5-Inch x 13-Inch Rear Coil Spring, 165 lb/in

The Hyperco 18S-165 is a conventional rear coil spring engineered for precision in motorsports and performance applications. This spring boasts a 5-inch outside diameter and a 13-inch free length, providing a consistent and reliable foundation for suspension setups. With a spring rate of 165 lbs/in and a solid height of 3.146 inches, the 18S-165 is designed to deliver specific performance characteristics. Its construction ensures it maintains its free length and installed height, contributing to predictable handling and suspension response. The spring is typically finished in a silver or blue powder coat for durability and a clean aesthetic. This conventional coil spring is intended for rear suspension applications, and its specifications suggest it is a direct replacement or upgrade component for vehicles where these dimensions and rates are required. While specific vehicle fitment is not detailed in the provided evidence, its specifications align with common aftermarket performance spring dimensions.