Eibach 1200.250.0400 ERS Race Main Coilover Spring

The Eibach ERS (Eibach Race Spring) main coilover spring is a precision-engineered linear-rate spring designed for high-performance racing and track applications. This spring serves as the foundation of Eibach's renowned double-spring system, which allows suspension tuners to achieve optimal balance between compliance and control.

ERS Double-Spring System:

The ERS system utilizes a Main and Tender spring configuration that delivers a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully compresses. The Main spring determines the final rate of the system with its linear-rate characteristic, while Tender springs (sold separately) control the initial rate and can feature linear or progressive characteristics.

Key Features:

• Linear-rate spring design for predictable, consistent performance
• High spring travel and deflection capability with short mounting lengths
• Shot-peened surface treatment for superior fatigue resistance
• Precision manufacturing with tight tolerances for accurate spring rates
• Phosphate and epoxy coating for exceptional corrosion protection
• Part number imprinted on spring indicates rate and physical dimensions
• Compatible with over 700 ERS components for custom tuning combinations
• High dynamic durability for extended component longevity

Application Notes:

This Main spring is designed to work with Eibach ERS Tender springs for dual-rate suspension setups, or with Helper springs to prevent spring unseating at full droop (up to 50mm of perch gap). Connecting plates (sold separately) are available in inside and outside diameter configurations to attach Main and Tender springs on various damper types.

Professional-grade suspension component used by racing teams and serious enthusiasts for precise suspension tuning and optimization.