Spring Conv Rear 12in x 5in 200lb

The Spring Conv Rear 12in x 5in 200lb by SWIFT SPRINGS is a rear coilover spring engineered for independent rear suspension systems on road-course and street-driven vehicles. This spring conversion unit replaces factory springs when upgrading to a professional coilover damper setup, delivering the ride height, spring rate, and handling geometry control that serious enthusiasts demand. If you're transitioning from stock suspension to adjustable coilovers or fine-tuning your current platform, this 200-pound spring rate provides a balanced foundation for both daily driving comfort and spirited track days.

At 200 pounds per inch, this coilover spring strikes a middle ground—stiff enough to reduce body roll and improve turn-in response without excessive harshness on imperfect pavement. The 12-inch free length and 5-inch compressed working range allow for meaningful ride height adjustment while maintaining adequate suspension travel and preventing bottoming during aggressive cornering or load transfer events. SWIFT SPRINGS' manufacturing precision ensures consistent spring rates across batches, critical for front-to-rear balance tuning and predictable suspension behavior under varying track conditions. The spring's compact 5.6-pound weight keeps unsprung mass low, improving wheel compliance and reducing gyroscopic effects during direction changes.

This rear spring suits owners upgrading vehicles with independent rear suspension—including modern sports cars, performance sedans, and tuned coupes—to adjustable coilover systems. Installation pairs with compatible monotube or twin-tube dampers featuring 12-inch travel capacity and 5-inch spring perch spacing. Before purchasing, verify your coilover platform's spring seating specifications and confirm that 200 lbs/in matches your desired front spring rate and vehicle weight distribution; mismatched spring rates front-to-rear degrade handling balance and increase tire wear. Consult suspension geometry software or your coilover manufacturer's documentation to ensure this conversion spring aligns with your suspension tuning goals.