Eibach 0900.225.0250 ERS Race Main Coilover Spring 2.25" ID x 9" Length

The Eibach ERS (Eibach Race Spring) Race Main Spring is a precision-engineered linear-rate coilover spring designed for motorsport and high-performance suspension applications. This spring serves as the primary load-bearing component in Eibach's renowned ERS double-spring system, providing the foundation for fine-tuned suspension performance on track and street vehicles.

ERS Double-Spring System Technology:

The ERS system utilizes a Main and Tender spring concept that delivers optimal suspension characteristics. The Main spring provides a linear-rate characteristic and determines the final rate of the system. When combined with a Tender spring, the system offers a softer initial rate as both springs compress together, then transitions to the firmer Main spring rate once the Tender spring fully compresses. This dual-rate behavior allows suspension engineers to precisely balance compliance over road irregularities with the firmness needed to control body roll, squat, and dive during aggressive driving.

Key Features:

• Linear-rate main spring for predictable, consistent suspension behavior
• Compatible with over 700 ERS components for virtually unlimited suspension tuning combinations
• High spring travel and deflection capability with short mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Superior dynamic durability and component longevity
• Manufactured to precise tolerances for consistent performance
• Advanced corrosion protection through phosphating and epoxy coating
• Clearly imprinted with part number indicating spring rate and physical dimensions
• Individually packaged for protection during storage and shipping

Application Notes:

This Race Main Spring is designed to work with Eibach Tender springs (for dual-rate tuning), Helper springs (to prevent spring looseness at full droop), and Connecting Plates (to join Main and Tender springs). The system allows suspension tuners to create custom spring combinations from readily available stock components, making it ideal for racing applications where suspension setup changes are frequent.

Eibach's ERS springs are trusted by professional race teams and performance enthusiasts worldwide for their exceptional quality, durability, and tuning flexibility.