Hyperco 18Y0550-9.9 Front Coil Spring 5.5in Rate 9.9in Length 5in ID

The Hyperco 18Y0550-9.9 is a high-performance front coil spring engineered for racing and performance applications. Manufactured from chrome silicon steel and precision wound, this spring delivers consistent performance and exceptional durability under demanding conditions.

Key Specifications:

• Spring rate: 550 lbs/in
• Free length: 9.9 inches
• Inside diameter: 5.0 inches
• Wire diameter: Optimized for 550 lb/in rate
• Chrome silicon construction for superior strength and fatigue resistance
• Ground and squared ends for proper seating

Hyperco springs are widely used in circle track, road racing, drag racing, and high-performance street applications. Each spring is manufactured to tight tolerances and shot-peened to enhance fatigue life. The chrome silicon material provides excellent resistance to set and maintains consistent spring rates throughout its service life.

This front spring is ideal for custom suspension setups where precise spring rate control is required. The 5-inch inside diameter is compatible with many common coilover systems and suspension platforms.