Eibach 0700.225.0500 ERS Race Main Coilover Spring

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

ERS Double-Spring System:

The ERS system uses a Main and Tender spring concept that delivers a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully closes. 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 be selected in linear or progressive configurations.

Key Features:

• Linear-rate characteristic for predictable, consistent performance
• Compatible with over 700 ERS spring components for unlimited tuning combinations
• High spring travel and deflection capability at compact mounting lengths
• Surface treated through shot-peening for enhanced fatigue resistance
• Precision tolerances for consistent performance
• Phosphate and epoxy coating for superior corrosion protection
• Part number imprinted on spring indicating spring rate and dimensions
• Exceptional dynamic durability for extended component life
• Block resistance to prevent coil binding

This Main spring can be paired with Eibach Tender springs and connecting plates to create a custom-tuned suspension system. Helper springs (sold separately) can also be used to prevent the Main spring from becoming loose at full droop, covering up to 50mm of spring-to-perch gap without affecting suspension characteristics.