Eibach 0500.225.0450 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 applications. This spring serves as the primary component in Eibach's renowned ERS double-spring system, which combines Main and Tender springs to create a progressive suspension setup that balances initial compliance with firm control during aggressive driving.

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 compresses. The Main spring features a linear-rate characteristic and determines the final rate of the system, while Tender springs (sold separately) are available in linear-rate or progressive-rate options to tune the initial response. This configuration allows suspension engineers and enthusiasts to fine-tune handling characteristics by selecting from over 700 different spring components to create nearly unlimited combinations.

Key Features:

• Linear-rate main spring for predictable, consistent performance
• Compatible with Eibach ERS Tender springs and Helper springs for customizable suspension tuning
• High spring travel and deflection capability with short mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Precision manufacturing with tight tolerances for consistent performance
• Advanced corrosion protection through phosphating and epoxy coating
• Part number imprinted on spring indicating spring rate and physical dimensions for easy identification
• Block resistance for durability under extreme compression
• Individual protective packaging to prevent damage during storage and shipping

This Main spring is designed to work with Eibach Connecting Plates (sold separately) when paired with Tender springs in a double-spring configuration. The ERS system is ideal for road racing, autocross, time attack, and other motorsport applications where precise suspension tuning is critical for optimal tire contact and vehicle balance during cornering, acceleration, and braking.