What is a linear spring rate?

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

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 body or perch of your coilover assembly.

How do I know if this spring rate is right for my car?

Choosing the correct spring rate depends on several factors, including your vehicle's weight, how you plan to use the car (daily driving, track use, racing), and your personal preference for ride stiffness. A 400 N/mm rate is generally considered firm and is often used in performance applications.

AST Linear Race Spring 120mm 400 N/mm 61mm ID AST-120-400-61

Name: AST Linear Race Springs - 120mm Length x 400 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-400-n-mm-rate-x-61mm-id-single-t14-329738
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 120mm Length x 400 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 x 400 N/mm Rate x 61mm ID - Single

Key Features

This product includes one (1) AST Linear Race Spring.
Spring measures 120mm in length.
Features a spring rate of 400 N/mm.
Has a 61mm inner diameter.
Linear spring design offers consistent force increase with compression.

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Product Details

This listing is for a single AST Linear Race Spring. You get one spring, measuring 120mm in length with a 400 N/mm spring rate and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is crucial.

The linear spring rate means that as the spring is compressed, the force it exerts increases at a constant rate. This predictable behavior is important 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 or those looking to replace individual springs.

When building or rebuilding a coilover setup, selecting the right spring rate is key to achieving the desired handling characteristics. A 400 N/mm rate offers a firm ride, suitable for vehicles where reduced body roll and improved feedback are priorities. Remember that spring selection often depends on vehicle weight, intended use, and overall suspension geometry.