What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, it exerts the same amount of force. This provides a predictable and consistent response, which is important for performance tuning and handling.

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 sold individually?

Yes, this product listing is for a single AST linear race spring. If you need a set, you will need to purchase multiple individual springs.

AST Linear Race Spring 220mm 75N/mm 61mm ID AST-220-75-61

Name: AST Linear Race Springs - 220mm Length x 75 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-220mm-length-x-75-n-mm-rate-x-61mm-id-single-t14-329866
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 220mm Length x 75 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 - 220mm Length x 75 N/mm Rate x 61mm ID - Single

Key Features

This is a single AST linear race spring.
The spring has a length of 220mm.
It features a spring rate of 75 N/mm.
The inner diameter (ID) of the spring is 61mm.

Secure CheckoutFast Shipping631-982-0042

Product Details

AST is a well-known name in the performance suspension world, and these linear race springs are a prime example of their focus on track-ready components. This particular spring measures 220mm in length with a spring rate of 75 Newtons per millimeter and a 61mm inner diameter. These specifications make it suitable for applications where precise and consistent suspension response is critical, often used in custom coilover builds or as replacements for worn-out performance springs.

The linear spring design means that the force exerted by the spring increases at a constant rate as it is compressed. This predictable behavior is highly valued in racing and performance driving because it allows for more accurate suspension tuning and predictable handling characteristics. The 61mm inner diameter is a common size for many performance coilovers, and the 75 N/mm rate offers a firm but manageable stiffness for spirited driving or track use, providing a solid connection to the road without being overly harsh for a performance application.