Eibach 1400.250.0090 ERS Race Main Coilover Spring

The Eibach ERS (Eibach Race Spring) Main Spring is a precision-engineered linear-rate coilover spring designed for racing applications and performance suspension systems. This high-quality coil spring serves as the foundation of Eibach's renowned double-spring system, delivering the firm final spring rate needed for competitive motorsports while maintaining optimal tire contact and handling characteristics.

ERS Double-Spring System:

The ERS system utilizes a Main and Tender spring concept that provides superior suspension flexibility. When combined with a Tender spring, the system delivers a softer initial rate as both springs compress together, then transitions to the firmer Main spring rate once the Tender spring fully compresses. This dual-rate characteristic allows precise tuning of suspension behavior during different driving conditions—providing compliance over road irregularities while controlling body roll, squat, and dive during aggressive cornering, acceleration, and braking.

Key Features:

• Linear-rate spring characteristic that determines the final system rate
• Compatible with over 700 ERS components for virtually unlimited tuning combinations
• High spring travel and deflection capability at compact mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Superior dynamic durability and component longevity
• Manufactured to precise tolerances for consistent performance
• Advanced corrosion protection through phosphating and epoxy powder coating
• Part number imprinted on spring indicating spring rate and physical dimensions
• Block resistance to prevent coil binding
• Individually packaged for protection

Application Notes:

This Main spring is designed to work with Eibach ERS Tender springs, Helper springs, and Connecting Plates (sold separately). Helper springs can be used to prevent the Main spring from becoming loose in the spring seat at full droop, covering up to 50mm of spring-to-perch gap without affecting suspension characteristics. Connecting Plates are available in both inside and outside diameter configurations depending on damper specifications.

The Eibach ERS system is the choice of suspension engineers and racing enthusiasts worldwide, offering unmatched performance and tuning flexibility for circuit racing, time attack, autocross, and high-performance street applications.