Eibach 1000.250.0350 ERS Race Main Coilover Spring 2.5" ID x 3.5" Travel

The Eibach 1000.250.0350 is a precision-engineered race main spring designed for the Eibach ERS (Eibach Race Spring) coilover system. This high-performance linear-rate spring serves as the foundation for creating custom suspension setups that deliver optimal traction and handling on the track.

ERS Double-Spring System Technology:

Eibach's ERS system utilizes a main and tender spring concept that allows suspension tuners to dial in the perfect balance between compliance and control. The main spring provides the final spring rate once the tender spring fully compresses, creating a progressive response that maintains tire contact while controlling body roll, squat, and dive during aggressive driving.

Key Features:

• Linear-rate characteristic determines final system spring rate
• Compatible with over 700 ERS components for unlimited tuning combinations
• High spring travel and deflection at compact mounting lengths
• Shot-peened surface treatment for superior fatigue resistance
• Phosphate and epoxy coating provides excellent corrosion protection
• Precision manufacturing with tight tolerances for consistent performance
• Imprinted with part number indicating spring rate and physical dimensions
• Block resistance design prevents spring damage at full compression
• Individual protective packaging ensures product arrives ready to install

This main spring works in conjunction with Eibach tender springs and helper springs (sold separately) to create a fully customizable coilover setup. Helper springs prevent the main spring from becoming loose at full droop, while tender springs determine the initial rate of the system. Connecting plates are available separately for joining main and tender springs.