What is the difference between a linear and a progressive spring?

A linear spring has a constant spring rate, meaning it gets stiffer by the same amount for every inch it's compressed. A progressive spring's rate increases as it's compressed further. Linear springs offer more predictable handling for track use.

What does a 90 N/mm spring rate mean for my car?

A 90 N/mm spring rate is a moderately stiff rate. It will firm up your suspension, reducing body roll during cornering and improving responsiveness. This rate is often chosen for performance driving or track applications where sharper handling is desired.

Is this spring compatible with any coilover kit?

This spring has a 61mm inner diameter, which is a common size for many coilover systems. However, it's important to verify that your specific coilover kit is designed to accept springs of this diameter and length to ensure proper fitment.

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Specifications

Brand: AST
Part #: AST-250-90-61
UPC: astAST-250-90-61

AST Linear Race Springs - 250mm Length x 90 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 250mm Length x 90 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-250mm-length-x-90-n-mm-rate-x-61mm-id-single-t14-329884
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

You receive one (1) AST Linear Race Spring.
Spring length is 250mm.
Spring rate is 90 N/mm.
Inner diameter is 61mm.
Linear spring design offers a consistent rate throughout compression.

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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 90 Newtons per millimeter and an inner diameter of 61mm. These springs are designed for performance applications where a consistent spring rate is crucial for predictable handling.

Linear race springs like these offer a straightforward spring rate that doesn't change significantly throughout its compression. This predictability is valued by racers and serious track enthusiasts for tuning suspension response. The 61mm inner diameter is a common size for many coilover systems, making it a popular choice for those looking to replace or upgrade their existing springs. The 90 N/mm rate is a moderately stiff rate, suitable for vehicles where improved body control and reduced roll are desired during spirited driving or track use.