Eibach ERS 4.00 in. Length x 2.25 in. ID Coil-Over Spring, 1,800 lb/in Rate - 0400.225.1800

Eibach's ERS line has evolved over the years to be the world's most prominent, comprehensive and superior Race Spring System. Eibach Race Springs are all manufactured in series production, often repeated, with a strong manufacturing experience. Thus, Eibach constantly achieves the most linear spring characteristic (rate) while maintaining the lowest tolerances and the highest quality in the industry.

The Eibach ERS Coil-Over Spring is engineered for serious race and high-performance suspension applications. Built around Eibach’s established Race Spring System, this coil-over spring delivers a highly consistent spring rate and predictable suspension response for drivers, builders, and race teams who demand precise vehicle control. The spring is designed for compatible coil-over assemblies using a 2.25-inch inside diameter and a 4.00-inch free length.

Manufactured in repeated series production, the Eibach ERS spring benefits from controlled manufacturing processes, consistent materials, and extensive spring-production experience. Its 1,800 lb/in rate is suited to applications requiring substantial suspension support, helping maintain chassis control under heavy cornering, braking, acceleration, and aerodynamic loads. The linear spring characteristic provides more predictable performance throughout the working range, making suspension setup and tuning more repeatable.

Part number 0400.225.1800 is intended for motorsport and specialized performance use. Confirm coil-over compatibility, installed height, travel requirements, spring rate selection, and suspension clearance before installation. This universal race spring does not identify vehicle-specific fitment, so professional suspension setup is recommended. The Eibach ERS system is designed to help users fine-tune vehicle balance and handling through accurately selected spring rates.

Product Specifications and Technical Data

• Brand: Eibach
• Part Number: 0400.225.1800
• Product Line: ERS Race Spring System
• Spring Type: Coil-over race spring
• Free Length: 4.00 inches
• Inside Diameter: 2.25 inches
• Spring Rate: 1,800 lb/in
• Application: Universal motorsport and performance suspension use

What’s Included

• One Eibach ERS coil-over spring

Fitment data should be verified against the vehicle, coil-over hardware, suspension design, and intended racing application before purchase. This product is not identified as vehicle-specific.

Features:

• Linear spring characteristic: Delivers predictable suspension response and consistent handling behavior across the working range.
• 1,800 lb/in spring rate: Provides substantial support for demanding race and high-performance suspension setups.
• Precision manufacturing: Produced in repeated series production to maintain consistent rates and tight manufacturing tolerances.
• Race-focused ERS design: Supports accurate suspension tuning for coil-over systems used in motorsport and performance applications.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false