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Suspension and Components› Springs and Components

Swift Springs

4" Coil Spring Pair

Name: 4" Coil Spring Pair
Brand: Swift Springs
SKU: Z65-102-380

$282.00 $273.54 Save $8.46

SKU: Z65-102-380

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Overview

Produced from Swift's proprietary HS5.TW material, these springs offer superior performance compared to standard silicone chrome steel. This specific spring features a 4-inch length, a 65mm inner diameter, and a spring rate of 38.0kgf/mm (2,128 lbs/inch). They are sold in pairs.

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Crafted from Swift's proprietary HS5.TW steel material, these springs are designed to be more durable and offer superior performance characteristics than traditional silicone chrome steel. This specific model, the Z65-102-380, is part of a wide variety of lengths and rates available to suit diverse driving needs, from daily driving to track use. With a 4-inch length and a 65mm (2.56-inch) inner diameter, this spring boasts a robust spring rate of 38.0kgf/mm, which translates to 2,128 lbs/inch. It offers a usable stroke of 40mm (1.6 inches) and a maximum stroke of 47mm (1.9 inches), providing a balance of ride comfort and aggressive handling. The springs are color-coordinated based on their inner diameter, aiding in identification and assembly. Users can expect noticeable improvements in traction, seamless weight transfer, enhanced ride quality, and a more predictable feel after installation. Swift Springs are known for delivering results, and these metric coilover springs are a testament to that commitment, turning theoretical potential into tangible performance gains. These springs are sold exclusively in pairs to ensure proper suspension tuning.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	Swift Springs
Part Number	Z65-102-380
Category	Suspension and Components

Videos

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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