What does a 150 N/mm spring rate mean for my car's handling?

A 150 N/mm spring rate is considered a firm rate, meaning it will resist compression more than a stock spring. This typically results in a more responsive feel, reduced body roll during cornering, and a more direct connection to the road. It's often used in performance or track-oriented setups.

Are these springs sold individually or as a set?

These AST Linear Race Springs are sold individually. If you are replacing springs on a coilover system, you will typically need two springs per axle, so be sure to order the correct quantity for your application.

What is the inner diameter of this spring?

This AST Linear Race Spring has an inner diameter of 61mm. It's important to ensure this matches the perch diameter of your existing or intended coilover body for a proper fit.

Specifications

Brand: AST
Part #: AST-300-150-61
UPC: astAST-300-150-61

AST Linear Race Springs - 300mm Length x 150 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 150 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-150-n-mm-rate-x-61mm-id-single-t14-329912
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

Fits vehicles with compatible coilover systems requiring a 61mm inner diameter spring.
Features a linear spring rate of 150 N/mm for predictable suspension response.
Measures 300mm in length, a common size for performance coilovers.
Constructed from durable materials for longevity in demanding conditions.
Designed for performance applications where precise suspension control is needed.

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About this part

Product Details

With a 150 N/mm spring rate, these AST Linear Race Springs are built for performance applications where precise suspension control is key. The 300mm length and 61mm inner diameter are common dimensions for many coilover setups, offering a solid foundation for tuning your vehicle's handling characteristics. These springs are designed to work with compatible coilover bodies, providing a consistent and predictable response under load.

Constructed from durable materials, these springs are intended to withstand the rigors of track use and spirited driving. The linear rate means that as the spring is compressed, the force increases proportionally, which helps maintain consistent tire contact with the road surface during cornering and braking. This predictable behavior is crucial for drivers who need to feel confident in their vehicle's suspension response.

When rebuilding or upgrading your coilover system, choosing the right spring rate is essential for achieving your desired handling balance. These AST springs offer a specific rate that can be a good starting point for many performance builds, allowing for fine-tuning of your suspension's performance.