Eibach 1000.250.0150 ERS Race Main Coilover Spring 2.5" ID x 15" Length

The Eibach ERS (Eibach Race Spring) Main Spring is engineered to deliver the precise suspension tuning required to transfer engine power to the track through optimum tire adhesion. This race-proven coilover spring provides the critical balance between compliance for road irregularities and firmness to control body roll, squat, and dive during aggressive cornering, acceleration, and braking.

ERS Double Spring System Compatibility:

This Main spring is designed for use in Eibach's renowned ERS double-spring system, which combines Main and Tender springs to create customizable suspension characteristics. The linear-rate Main spring determines the final rate of the system, while Tender springs (sold separately) establish the initial rate for a progressive suspension response. With over 700 individual spring components available, the ERS system offers virtually unlimited tuning combinations for suspension engineers and enthusiasts.

Key Features:

• Linear-rate spring characteristic for predictable suspension behavior
• High spring travel and deflection capacity at compact mounting lengths
• Shot-peened surface treatment for enhanced fatigue resistance
• Superior dynamic durability and component longevity
• Precision manufacturing with tight tolerances
• Advanced corrosion protection through phosphating and epoxy coating
• Block resistance design prevents coil binding
• Part number imprinted directly on spring indicating rate and dimensions
• Individual protective packaging for safe storage and handling

This Main spring works with Eibach Connecting Plates (sold separately) to attach Tender springs, and can be paired with Helper springs to prevent spring looseness at full droop extension. Designed for motorsport applications and high-performance street use where precise suspension control is essential.