Eibach 1200.250.0090 ERS Race Main Coilover Spring

The Eibach 1200.250.0090 is a high-performance race main spring designed for the company's world-renowned ERS (Eibach Race Spring) double-spring system. This precision-engineered coilover spring delivers the muscle needed to transform engine power into optimal track adhesion through a carefully balanced suspension setup.

ERS Double-Spring System:

The ERS system utilizes a Main and Tender spring concept that provides sophisticated rate control. When both springs compress together, the system delivers a softer initial rate for road irregularities and grip. Once the tender spring fully closes, the main spring takes over to provide the firmer ending rate needed to control body roll, squat, and dive during aggressive cornering, acceleration, and braking.

Main Spring Function:

This main spring features a linear-rate characteristic and determines the final rate of your suspension system. It works in conjunction with Eibach tender springs (sold separately) to create nearly unlimited tuning combinations from over 700 different spring components. Helper springs can also be used to prevent the main spring from becoming loose at full droop, covering up to 50mm of spring-to-perch gap.

Key Features:

• Linear-rate main spring for ERS double-spring systems
• High spring travel and deflection at short mounting lengths
• Shot-peened surface treatment for enhanced durability
• Exceptional dynamic durability and component longevity
• Precision tolerances for consistent performance
• Premium corrosion protection through phosphating and epoxy coating
• Imprinted with part number indicating spring rate and physical dimensions
• Individual protective packaging

Compatible with Eibach connecting plates (inside and outside diameter options) for secure Main-Tender spring integration. Perfect for serious racers and suspension engineers who demand precise, repeatable tuning capabilities.