Hyperco Conventional Coil Spring 5in ID 9.9in Tall 400 lb/in — Front Suspension Performance

SKU: BJRF_18Y0400-9.9
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Hyperco

Hyperco engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hyperco lineup with fast shipping and expert fitment support — order with confidence.

Hyperco 5in ID 9.9in Conventional Coil Spring

The Hyperco 18Y0400-9.9 coil spring is the ideal choice for racers needing a stiffer 400 lb/in front-end setup. With a 9.9-inch free length and 5-inch internal diameter, this spring is engineered to handle the high loads experienced during aggressive cornering. The silver powder coat finish not only looks great but provides a protective barrier against the elements, ensuring your suspension components remain in top condition throughout the season.

Performance Benefits

  • Increased Stiffness: 400 lb/in rate reduces front-end dive during heavy braking.
  • Linear Rate: Provides predictable handling characteristics.
  • Durable Steel: High-tensile material prevents premature spring sag.
  • Standardized Fit: 5-inch ID fits most popular racing coil-over kits.

When every millisecond counts, your suspension setup must be flawless. The Hyperco 400 lb/in spring is designed to provide the support necessary to keep your front tires planted, maximizing grip and improving turn-in response. Its compact 9.9-inch height allows for more flexibility in your ride height adjustments, giving you the ability to dial in your chassis for specific track conditions. Hyperco is a name synonymous with racing excellence, and this spring is no exception. By choosing this high-performance part, you are ensuring that your vehicle benefits from the best in suspension technology. Experience the difference that a quality spring makes in your lap times. Find all your racing suspension needs at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Hyperco

Hyperco engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hyperco lineup with fast shipping and expert fitment support — order with confidence.

Hyperco 5in ID 9.9in Conventional Coil Spring

The Hyperco 18Y0400-9.9 coil spring is the ideal choice for racers needing a stiffer 400 lb/in front-end setup. With a 9.9-inch free length and 5-inch internal diameter, this spring is engineered to handle the high loads experienced during aggressive cornering. The silver powder coat finish not only looks great but provides a protective barrier against the elements, ensuring your suspension components remain in top condition throughout the season.

Performance Benefits

  • Increased Stiffness: 400 lb/in rate reduces front-end dive during heavy braking.
  • Linear Rate: Provides predictable handling characteristics.
  • Durable Steel: High-tensile material prevents premature spring sag.
  • Standardized Fit: 5-inch ID fits most popular racing coil-over kits.

When every millisecond counts, your suspension setup must be flawless. The Hyperco 400 lb/in spring is designed to provide the support necessary to keep your front tires planted, maximizing grip and improving turn-in response. Its compact 9.9-inch height allows for more flexibility in your ride height adjustments, giving you the ability to dial in your chassis for specific track conditions. Hyperco is a name synonymous with racing excellence, and this spring is no exception. By choosing this high-performance part, you are ensuring that your vehicle benefits from the best in suspension technology. Experience the difference that a quality spring makes in your lap times. Find all your racing suspension needs at GGCRACING.

Product Details

Product Description

About Hyperco

Hyperco engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hyperco lineup with fast shipping and expert fitment support — order with confidence.

Hyperco 5in ID 9.9in Conventional Coil Spring

The Hyperco 18Y0400-9.9 coil spring is the ideal choice for racers needing a stiffer 400 lb/in front-end setup. With a 9.9-inch free length and 5-inch internal diameter, this spring is engineered to handle the high loads experienced during aggressive cornering. The silver powder coat finish not only looks great but provides a protective barrier against the elements, ensuring your suspension components remain in top condition throughout the season.

Performance Benefits

  • Increased Stiffness: 400 lb/in rate reduces front-end dive during heavy braking.
  • Linear Rate: Provides predictable handling characteristics.
  • Durable Steel: High-tensile material prevents premature spring sag.
  • Standardized Fit: 5-inch ID fits most popular racing coil-over kits.

When every millisecond counts, your suspension setup must be flawless. The Hyperco 400 lb/in spring is designed to provide the support necessary to keep your front tires planted, maximizing grip and improving turn-in response. Its compact 9.9-inch height allows for more flexibility in your ride height adjustments, giving you the ability to dial in your chassis for specific track conditions. Hyperco is a name synonymous with racing excellence, and this spring is no exception. By choosing this high-performance part, you are ensuring that your vehicle benefits from the best in suspension technology. Experience the difference that a quality spring makes in your lap times. Find all your racing suspension needs at GGCRACING.

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