The King Shocks 3.0 ID coil spring has a 3.0-inch inner diameter, a 12-inch free length and a 450 lb spring rate. Intended for coilover-style assemblies that accept 3.0-inch ID springs, it provides a substantial rate for higher load support or firmer handling. Use this option to raise spring stiffness where a 12-inch, 450 lb specification is required by your suspension tuning goals.
King Shocks 3.0 ID Coil Springs 12 x 450lb