certified to its stated rate. The silver powdercoat is the hallmark of the ERO off-road line - durable in mud, water, and abrasive environments and easily identified during post-run inspection. Order two for a complete axle set, and consult your shock manufacturer or suspension tuner to confirm the right spring rate and length for your specific vehicle weight and shock travel. For shorter configurations at the same 650 lb/in. rate, see the 1400.300.0650S (14 in.) and 1600.300.0650S (16 in.).