What does a linear spring rate mean?

A linear spring rate means that for every unit of compression, the spring exerts a proportional amount of force. This results in a predictable and consistent suspension response, which is beneficial for performance tuning.

How many springs do I need to order?

This product is sold as a single spring. You will need to determine the correct number of springs required for your specific coilover setup, which typically involves four springs for a complete vehicle application.

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 it's always best to verify compatibility with your existing components.

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Specifications

Brand: AST
Part #: AST-140-70-61
UPC: astAST-140-70-61

AST Linear Race Springs - 140mm Length x 70 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 140mm Length x 70 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-140mm-length-x-70-n-mm-rate-x-61mm-id-single-t14-329769
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

This is a single AST Linear Race Spring.
Spring measures 140mm in length.
Features a spring rate of 70 N/mm.
Has a 61mm inner diameter.
Linear spring design offers predictable force increase with compression.

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About this part

Product Details

This is a single AST Linear Race Spring, measuring 140mm in length with a spring rate of 70 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is critical.

The linear spring rate means that as the spring is compressed, the force it exerts increases at a constant rate. This predictable behavior is essential for tuning suspension response, especially in racing or track day setups. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for builders and tuners looking to customize their suspension.

When building or rebuilding coilovers, selecting the right spring rate is key to achieving the desired handling characteristics. A 70 N/mm rate offers a firmer ride than stock, which can improve cornering stability and reduce body roll. This spring is sold individually, so you'll need to order the correct quantity for your specific application.