What is a linear spring rate?

A linear spring rate means that the force exerted by the spring increases proportionally with its compression. For every millimeter the spring is compressed, the force increases by a consistent amount (60 N/mm in this case). This offers predictable suspension behavior.

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 spring perch of your coilover assembly.

Are these springs sold individually or as a set?

This product listing is for a single spring. If you are replacing springs on a coilover system, you will typically need two springs per axle (front or rear) to maintain balanced suspension performance.

AST Linear Race Spring 140mm 60 N/mm 61mm ID AST-140-60-61

Name: AST Linear Race Springs - 140mm Length x 60 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-140mm-length-x-60-n-mm-rate-x-61mm-id-single-t14-329768
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 140mm Length x 60 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: 140mm length, 60 N/mm rate, 61mm ID. Built for performance suspension setups.

Key Features

Linear spring rate of 60 N/mm for predictable suspension response.
Spring length measures 140mm.
Inner diameter is 61mm, a common size for performance coilovers.
Designed for use in performance suspension systems and coilover applications.
Single spring included.

Secure CheckoutFast Shipping631-982-0042

Product Details

Starting with a 60 N/mm spring rate and a 140mm length, these AST Linear Race Springs are built for serious suspension tuning. The 61mm inner diameter is a common size for many performance coilover applications, making them a versatile choice when you need precise control over your vehicle's ride height and handling characteristics. These springs are designed to work as part of a complete coilover system, where their consistent linear rate helps provide predictable feedback and improved cornering stability.

Crafted with performance in mind, these springs are intended to replace worn or underperforming springs in your existing coilover setup or to be used in a custom suspension build. Their linear rate means that as the spring is compressed, the force increases proportionally, offering a well-defined response that tuners can rely on. This predictability is key for setting up a vehicle for track days or spirited driving, where consistent suspension behavior is crucial for maintaining control.