What does a linear spring rate mean for my car?

A linear spring rate means the force required to compress the spring increases at a constant rate. This provides predictable handling and suspension response, which is beneficial for performance driving and track use.

What is the inner diameter (ID) of this spring?

This AST linear race spring has an inner diameter of 61mm. This is a common size for many performance coilover systems, but it's always best to verify your existing setup.

What is the spring rate of this AST spring?

This spring has a rate of 300 Newtons per millimeter (N/mm). This indicates a relatively stiff spring, suitable for performance applications where reduced body roll and precise control are desired.

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Specifications

Brand: AST
Part #: AST-150-300-61
UPC: astAST-150-300-61

AST Linear Race Springs - 150mm Length x 300 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 150mm Length x 300 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-150mm-length-x-300-n-mm-rate-x-61mm-id-single-t14-329813
Price: 103.36 USD
Availability: BackOrder

$103.36

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Key Features

Fits vehicles with 61mm ID coilover applications.
Features a linear spring rate of 300 N/mm for consistent performance.
Measures 150mm in length.
Designed for performance and racing applications.

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About this part

Product Details

AST is a well-known name in the performance suspension world, and these linear race springs are a testament to that reputation. This specific spring measures 150mm in length with a spring rate of 300 Newtons per millimeter, and it features a 61mm inner diameter, making it suitable for many coilover applications where precise spring rates are critical for handling and ride control.

Linear springs like these offer a consistent spring rate throughout their travel, meaning the force required to compress the spring increases predictably. This predictability is essential for tuning suspension performance, especially in racing or track day setups where fine adjustments can make a significant difference in vehicle dynamics. The 61mm inner diameter is a common size for many performance coilover systems, allowing for broad compatibility when replacing worn or upgrading existing springs.