What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force required to compress it increases by a consistent amount (120 N/mm in this case). This predictability is valued in performance applications for tuning suspension.

What does the 61mm ID refer to?

ID stands for Inner Diameter. The 61mm measurement indicates the inside diameter of the spring, which is important for ensuring it fits correctly onto the shock absorber body or spring perch of a coilover system.

Is this spring sold individually?

Yes, this listing is for a single spring. If you need a set for your vehicle, you will need to purchase multiple springs to match your suspension setup.

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Specifications

Brand: AST
Part #: AST-120-120-61
UPC: astAST-120-120-61

AST Linear Race Springs - 120mm Length x 120 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 120mm Length x 120 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-120-n-mm-rate-x-61mm-id-single-t14-329720
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 120mm.
Spring rate is 120 N/mm.
Inner diameter is 61mm.
Linear spring design offers consistent rate throughout travel.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring, measuring 120mm in length with a spring rate of 120 Newtons per millimeter and an inner diameter of 61mm. These springs are designed for performance applications where precise suspension control is critical.

Linear race springs are built to provide a consistent spring rate throughout their travel, meaning the force required to compress the spring increases predictably as it's compressed. This predictability is essential for tuning suspension geometry and maintaining optimal tire contact with the road during aggressive driving or track use. The 61mm inner diameter is a common size for many coilover systems, and the 120 N/mm rate offers a firm setup suitable for performance vehicles.