Eibach 0700.250.0400 ERS Race Main Coilover Spring 2.5" ID 400 lb/in

The Eibach ERS (Eibach Race Spring) main coilover spring is a precision-engineered linear-rate spring designed for motorsport and high-performance suspension applications. This component is part of Eibach's renowned ERS double-spring system, which allows suspension tuners to create customized spring rate combinations for optimal vehicle dynamics.

ERS Double-Spring System:

The ERS system utilizes a main spring and tender spring concept that provides a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully closes. The main spring features a linear-rate characteristic and determines the final rate of the suspension system. With over 700 different components available, the ERS system offers virtually unlimited tuning possibilities.

Key Features:

• Linear-rate main spring for predictable, consistent performance
• High spring travel and deflection capability at compact mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Superior dynamic durability for extended component life
• Manufactured to precise tolerances for consistent performance
• Advanced corrosion protection through phosphating and epoxy coating
• Block resistance to prevent coil binding
• Part number imprinted on spring indicating rate and dimensions
• Compatible with Eibach connecting plates and tender springs

This main spring can be paired with helper springs to prevent spring looseness at full droop, or combined with tender springs to create custom progressive rate characteristics. Ideal for circuit racing, time attack, autocross, and professional motorsport applications where precise suspension tuning is critical.