What is a linear spring rate?

A linear spring rate means the spring's resistance to compression increases at a constant rate. For every millimeter the spring is compressed, it pushes back with the same amount of force. This predictability is valued in performance applications.

What does the 61mm ID refer to?

The 61mm ID refers to the inner diameter of the spring. This measurement is important for ensuring the spring fits correctly onto the shock body or perch of a coilover assembly.

Are these springs suitable for daily driving?

These are race springs designed for performance. While they can be used on a street car for a firmer feel, they will likely result in a less comfortable ride compared to softer, standard springs.

AST Linear Race Spring 120mm 50 N/mm 61mm ID AST-120-50-61

Name: AST Linear Race Springs - 120mm Length x 50 N/mm Rate x 61mm ID - Single
Brand: AST
Price: 103.36 USD
Availability: InStock

AST Linear Race Springs - 120mm Length x 50 N/mm Rate x 61mm ID - Single

$103.36

AST Linear Race Springs - 120mm Length x 50 N/mm Rate x 61mm ID - Single

Key Features

This is a single AST Linear Race Spring.
The spring measures 120mm in length.
It has a spring rate of 50 N/mm.
The inner diameter of the spring is 61mm.
Linear spring design offers consistent force throughout compression.

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Product Details

Starting with a 50 N/mm spring rate and a 120mm length, these AST Linear Race Springs are built for performance applications where precise suspension control is key. The 61mm inner diameter is a common size for many performance coilovers, making them a versatile option for builders and tuners. These springs are designed to provide a consistent force throughout their compression range, which helps maintain predictable handling characteristics under demanding driving conditions. They are a well-built component for anyone looking to fine-tune their vehicle's suspension setup for track days or spirited driving.

The linear spring rate means that for every millimeter the spring is compressed, it exerts the same amount of force. This predictability is crucial for setting up a suspension system that responds consistently to bumps and cornering forces. While these are race springs, they can be a good choice for a street car if you're aiming for a firmer, more responsive feel and are willing to accept a reduction in ride comfort. They are a solid option for those who understand the trade-offs and prioritize handling feedback.