Hyperco I-Series Coilover Springs

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Hyperco offers I-Series coilover springs—high performance aftermarket suspension springs primarily used in motorsports and motor racing. Great for applications like

Hyperco offers I-Series coilover springs—high performance aftermarket suspension springs primarily used in motorsports and motor racing. Great for applications like Indy Car, Indy Lights, sports car racing, prototype race cars, Tudor classes, and SSCA racing, these coilovers have been proven to perform consistently, season after season. Why waste your racing budget on a spring that won't hold its rate through half a season? Make the switch to Hyperco I-Series coilover springs—properly designed and manufactured springs that won't lose free length under normal racing applications. Select the spring rate and height that best suits your vehicle. Features and specs of Hyperco I-Series coilover springs: * High-tensile strength chrome silicone construction * Finished with a tough blue epoxy powdercoat that offers unmatched durability * Available in front and rear applications * Optimum Body Diameter (OBD) spring design * Available in a wide range of free lengths and rates * Fits coilover shocks designed to use 36mm ID springs (OD varies by rate and length) * Advanced metallurgy, spring winding, and heat-treating techniques result in springs that won't lose ride height or rate

Showing In Stock Items. Show All 51 Items.

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Hyperco I-Series Coilover Springs 18I-0500-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 500 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-0500-HT

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Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-2800-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 2,800 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0005

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-1700-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 1,700 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0018

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Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-1000-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 1,000 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-1000-HT

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Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-2400-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 2,400 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0009

Not Yet Reviewed

Estimated Ship Date: Monday 11/17/2025

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Estimated Ship Date: Monday 11/17/2025

Hyperco I-Series 5 Inch Coilover Spring 18I-3100-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 3,100 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0002

Not Yet Reviewed

Estimated Ship Date: Dec 3, 2025 if ordered today

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Estimated Ship Date: Dec 3, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-1500-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 1,500 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0022

Not Yet Reviewed

Estimated Ship Date: Dec 3, 2025 if ordered today

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Estimated Ship Date: Dec 3, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-0800-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 800 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0030

Not Yet Reviewed

Estimated Ship Date: Dec 3, 2025 if ordered today

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Estimated Ship Date: Dec 3, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-1200-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 1,200 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0026

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-1100-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 1,100 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0027

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-1000-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 1,000 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0028

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-0700-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 700 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0031

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-0550-HT

Coilover Spring, Blue, in FL x 36in ID x 550lb/in

Part Number: HYC-18I-0550-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-0650-HT

Coilover Spring, Blue, ~5in FL x 36in ID x 650lb/in

Part Number: HYC-18I-0650-HT

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Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-0750-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 750 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-0750-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-0900-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 900 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-0900-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-0950-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 950 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-0950-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-1100-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 1,100 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-1100-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-1700-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 1,700 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-1700-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-1800-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 1,800 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-1800-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series Coilover Springs 18I-3700-HT

Coilover Spring, I-Series, 36mm Inner Diameter, 3,700 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-18I-3700-HT

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-2600-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 2,600 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0007

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-2500-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 2,500 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0008

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 5 Inch Coilover Spring 18I-2000-HT-5

Coilover Spring, I-Series, 36mm Inner Diameter, 5 in. Free Length, 2,000 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0013

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

Hyperco I-Series 4 Inch Coilover Spring 18I-2000-HT-4

Coilover Spring, I-Series, 36mm Inner Diameter, 4 in. Free Length, 2,000 lbs./in. Spring Rate, Blue Powdercoated, Each

Part Number: HYC-S0014

Not Yet Reviewed

Estimated Ship Date: Dec 4, 2025 if ordered today

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Estimated Ship Date: Dec 4, 2025 if ordered today

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