What is a linear spring rate?

A linear spring rate means that for every unit of compression, the spring exerts a proportional amount of force. This results in predictable suspension behavior, which is beneficial for performance driving and racing.

What does the 61mm ID refer to?

The 61mm ID refers to the inner diameter of the spring. This measurement is crucial for ensuring the spring fits correctly onto the shock absorber body or perch of your coilover system.

How many springs are included in this purchase?

This listing is for a single AST Linear Race Spring. If you need a set for your vehicle, you will need to purchase multiple springs.

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Specifications

Brand: AST
Part #: AST-250-75-61
UPC: astAST-250-75-61

AST Linear Race Springs - 250mm Length x 75 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 250mm Length x 75 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-250mm-length-x-75-n-mm-rate-x-61mm-id-single-t14-329881
Price: 103.36 USD
Availability: BackOrder

$103.36

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

This product includes one (1) AST Linear Race Spring.
Spring length is 250mm.
Spring rate is 75 N/mm.
Inner diameter is 61mm.
Linear spring rate offers consistent force application.
Designed for performance and track applications.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring measuring 250mm in length with a spring rate of 75 Newtons per millimeter and an inner diameter of 61mm. These springs are designed for performance applications where precise suspension control is needed.

Linear rate springs offer a consistent force increase as they are compressed, meaning the suspension's stiffness changes predictably. This makes them a popular choice for track cars or builds where predictable handling is a priority. The 61mm inner diameter is a common size for many coilover systems, and the 75 N/mm rate offers a firm setup suitable for spirited driving or racing conditions.

When installing these springs, ensure they are properly seated and compatible with your existing coilover hardware. Always refer to your coilover manufacturer's installation guide for specific details.