What is the spring rate of this AST spring?

This AST Linear Race Spring has a spring rate of 420 Newtons per millimeter (N/mm). This indicates how much force is required to compress the spring by a certain distance.

What does 'linear' mean for a spring?

A linear spring means that the force it exerts increases proportionally to how much it is compressed. This provides predictable suspension behavior, which is beneficial for performance driving.

What is the inner diameter of this spring?

The inner diameter of this AST spring is 61mm. This dimension is important for ensuring it fits correctly onto the shock absorber body of a coilover system.

AST Linear Race Spring 120mm 420 N/mm 61mm ID AST-120-420-61

Name: AST Linear Race Springs - 120mm Length x 420 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-420-n-mm-rate-x-61mm-id-single-t14-329739
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 120mm Length x 420 N/mm Rate x 61mm ID - Single

$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.

AST Linear Race Springs: 120mm length, 420 N/mm rate, 61mm ID. Built for performance suspension setups.

Key Features

This is a single AST Linear Race Spring.
The spring rate is 420 N/mm, offering firm damping characteristics.
It measures 120mm in length.
The inner diameter is 61mm, suitable for many performance coilover applications.
Linear spring design provides consistent force throughout compression.

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Product Details

With a spring rate of 420 Newtons per millimeter, these AST Linear Race Springs are built for serious performance applications where precise suspension control is key. The 120mm length and 61mm inner diameter are common dimensions for many performance coilover systems, offering a solid foundation for tuning your vehicle's handling characteristics.

These springs are designed to provide a consistent force throughout their compression range, meaning the suspension response remains predictable even under aggressive driving. This linear characteristic is crucial for track use or spirited driving, as it allows for better feedback and more control when cornering. The well-built construction ensures they can handle the demands of repeated compression and extension, maintaining their intended spring rate over time.

When building or rebuilding a performance suspension, choosing the right spring rate is critical for achieving the desired ride and handling. These AST springs offer a specific rate that can be a great starting point for many custom setups or as a replacement for worn-out springs in a performance coilover kit.