20in x 5in Rear Spring 150lb

The 20in x 5in Rear Spring 150lb from EIBACH is a precision-engineered coil spring engineered for enthusiasts and professionals seeking to refine suspension geometry and ride characteristics. Built for rear-axle applications, this spring delivers consistent load support and handles the demands of modified vehicles, whether you're fine-tuning factory suspension or constructing a custom setup from the ground up. Spring rate selection is critical to suspension performance—the 150 lb/in rate on this unit is ideal for light to moderate load-carrying scenarios where progressive damping control and predictable body roll are priorities.

This conventional coil spring features a 5-inch outside diameter and 20-inch length, making it compatible with most modern coilover and independent rear-suspension platforms. The steel construction with red powder-coat finish resists corrosion while maintaining structural integrity under cyclic loading—essential for longevity in high-heat or salt-exposure environments. The 150 lb/in spring rate defines how much force (in pounds) compresses the spring one inch; lighter rates provide comfort and compliance, while this moderate specification balances responsiveness with ride smoothness. At 10.27 lbs, the spring's mass is optimized to minimize unsprung weight, improving handling dynamics and reducing suspension stress during acceleration, braking, and cornering transitions.

Mechanics and chassis builders frequently pair rear springs of this specification with complementary front springs, dampers, and anti-roll bars to achieve balanced suspension tuning across the entire vehicle. Installation requires proper spring compressors and jack stands—never attempt coil spring replacement without appropriate safety equipment. This spring is best suited for rear-independent suspension designs; verify fitment against your vehicle's suspension architecture and existing spring rates before purchase to ensure harmonious spring pairing and safe handling characteristics.