Conv Rear Spring 5in x 13in x 275#

The Conv Rear Spring 5in x 13in x 275# from AFCO Racing Products is purpose-built for racers and performance enthusiasts who demand precision handling and predictable weight transfer during acceleration and cornering. This conventional rear spring sits at the heart of any serious suspension tuning strategy, where spring rate directly influences chassis balance, tire loading, and lap consistency. Whether you're dialing in a drag car, road race platform, or street performance vehicle, the 275-pound rate offers a balanced compromise between responsiveness and component longevity.

This coil spring features a 5-inch bore diameter and 13-inch overall length, engineered to fit standard rear suspension geometries common in American muscle cars, classic hot rods, and circle-track competition vehicles. The 275-pound spring rate means it requires 275 pounds of force to compress the spring one inch—a moderate stiffness that works well with adjustable shocks to manage load transfer without sacrificing ride quality or limiting suspension travel. AFCO's manufacturing process ensures consistent wire diameter and coil pitch, eliminating the dead-band feel that comes from inferior springs and delivering repeatable performance lap after lap.

This spring excels in rear-wheel-drive platforms where precise spring selection directly impacts weight bias and traction control. Install it alongside quality adjustable shocks and properly valved dampers to unlock the full tuning potential—the spring rate alone won't transform handling without coordinated shock absorber selection. Confirm rear axle housing bore diameter and suspension mounting points before purchase; while the 5-inch x 13-inch dimensions suit common coilover and traditional suspension setups, always verify fitment with your specific vehicle platform and consult suspension geometry references if you're swapping from a different spring rate.