Eibach 1000.250.0400 ERS Race Main Coilover Spring 10 inch x 2.5 inch

The Eibach 1000.250.0400 is a precision-engineered race main spring designed for the ERS (Eibach Race Spring) modular coilover system. This linear-rate main spring provides the foundation for optimum suspension tuning, delivering consistent performance under demanding racing conditions.

ERS Double-Spring System:

The ERS system utilizes a Main and Tender spring concept that allows suspension tuners to create nearly unlimited combinations from over 700 different components. The main spring determines the final rate of the system and maintains a linear-rate characteristic throughout its compression cycle. When paired with a tender spring, the system provides a softer initial rate as both springs compress together, then transitions to the firmer main spring rate once the tender spring fully closes.

Key Features:

• Linear-rate main spring for predictable, consistent performance
• High spring travel and deflection capacity at compact mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Superior corrosion protection through phosphating and epoxy coating
• Precision manufacturing with tight tolerances for reliable performance
• Part number imprinted directly on spring for easy identification of rate and dimensions
• Compatible with Eibach connecting plates for tender spring integration
• Individual protective packaging to prevent damage during storage and shipping

This main spring can be used alone or combined with Eibach tender springs and helper springs to fine-tune suspension characteristics for specific track conditions, vehicle weight distribution, and driving style. The modular ERS system enables quick spring changes between racing sessions without replacing entire coilover assemblies.