What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force it exerts increases by a consistent amount. In this case, for every millimeter of compression, the spring pushes back with 20 Newtons of force. This provides predictable suspension behavior.

What does the 61mm ID refer to?

ID stands for Inner Diameter. The 61mm measurement indicates the diameter of the hole in the center of the spring. This is important for ensuring the spring fits correctly onto the shock absorber body or perch of your coilover assembly.

Is this spring sold individually or as a set?

This specific listing is for a single spring. If you are rebuilding a coilover system, you will typically need two springs per corner (one main spring and potentially a helper spring, depending on your setup) or four main springs for a full set of coilovers.

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Specifications

Brand: AST
Part #: AST-80-20-61
UPC: astAST-80-20-61

AST Linear Race Springs - 80mm Length x 20 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 80mm Length x 20 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-80mm-length-x-20-n-mm-rate-x-61mm-id-single-t14-329669
Price: 102.60 USD
Availability: InStock

$102.60

Only 2 left in stock

Key Features

This product includes one (1) AST Linear Race Spring.
Spring dimensions: 80mm length, 61mm inner diameter.
Spring rate: 20 N/mm.
Linear spring design for predictable force application.
Common 61mm inner diameter fits many coilover applications.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one coilover spring measuring 80mm in length, with a spring rate of 20 Newtons per millimeter, and an inner diameter of 61mm. These springs are designed for performance applications where precise suspension control is needed.

The linear spring rate means that as the spring is compressed, the force it exerts increases at a constant rate. This predictable behavior is crucial for tuning suspension for specific track conditions or driving styles. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for builders or those looking to replace worn-out springs.

When rebuilding or upgrading your coilover setup, choosing the right spring rate is key to achieving the desired handling characteristics. A 20 N/mm rate is a moderately stiff rate, often used for track-focused vehicles or those seeking a more responsive feel on the street.