Eibach 0400.300.0500S Silver Coilover Spring ID Off-Road ERS - 3.00

The Eibach 0400.300.0500S is a high-performance silver coilover spring designed for off-road and racing applications. Featuring a 3.00" inner diameter, this spring is part of Eibach's renowned ERS (Eibach Race Spring) system, engineered to deliver optimal suspension performance through precise tuning and exceptional build quality.

ERS Double Spring System Technology:

Eibach's ERS system utilizes a Main and Tender spring concept that provides superior suspension characteristics. The system delivers a softer initial rate when both springs compress together, then transitions to a firmer ending rate once the tender spring fully closes. This dual-stage design balances compliance over road irregularities while maintaining control during cornering, acceleration, and braking.

Key Features:

• 3.00" inner diameter for precise fitment
• Silver finish with phosphating and epoxy coating for superior corrosion protection
• Shot-peened surface treatment for enhanced fatigue resistance
• High spring travel and deflection capacity at short mounting lengths
• Excellent block resistance for extreme compression scenarios
• Precise manufacturing tolerances ensure consistent performance
• Part number imprinted directly on spring for easy identification
• Compatible with Eibach connecting plates for main/tender spring combinations
• Individual protective packaging to prevent damage

Application Notes:

This spring is designed as part of Eibach's modular ERS system, which offers over 700 different spring components that can be combined to create nearly unlimited suspension configurations. Whether you're a professional suspension engineer or weekend enthusiast, the ERS system provides the flexibility to dial in your exact suspension requirements for racing or off-road use.

The ERS system supports Main springs (linear-rate characteristics for final system rate), Tender springs (linear or progressive rates for initial system rate), Helper springs (to prevent spring looseness at full droop), and Connecting Plates (for securing spring assemblies). This modular approach allows precise suspension tuning without custom spring manufacturing.