What does a linear spring rate mean?

A linear spring rate means that for every millimeter the spring is compressed, its resistance increases by the same amount. This provides predictable and consistent suspension behavior, which is beneficial for performance driving.

What is the inner diameter of this spring?

This AST Linear Race Spring has an inner diameter of 61mm. This is a common size for many aftermarket coilover systems, but you should verify it matches your existing or planned coilover hardware.

Is this spring sold individually?

Yes, this product listing is for a single AST Linear Race Spring. If you are rebuilding a coilover set, you will need to purchase the appropriate number of springs for your application.

AST Linear Race Spring 180mm 90 N/mm 61mm ID AST-180-90-61

Name: AST Linear Race Springs - 180mm Length x 90 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-180mm-length-x-90-n-mm-rate-x-61mm-id-single-t14-329831
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 180mm Length x 90 N/mm Rate x 61mm ID - Single

$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.

AST Linear Race Springs - 180mm Length x 90 N/mm Rate x 61mm ID - Single

Key Features

Fits vehicles with compatible coilover systems.
Spring dimensions: 180mm length, 90 N/mm rate, 61mm inner diameter.
Linear spring rate provides consistent resistance.
Designed for performance and track applications.

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Product Details

This is a single AST Linear Race Spring, measuring 180mm in length with a spring rate of 90 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is needed.

The linear rate means the spring's resistance increases consistently as it's compressed, offering predictable handling characteristics. This makes them a solid option for track day setups or modified vehicles where a firmer, more responsive suspension is desired. The 61mm inner diameter is a common size for many coilover systems, but it's always best to confirm compatibility with your specific setup.

When building or rebuilding a coilover, choosing the right spring rate is crucial for tuning your vehicle's handling. A 90 N/mm rate offers a significant increase in stiffness over stock springs, which can improve cornering stability and reduce body roll. Remember to check the manufacturer's recommendations for your vehicle and intended use to ensure these springs are the right fit for your performance goals.