Spring Rear 13in x 5in x 125# Platinum

The Eibach Spring Rear 13in x 5in x 125# Platinum is a precision coil spring engineered for rear suspension tuning on performance and modified vehicles. This Platinum Series spring delivers a 125 lb/in spring rate in a conventional coil design with a 13-inch length and 5-inch outer diameter, offering the stiffness needed for handling improvements without sacrificing ride quality on street or light track applications.

Constructed from high-grade steel and protected with Eibach's durable platinum powder coat finish, this rear spring resists corrosion and maintains structural integrity through repeated load cycles. The 125 lb/in rate strikes a balance between responsive handling and comfort—stiff enough to reduce body roll during cornering while soft enough to maintain contact with irregular road surfaces. At 5.7 x 5.45 x 14.35 inches and 4.55 lbs, the spring integrates seamlessly into existing suspension architectures where Eibach OEM fitment specifications are met.

This rear spring suits enthusiasts upgrading factory suspension geometry, drivers seeking improved stance and control without lowering kit complexity, and shops assembling custom or restoration builds. The Platinum Series finish ensures longevity in demanding conditions—salt-air exposure, high-heat brake environments, and repeated suspension articulation all benefit from corrosion-resistant coating. Eibach's engineering standards and domestic quality control make this spring a dependable choice for vehicles requiring precision rear-end tuning.

Spring rate selection is critical to suspension setup. A 125 lb/in rear spring is typically paired with front springs of similar or complementary rates to maintain proper geometry, prevent alignment issues, and distribute loads evenly. Verify fitment against your vehicle's OEM specifications and consult suspension geometry data before installation to ensure safe, predictable handling characteristics.