Eibach 0500.225.0500 ERS Race Main Coilover Spring

The Eibach 0500.225.0500 is a high-performance race main spring designed for Eibach's renowned ERS (Eibach Race Spring) double-spring system. This precision-engineered coilover spring delivers the critical balance between compliance and control needed to transfer engine power to the track through optimum tire adhesion.

ERS Double-Spring System Technology:

This main spring works as part of Eibach's innovative ERS system, which combines main and tender springs to provide superior tuning flexibility. The system delivers a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully closes. With over 700 different spring components available, the ERS system enables nearly unlimited suspension tuning combinations for professional racing teams and dedicated enthusiasts alike.

Key Features:

• Linear-rate characteristic that determines the final rate of the complete spring system
• Shot-peened surface treatment for enhanced fatigue resistance
• High spring travel and deflection capability at compact mounting lengths
• Superior block resistance for consistent performance under extreme loads
• Exceptional dynamic durability for extended component longevity
• Manufactured to precise tolerances for predictable suspension behavior
• Premium corrosion protection through phosphating and epoxy coating
• Clearly marked with part number indicating spring rate and physical dimensions
• Individual protective packaging to prevent damage during shipping and storage

Designed for use with Eibach tender springs, helper springs, and connecting plates, this main spring allows suspension engineers to fine-tune compression and rebound characteristics for specific track conditions, vehicle weight distribution, and driving styles. The result is optimized body roll control, reduced squat and dive, and consistent road contact through corners, acceleration, and braking zones.