What does the spring rate (400 lb/in) mean for my vehicle's ride?

A spring rate of 400 pounds per inch means that it takes 400 pounds of force to compress the spring by one inch. A higher spring rate generally results in a firmer ride and improved body control during aggressive driving or cornering compared to a stock spring.

What is the inner diameter of this spring?

This coilover spring has an inner diameter of 2.5 inches. This is a common size for many aftermarket performance coilovers, but it's important to verify it matches your existing or intended coilover body.

Does this spring come with any hardware?

This product is for the coilover spring only. Any necessary hardware, such as spring perches or collars, would typically be part of the complete coilover assembly and are not included with the spring itself.

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Specifications

Brand: FOX
Part #: 039-25-400-A

Fox Coilover Spring 14.000 TLG X 2.500 ID X 400 lbs/in. Silver

Name: Fox Coilover Spring 14.000 TLG X 2.500 ID X 400 lbs/in. Silver
Brand: FOX
SKU: fox-fox-coilover-spring-14-000-tlg-x-2-500-id-x-400-lbs-in-silver-t14-178906
Price: 101.00 USD
Availability: BackOrder

$101.00

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fox 14in coilover spring, 2.5in ID, 400 lb/in rate, silver.

Key Features

Fits 2.5 inch inner diameter coilover bodies.
Spring rate is 400 pounds per inch.
Spring length is 14 inches.
Features a silver finish.

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About this part

Product Details

Fox is well-known for its high-performance suspension components, and this coilover spring is a direct reflection of that expertise. This 14-inch long spring has a 2.5-inch inner diameter and a spring rate of 400 pounds per inch, making it suitable for a variety of custom suspension setups where precise control and a specific ride height are desired. The silver finish offers a clean look that complements many performance builds.

When you're building a custom suspension or replacing worn-out springs, choosing the right rate is crucial for achieving the handling characteristics you want. A 400 lb/in rate offers a firmer ride than stock, which can improve body control during cornering and reduce brake dive. This spring is designed to work with 2.5-inch inner diameter coilover bodies, a common size in the performance aftermarket.