Coil Over Spring 1.625in ID 4.25in Tall QM

The Coil Over Spring 1.625in ID 4.25in Tall QM by HYPERCO is a precision-engineered suspension component designed for performance vehicles and custom automotive builds that demand advanced damping control. This coil-over spring is engineered for drivers and mechanics who require independent spring rate tuning, adjustable ride height, and superior handling dynamics for street, track, or drag applications. The compact 4.25-inch height and 1.625-inch inner diameter make this spring ideal for modern suspension systems where space constraints and weight reduction are critical to vehicle performance.

HYPERCO coil-over springs are manufactured using high-strength chrome silicon wire that maintains consistent spring rate across the entire compression stroke, eliminating the unpredictable behavior of worn or mismatched OEM springs. The 1.625-inch bore diameter integrates seamlessly with standard 46mm coil-over damper bodies, while the 4.25-inch free length allows for proper suspension geometry and prevents binding during full compression or extension. At just 0.66 pounds per spring, this component contributes minimal unsprung weight while delivering the rigidity and durability needed for repeated high-performance cycles without fatigue or deformation.

Automotive enthusiasts building independent double-wishbone or MacPherson strut suspensions will find this spring essential for vehicles requiring precise spring rate customization—whether tuning for autocross, road racing, or aggressive street applications. The QM designation indicates this spring is compatible with quality metric-based damper assemblies, making it suitable for both domestic and import performance platforms. Installation with proper spring compressors and suspension alignment verification ensures optimal camber, caster, and ride height geometry; professional installation is recommended for vehicles intended for track use or extreme performance driving.