Eibach 1200.250.0350 ERS Race Main Coilover Spring 12" x 2.5" ID 350 lb/in

The Eibach ERS (Eibach Race Spring) Main Spring is engineered for precise suspension tuning in racing and high-performance applications. This linear-rate coilover spring delivers the muscle needed to transform engine power into optimal track adhesion through a properly balanced suspension system.

ERS Double Spring System:

This Main Spring is a key component of Eibach's renowned ERS double-spring system, which combines Main and Tender springs to create a sophisticated suspension response. The system provides 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 offers nearly unlimited tuning combinations for suspension engineers and enthusiasts.

Key Features:

• Linear-rate characteristic determines the final rate of the suspension system
• High spring travel and deflection capability with short mounting lengths
• Block resistance for maximum durability under extreme loads
• Surface treated through shot-peening for enhanced fatigue resistance
• Superior dynamic durability for extended component longevity
• Manufactured to precise tolerances for consistent performance
• Advanced corrosion protection through phosphating and epoxy coating
• Part number imprinted directly on spring indicating spring rate and physical dimensions
• Compatible with Helper springs to prevent looseness at full droop
• Works with Eibach Connecting Plates for multi-spring configurations

This Main Spring maintains constant tension in the spring seat and provides the firm, predictable response needed to control body roll, squat, and dive during aggressive cornering, acceleration, and braking. The high-quality construction and precision engineering make this an essential component for serious suspension tuning.