What is the purpose of a 650 lb/in spring rate?

A 650 lb/in spring rate is considered a firmer rate, often used to support heavier vehicles or for performance applications. It helps control body roll and keeps the suspension from bottoming out on rough terrain.

Do I need to buy these springs in pairs?

It is highly recommended to replace coilover springs in pairs. This ensures that both sides of your vehicle have the same spring rate, leading to balanced handling and consistent ride height.

What does the '2.50 ID' specification mean?

ID stands for Inner Diameter. This specification means the spring is designed to fit over a 2.5-inch diameter shock body or perch. Always confirm your existing coilover setup matches this dimension.

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Specifications

Brand: FOX
Part #: 039-40-650-A

Fox Coilover Spring 16.000 TLG X 2.50 ID X 650 lbs/in. Silver

Name: Fox Coilover Spring 16.000 TLG X 2.50 ID X 650 lbs/in. Silver
Brand: FOX
SKU: fox-fox-coilover-spring-16-000-tlg-x-2-50-id-x-650-lbs-in-silver-t14-178950
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" long, 2.5" ID, 650 lb/in. Silver.

Key Features

This is a 16-inch long coilover spring.
The inner diameter of the spring is 2.5 inches.
This spring has a rate of 650 pounds per inch.
The spring is finished in silver.
Manufactured by FOX.

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About this part

Product Details

This 16-inch long, 2.5-inch inner diameter coilover spring from FOX is rated at 650 pounds per inch. It’s a well-built replacement or upgrade component for your suspension system, designed to provide a specific spring rate for controlled damping and ride height.

Crafted from strong steel and finished in silver, this spring is built to handle the demands of off-road or performance driving. The 650 lb/in rate is a common choice for vehicles needing a firmer ride, helping to reduce body roll during cornering and keep the tires planted over rough terrain. It’s important to match the spring rate to your vehicle’s weight and intended use to achieve the best balance of comfort and performance.

When replacing coilover springs, it’s a good idea to replace them in pairs to ensure consistent handling and ride characteristics on both sides of the vehicle. Always refer to the manufacturer's installation guide for proper fitment and setup procedures.