The AST 2000 Series Coilovers for BMW 3 Series E30 are a high-performance shock absorber system designed to provide superior handling and improved ride comfort. The system features adjustable height, adjustable rebound damping, and adjustable spring rates, allowing you to fine-tune your suspension setup for the desired handling characteristics. The rear spring rate is 835kg, providing a stiffer ride and better control over the rear end. The AST 2000 Series Coilovers are the perfect choice for those looking to get the most out of their BMW 3 Series E30.