The AST linear race spring is a single 150 mm coil spring with an 180 N/mm rate and a 61 mm inner diameter, made for coilover-style suspension to increase spring rate and adjust ride height. Supplied individually, it lets builders select a firmer spring to match heavier damping or track-focused setups; verify that the 61 mm ID will fit your coilover assembly before purchasing.
AST Linear Race Springs - 150mm Length x 180 N/mm Rate x 61mm ID - Single