Eibach 0800.250.0850 ERS Race Main Spring 8" x 2.5" x 850 lb/in

The Eibach ERS (Eibach Race Spring) 0800.250.0850 is a high-performance race main spring engineered for motorsports applications where precise suspension tuning is critical. This linear-rate coil spring measures 8 inches in free length with a 2.5-inch inner diameter and delivers a spring rate of 850 lb/in, providing the foundation for Eibach's renowned double-spring suspension systems.

ERS Double-Spring System:

Eibach's ERS system utilizes a main and tender spring concept that allows suspension engineers to fine-tune compression characteristics. The main spring determines the final rate of the system with its linear-rate design, while tender springs (sold separately) control the initial rate. This configuration provides a softer initial response when both springs compress together, then transitions to the firmer main spring rate once the tender spring fully compresses—delivering optimal balance between compliance over road irregularities and control during cornering, acceleration, and braking.

Key Features:

• Linear-rate main spring design for predictable, consistent performance
• Part of Eibach's 700+ component ERS system allowing nearly unlimited suspension combinations
• Shot-peened surface treatment for enhanced fatigue resistance and longevity
• High spring travel and deflection capability at compact mounting lengths
• Superior corrosion protection through phosphating and epoxy coating
• Manufactured to precise tolerances for reliable performance
• Part number imprinted directly on spring for easy identification of rate and dimensions
• Block resistance design prevents coil binding
• Compatible with Eibach connecting plates for tender spring integration

This main spring is designed for professional racing teams and serious enthusiasts who demand the highest level of suspension control and adjustability. Use with Eibach helper springs to prevent spring looseness at full droop, or combine with tender springs to create custom progressive-rate systems tailored to specific track conditions and vehicle requirements.