What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force it exerts increases by a consistent amount (400 N/mm in this case). This provides predictable suspension behavior.

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 fits correctly onto the shock absorber body or perch of your coilover setup.

Is this spring suitable for daily driving?

With a rate of 400 N/mm, this spring is quite firm and typically suited for performance or track applications. While it can be used on the street, it will result in a much stiffer ride compared to stock suspension.

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Specifications

Brand: AST
Part #: AST-100-400-61
UPC: astAST-100-400-61

AST Linear Race Springs - 100mm Length x 400 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 100mm Length x 400 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-100mm-length-x-400-n-mm-rate-x-61mm-id-single-t14-329712
Price: 103.36 USD
Availability: BackOrder

$103.36

On Backorder

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Key Features

This product is a single AST Linear Race Spring.
The spring measures 100mm in length.
It features a spring rate of 400 N/mm.
The inner diameter of the spring is 61mm.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring, measuring 100mm in length with a spring rate of 400 N/mm and a 61mm inner diameter. These springs are designed for performance applications where a specific, consistent spring rate is crucial for handling and suspension response.

Linear rate springs, like this one from AST, offer a predictable suspension behavior. As the spring is compressed, the force it exerts increases in direct proportion to the distance it's compressed. This makes them a popular choice for race cars and performance builds where precise control over suspension dynamics is needed. The 61mm inner diameter is a common size for many coilover systems, and the 400 N/mm rate offers a firm setup suitable for track use or aggressive street driving.