4-Inch Length 65mm ID 28.0kgf/mm Coilover Spring

Produced using Swift's proprietary HS5.TW material, these springs are designed to offer superior performance and durability over traditional silicone chrome steel. This specific spring (part number Z65-102-280) is 4 inches in length and features a 65mm inner diameter, commonly referred to as a 2.56-inch ID. It is rated at 28.0 kgf/mm, which equates to 1,568 lbs/inch, providing a firm yet responsive feel. The spring offers a usable stroke of 45mm (1.8 inches) and a maximum stroke of 52mm (2.0 inches), contributing to its predictable performance characteristics. Users can expect a noticeable improvement in traction, more seamless weight transfer during cornering, and a better overall ride quality. These benefits translate to a more predictable feel behind the wheel, potentially leading to lower tire temperatures and a more enjoyable driving experience. The springs are color-coordinated based on their inner diameter, aiding in identification and application. Note that these springs are sold exclusively in pairs.