What is a linear spring rate?

A linear spring rate means the force the spring exerts increases proportionally to how much it's compressed. For every millimeter the spring is compressed, it pushes back with the same amount of force. This makes suspension behavior predictable and consistent.

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 performance coilover applications, but it's always best to measure your existing spring or shock body to ensure compatibility.

What kind of vehicle is this spring best suited for?

This spring is intended for performance and race vehicles where a firm, responsive suspension is desired. The 140 N/mm rate is significantly stiffer than stock and is meant for track use, autocross, or dedicated performance builds.

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Specifications

Brand: AST
Part #: AST-250-140-61
UPC: astAST-250-140-61

AST Linear Race Springs - 250mm Length x 140 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 250mm Length x 140 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-250mm-length-x-140-n-mm-rate-x-61mm-id-single-t14-329890
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

Linear spring rate of 140 N/mm for consistent suspension response.
250mm length and 61mm inner diameter fit many coilover systems.
Designed for performance and track applications where precise handling is needed.

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About this part

Product Details

If you're building or rebuilding a performance suspension setup, choosing the right spring rate is key to dialing in your car's handling. These AST Linear Race Springs are designed for track use, offering a consistent spring rate throughout their travel. The 140 N/mm rate provides a firm, responsive feel, ideal for reducing body roll and improving cornering stability on a race car or a dedicated track vehicle.

Measuring 250mm in length with a 61mm inner diameter, these springs are built to fit many common coilover applications. The linear rate means that as the spring compresses, the force increases proportionally, which helps maintain predictable suspension behavior under load. This consistency is crucial for setting up a suspension that responds accurately to driver inputs and track conditions.