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. In this case, it's 240 Newtons per millimeter. 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 to ensure the spring fits correctly onto the shock body or perch of your coilover assembly.

What is the difference between linear and progressive springs?

Linear springs have a constant rate of stiffness throughout their compression. Progressive springs get stiffer as they are compressed further. Linear springs are often preferred in racing for their predictable feedback.

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Specifications

Brand: AST
Part #: AST-120-240-61
UPC: astAST-120-240-61

AST Linear Race Springs - 120mm Length x 240 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 120mm Length x 240 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-240-n-mm-rate-x-61mm-id-single-t14-329730
Price: 103.36 USD
Availability: BackOrder

$103.36

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Key Features

Fits coilover systems with a 61mm inner diameter.
Linear spring rate of 240 N/mm for predictable suspension response.
Spring measures 120mm in length.
Designed for performance and racing applications.

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About this part

Product Details

AST is known for making performance suspension components. This linear race spring is a solid option if you're building or rebuilding a coilover setup and need a specific spring rate and length. With a 240 N/mm rate, it's designed for a stiffer ride compared to stock springs, offering improved handling response.

This particular spring measures 120mm in length and has a 61mm inner diameter, making it compatible with many coilover bodies. The linear spring rate means that as the spring is compressed, the force increases proportionally. This predictable behavior is favored in racing applications for consistent suspension feedback.