What is a linear spring rate?

A linear spring rate means that for every inch (or millimeter) the spring is compressed, its resistance increases by the same amount. This provides predictable and consistent handling characteristics, especially during aggressive driving.

What does the 61mm ID refer to?

The 61mm ID refers to the inner diameter of the spring. This measurement is important for ensuring the spring will fit correctly onto the shock body or spring perch of your coilover assembly.

Is this spring suitable for daily driving?

With a rate of 300 N/mm, this is a very stiff spring intended for performance and racing applications. While it can be used on a street car, it will significantly stiffen the ride and may not be comfortable for daily commuting.

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Specifications

Brand: AST
Part #: AST-100-300-61
UPC: astAST-100-300-61

AST Linear Race Springs - 100mm Length x 300 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 100mm Length x 300 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-100mm-length-x-300-n-mm-rate-x-61mm-id-single-t14-329707
Price: 103.36 USD
Availability: BackOrder

$103.36

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AST Linear Race Springs - 100mm Length x 300 N/mm Rate x 61mm ID - Single. For performance suspension builds.

Key Features

This is a single AST Linear Race Spring.
It measures 100mm in length.
The spring rate is 300 N/mm, providing a stiff and responsive suspension.
It has a 61mm inner diameter, suitable for many coilover applications.
Linear spring design offers consistent stiffness under compression for predictable handling.

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About this part

Product Details

If you're building a custom coilover setup or rebuilding your existing suspension for track use, the spring rate is one of the most critical components. This AST Linear Race Spring offers a 300 N/mm rate, which is a fairly stiff spring that provides a noticeable improvement in body control during aggressive driving and cornering. The linear rate means the spring's stiffness increases consistently as it's compressed, offering predictable handling characteristics.

Measuring 100mm in length with a 61mm inner diameter, this spring is designed to fit many common coilover applications. AST is known for making well-built suspension components, and these springs are made to handle the demands of racing and performance driving. They are a solid option when you need a specific spring rate to dial in your suspension's performance for track days or autocross events.