Firestone 4185 Coil-Rite Air Helper Spring Kit

Firestone 4185 Coil-Rite Air Helper Spring Kit is designed to help preserve ride height and improve stability on coil-sprung suspensions under load. The Coil-Rite system uses internal coil spring components to provide supplemental support, reducing bottom-out and sway when carrying payloads or towing. The kit pairs with durable hardware and OEM-style components to deliver a straightforward retrofit with a clean installation. By enabling precise air-assisted tuning, drivers can adjust stiffness to match load conditions, resulting in better handling, improved balance, and enhanced overall ride quality. Constructed from corrosion-resistant materials, this kit is built for longevity in varied road conditions. Depending on the vehicle, the system may integrate with pump accessories or portable inflators for convenient inflation.