What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force required to compress it further increases by a consistent amount (240 N/mm in this case). This provides predictable suspension behavior.

What does the 61mm ID refer to?

The 61mm ID (Inner Diameter) specifies the size of the perch or mount the spring will sit on within your coilover assembly. Ensure your existing coilover hardware matches this dimension for a proper fit.

Is this spring sold individually or as a set?

This listing is for a single spring. If you need a set for your vehicle, you will need to purchase four springs.

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Specifications

Brand: AST
Part #: AST-150-240-61
UPC: astAST-150-240-61

AST Linear Race Springs - 150mm Length x 240 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 150mm Length x 240 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-150mm-length-x-240-n-mm-rate-x-61mm-id-single-t14-329810
Price: 103.36 USD
Availability: BackOrder

$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.

Key Features

This product includes one (1) AST Linear Race Spring.
Spring length is 150mm.
Spring rate is 240 N/mm.
Inner diameter is 61mm.
Linear spring design offers consistent rate throughout compression.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring, measuring 150mm in length with a spring rate of 240 Newtons per millimeter. The inner diameter is 61mm, making it suitable for coilovers with a 61mm ID perch.

These springs are built for performance applications where a consistent spring rate is crucial. The linear design means the spring rate doesn't change significantly throughout its compression, offering predictable handling. This makes them a solid option for track day setups or any build where precise suspension feedback is desired. The 150mm length and 240 N/mm rate are common specifications for many performance coilovers, offering a good balance of travel and stiffness.