Conv Rear Spring 5in x 11in x 300#

The AFCO Racing Products Conventional Rear Spring 5 inch x 11 inch x 300# (model 25300B) is a precision coil spring engineered for high-performance suspension tuning in racing and performance vehicles. This conventional-style rear spring delivers a 300 pound-per-inch rate and is constructed from steel with a black powder coat finish for durability and corrosion resistance in demanding conditions.

With a 5-inch outer diameter and 11-inch length, this spring integrates into established suspension systems designed for this geometry. The 300 lb/in spring rate positions it in the moderate-to-firm range, suitable for vehicles requiring controlled ride height and load support without excessive stiffness that would compromise comfort on street-driven chassis. The black powder coat provides UV and moisture protection, important for vehicles exposed to seasonal weather changes or stored long-term between racing seasons.

This spring is ideal for restoration builders, performance enthusiasts, and racing teams tuning classic or modern vehicles with conventional rear suspensions. Whether you're fine-tuning ride dynamics for autocross competition, street performance builds, or rebuilding a suspension system after major work, the 25300B offers the repeatability and quality control that AFCO Racing Products is known for in the motorsports community. Individual spring replacement allows targeted adjustments without replacing the entire suspension package.

AFCO Racing Products specializes in suspension components for performance vehicles, and their coil springs are trusted by racers for consistency and longevity. The 300# rate falls within the common range for rear suspension tuning, making it a versatile choice for builders seeking reliable, manufacturer-engineered spring solutions.