Hyperco 18SN-325 Rear Coil Spring 5in ID 11in Tall 325 lb/in — Performance Suspension

SKU: BJRF_18SN-325
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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 18SN-325 Rear Coil Spring: Uncompromising Rigidity for Elite Performance

Experience the pinnacle of rear suspension performance with the Hyperco 18SN-325 Rear Coil Spring. Engineered for the most demanding high-performance and competitive racing environments, this conventional coil spring delivers an ultra-high spring rate, providing maximum rigidity and minimal suspension travel. Hyperco's industry-leading manufacturing processes ensure unparalleled consistency and durability, giving you the edge needed to dominate the competition.

Designed for Peak Performance and Longevity

The 18SN-325 coil spring is meticulously crafted from a state-of-the-art high-tensile steel alloy, chosen for its exceptional resistance to fatigue and its ability to maintain precise spring rates under the most extreme loads. The signature blue powder coat finish not only provides a striking visual accent but also offers superior protection against corrosion, impacts, and harsh track conditions, ensuring your suspension performs flawlessly race after race. With a 5-inch outer diameter and an 11-inch free length, this spring is the ultimate choice for custom rear suspension systems where absolute stiffness and precision are non-negotiable.

Key Features & Benefits:

  • Ultra-High Spring Rate: A 325 lb/in spring rate delivers extreme rear stiffness, crucial for professional racing and precision handling.
  • Premium Alloy Construction: Fabricated from advanced high-tensile steel for superior strength and extended fatigue life.
  • Robust Protection: Features a durable blue powder coat for maximum corrosion resistance and aesthetic appeal.
  • Optimized Design: Conventional 5-inch OD ensures compatibility with a wide array of high-performance and custom suspension setups.
  • Precision Engineered: Guarantees exact spring rate accuracy and repeatability, vital for consistent lap times.

Specifications:

  • Part Number: 18SN-325
  • Type: Conventional Coil Spring
  • Outer Diameter: 5 inches
  • Length: 11 inches
  • Spring Rate: 325 lb/in
  • Position: Rear
  • Material: Steel
  • Finish: Blue Powder Coat

For those who demand the absolute best in suspension rigidity and performance, the Hyperco 18SN-325 Rear Coil Spring is the definitive choice. Elevate your vehicle's capabilities with Hyperco's engineering excellence. Find this and other elite performance parts at GGCRACING.COM.

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 18SN-325 Rear Coil Spring: Uncompromising Rigidity for Elite Performance

Experience the pinnacle of rear suspension performance with the Hyperco 18SN-325 Rear Coil Spring. Engineered for the most demanding high-performance and competitive racing environments, this conventional coil spring delivers an ultra-high spring rate, providing maximum rigidity and minimal suspension travel. Hyperco's industry-leading manufacturing processes ensure unparalleled consistency and durability, giving you the edge needed to dominate the competition.

Designed for Peak Performance and Longevity

The 18SN-325 coil spring is meticulously crafted from a state-of-the-art high-tensile steel alloy, chosen for its exceptional resistance to fatigue and its ability to maintain precise spring rates under the most extreme loads. The signature blue powder coat finish not only provides a striking visual accent but also offers superior protection against corrosion, impacts, and harsh track conditions, ensuring your suspension performs flawlessly race after race. With a 5-inch outer diameter and an 11-inch free length, this spring is the ultimate choice for custom rear suspension systems where absolute stiffness and precision are non-negotiable.

Key Features & Benefits:

  • Ultra-High Spring Rate: A 325 lb/in spring rate delivers extreme rear stiffness, crucial for professional racing and precision handling.
  • Premium Alloy Construction: Fabricated from advanced high-tensile steel for superior strength and extended fatigue life.
  • Robust Protection: Features a durable blue powder coat for maximum corrosion resistance and aesthetic appeal.
  • Optimized Design: Conventional 5-inch OD ensures compatibility with a wide array of high-performance and custom suspension setups.
  • Precision Engineered: Guarantees exact spring rate accuracy and repeatability, vital for consistent lap times.

Specifications:

  • Part Number: 18SN-325
  • Type: Conventional Coil Spring
  • Outer Diameter: 5 inches
  • Length: 11 inches
  • Spring Rate: 325 lb/in
  • Position: Rear
  • Material: Steel
  • Finish: Blue Powder Coat

For those who demand the absolute best in suspension rigidity and performance, the Hyperco 18SN-325 Rear Coil Spring is the definitive choice. Elevate your vehicle's capabilities with Hyperco's engineering excellence. Find this and other elite performance parts at GGCRACING.COM.

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 18SN-325 Rear Coil Spring: Uncompromising Rigidity for Elite Performance

Experience the pinnacle of rear suspension performance with the Hyperco 18SN-325 Rear Coil Spring. Engineered for the most demanding high-performance and competitive racing environments, this conventional coil spring delivers an ultra-high spring rate, providing maximum rigidity and minimal suspension travel. Hyperco's industry-leading manufacturing processes ensure unparalleled consistency and durability, giving you the edge needed to dominate the competition.

Designed for Peak Performance and Longevity

The 18SN-325 coil spring is meticulously crafted from a state-of-the-art high-tensile steel alloy, chosen for its exceptional resistance to fatigue and its ability to maintain precise spring rates under the most extreme loads. The signature blue powder coat finish not only provides a striking visual accent but also offers superior protection against corrosion, impacts, and harsh track conditions, ensuring your suspension performs flawlessly race after race. With a 5-inch outer diameter and an 11-inch free length, this spring is the ultimate choice for custom rear suspension systems where absolute stiffness and precision are non-negotiable.

Key Features & Benefits:

  • Ultra-High Spring Rate: A 325 lb/in spring rate delivers extreme rear stiffness, crucial for professional racing and precision handling.
  • Premium Alloy Construction: Fabricated from advanced high-tensile steel for superior strength and extended fatigue life.
  • Robust Protection: Features a durable blue powder coat for maximum corrosion resistance and aesthetic appeal.
  • Optimized Design: Conventional 5-inch OD ensures compatibility with a wide array of high-performance and custom suspension setups.
  • Precision Engineered: Guarantees exact spring rate accuracy and repeatability, vital for consistent lap times.

Specifications:

  • Part Number: 18SN-325
  • Type: Conventional Coil Spring
  • Outer Diameter: 5 inches
  • Length: 11 inches
  • Spring Rate: 325 lb/in
  • Position: Rear
  • Material: Steel
  • Finish: Blue Powder Coat

For those who demand the absolute best in suspension rigidity and performance, the Hyperco 18SN-325 Rear Coil Spring is the definitive choice. Elevate your vehicle's capabilities with Hyperco's engineering excellence. Find this and other elite performance parts at GGCRACING.COM.

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