What does the spring rate (550 lb/in) mean for my vehicle's ride?

A spring rate of 550 pounds per inch means that it takes 550 pounds of force to compress the spring by one inch. A higher spring rate generally results in a firmer ride and less body roll during cornering compared to a stock spring.

What is the inner diameter of this coilover spring?

This Fox coilover spring has an inner diameter of 2.5 inches. This measurement is important for ensuring it fits correctly onto the spring perch of compatible shock absorber bodies.

Does this spring come with any hardware or shock bodies?

This product is for the coilover spring only. It does not include shock bodies or any mounting hardware. You will need to have compatible shock absorbers already installed or purchased separately.

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Specifications

Brand: FOX
Part #: 039-40-550-A

Fox Coilover Spring 16.000 TLG X 2.50 ID X 550 lbs/in. Silver

Name: Fox Coilover Spring 16.000 TLG X 2.50 ID X 550 lbs/in. Silver
Brand: FOX
SKU: fox-fox-coilover-spring-16-000-tlg-x-2-50-id-x-550-lbs-in-silver-t14-178948
Price: 160.00 USD
Availability: BackOrder

$160.00

On Backorder

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

Fox Coilover Spring 16" x 2.5" ID x 550 lb/in. Silver.

Key Features

Fits compatible Fox shock bodies.
Spring measures 16 inches in length.
Features a 2.5-inch inner diameter.
Has a spring rate of 550 pounds per inch.
Comes in a silver finish.

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About this part

Product Details

This Fox coilover spring measures 16 inches long with a 2.5-inch inner diameter and a spring rate of 550 pounds per inch. It's finished in silver and designed to work with compatible Fox shock bodies.

The spring rate is a critical factor in how your vehicle handles. A 550 lb/in rate offers a firmer ride than stock, which can improve body control during cornering and reduce squat under acceleration. This makes it a solid option for those looking to fine-tune their suspension for better performance, whether on the street or off-road, assuming it matches the valving and travel of your existing shock setup.

When installing, ensure the spring is properly seated on the lower spring perch and the upper mount. It's always a good idea to consult the shock manufacturer's documentation for specific installation guidelines to ensure proper function and safety.