Eibach 0800.250.0400 ERS Race Main Coilover Spring

The Eibach ERS (Eibach Race Spring) system delivers professional-grade suspension tuning through precision-engineered coilover springs. This race main spring is designed to transform engine power into optimal track adhesion by maintaining the critical balance between compliance and control—soft enough to maintain constant road contact over irregularities, yet firm enough to minimize body roll, squat, and dive during aggressive driving.

ERS Double Spring System:

This main spring is part of Eibach's renowned ERS double-spring system, which combines main and tender springs to create a dual-rate suspension characteristic. The linear-rate main spring determines the final system rate, while tender springs control the initial softer rate until they fully compress. This configuration provides superior versatility for fine-tuning suspension response across different track conditions and driving styles.

Key Features:

• Linear-rate race main spring for precise suspension control
• Compatible with over 700 ERS components for unlimited tuning combinations
• High deflection capacity delivers maximum load capacity at short mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Precision manufacturing with tight tolerances for consistent performance
• Phosphate and epoxy coating provides superior corrosion protection
• Part number imprinted on spring indicates rate and physical dimensions
• Designed for use with connecting plates to attach tender springs
• Individually packaged for protection during storage and transport

Engineered for racing applications and high-performance street use, this ERS main spring delivers the dynamic durability and precision required for serious suspension tuning. Works with Eibach helper springs to prevent spring unseating at full droop and with tender springs to create custom dual-rate setups.