Eibach 1200.250.0150 ERS Race Main Coilover Spring 12" x 2.5" x 150 lbs/in

The Eibach 1200.250.0150 is a high-performance race main spring designed for the renowned ERS (Eibach Race Spring) coilover system. This precision-engineered linear-rate spring measures 12 inches in length with a 2.5-inch diameter and delivers a 150 lb/in spring rate, providing the foundation for advanced suspension tuning in racing and high-performance applications.

ERS Double-Spring System Technology:

This main spring is part of Eibach's world-famous ERS double-spring system, which combines main and tender springs to create a sophisticated suspension setup. The system provides a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully closes. With over 700 different spring components available, the ERS system offers virtually unlimited tuning combinations for suspension engineers and enthusiasts.

Key Features:

• Linear-rate characteristic that determines the final rate of the suspension system
• Precision-wound construction with exact tolerances for consistent performance
• Shot-peened surface treatment for enhanced fatigue resistance
• High dynamic durability ensuring extended component longevity under racing conditions
• Superior corrosion protection through phosphating and epoxy coating
• High spring travel and deflection capability at compact mounting lengths
• Block resistance design prevents coil binding
• Clearly imprinted with part number indicating spring rate and physical dimensions
• Compatible with Eibach connecting plates for main/tender spring combinations

Designed for use with helper or tender springs to optimize suspension characteristics, this main spring provides the muscle needed to transform engine power into track adhesion while maintaining the precise balance between compliance and control during cornering, acceleration, and braking.