Conventional Spring 13in x 5in 100LB

The Conventional Spring 13in x 5in 100LB from SWIFT SPRINGS is a precision coil spring engineered for builders and mechanics who demand reliability in suspension tuning and custom vehicle modifications. Whether you're lowering a sports car, fine-tuning ride height on a performance build, or engineering a custom suspension geometry, this conventional spring delivers the consistent spring rate needed for predictable handling and ride quality. Built to exacting standards, it's ideal for fabricators, restoration shops, and enthusiasts seeking OEM-quality components for aftermarket suspension systems.

This spring features a 100 lb/in spring rate with a 5-inch outer diameter and 13-inch overall length, making it suitable for applications requiring moderate spring stiffness without excessive harshness. The steel construction is finished in a copper powder coat, providing corrosion resistance and durability in harsh automotive environments. The conventional (non-progressive) design ensures linear load response—meaning spring force increases proportionally with compression—allowing for predictable suspension behavior, easier tuning, and repeatable setup across multiple vehicles. At 4.3 pounds, the spring's light weight contributes to reduced unsprung mass, which improves tire contact and chassis responsiveness.

Mechanics and fabricators benefit most from SWIFT SPRINGS' engineering when constructing custom suspension arms, adjustable coilover systems, or OEM replacement builds where factory springs no longer meet application needs. The 100 lb/in rate works well in mid-range suspension applications—stiffer than comfort-focused street setups but manageable without requiring extreme damper tuning. Verify mounting bore diameter, installed height requirements, and weight rating compatibility with your specific vehicle platform before ordering. Each spring ships individually and integrates seamlessly into spring seat designs using standard 5-inch bore configurations.