Spring Rear 20in x 5in x 85

The Spring Rear 20in x 5in x 85 from EIBACH is a precision coil spring engineered for rear suspension systems where load capacity, ride quality, and durability are non-negotiable. Built for enthusiasts and professional mechanics who demand OEM-equivalent or performance-level spring rates, this rear spring addresses the critical role suspension geometry plays in vehicle handling, braking stability, and load distribution. Whether you're restoring factory specs or upgrading a daily driver, a quality rear spring is the foundation of predictable suspension behavior and tire contact patch consistency.

This EIBACH rear spring measures 20 inches in free length with a 5-inch outside diameter and an 85-pound-per-inch spring rate, making it ideal for mid-size to larger passenger vehicles and light-duty applications where controlled compression and rebound are essential. EIBACH's manufacturing process yields consistent wire diameter, coil pitch, and hardness across every unit, minimizing variance in spring rates and ensuring matched-pair performance when both rear springs are replaced. The 85 lb/in rate balances responsive cornering with ride compliance, resisting excessive squat under acceleration while maintaining comfort on uneven surfaces—a hallmark of German engineering that prioritizes longevity over aggressive tuning.

Mechanics and vehicle owners benefit most from this rear spring when addressing worn or sagging suspension on vehicles that have accumulated significant mileage or load cycles. Installation pairs well with complete rear suspension overhauls, including dampers, bushings, and trailing arm hardware—never replace a single spring without inspecting opposite-side components for similar wear. Always verify compatibility with your vehicle's year, make, and model before purchase; spring rates are tuned to specific chassis weights and geometry. Proper installation using a spring compressor and torque specification is mandatory for safety and performance.