SKU: SWI120-250-400V
MPN: 120-250-400 V
The Swift Springs Coilover Spring 12-inch x 2.5-inch 150/400 Progressive is a precision suspension component engineered for vehicles requiring progressive spring rate characteristics. This coilover spring delivers a 150 lb/in initial rate that transitions to 400 lb/in under load, providing responsive handling compliance during light maneuvering and firm support under heavy compression—ideal for tactical vehicles, off-road platforms, and high-performance suspension builds where load management and ride quality must both be maintained across varied operational conditions.
Manufactured from steel with a durable black powder-coat finish, this spring offers corrosion resistance and a professional appearance in demanding environments. The 12-inch length and 2.5-inch inner diameter accommodate standard coilover shock absorber configurations. The progressive spring rate design eliminates the compromises of conventional fixed-rate springs: initial softness reduces vibration transmission during normal cruising, while the increasing rate under bump compression prevents excessive suspension travel and protects against bottoming. This characteristic makes progressive coilover springs the preferred choice for vehicles carrying variable loads or operating on unpredictable terrain where predictable response is critical.
Purpose-built for platform builders, motorsport enthusiasts, and operators maintaining specialized vehicles, the Swift Springs coilover spring integrates into independent double-wishbone, MacPherson strut, and multi-link suspension architectures. Whether supporting off-road recovery rigs, tactical support vehicles, or track-oriented builds, this spring's progressive rate architecture delivers the dynamic range required for both comfort and control. Individual spring replacement or full coilover tuning projects benefit from Swift's engineering precision and material consistency.
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