What is a linear spring rate and why is it important?

A linear spring rate means the spring's resistance increases at a constant rate as it's compressed. This predictability is vital for performance driving, as it allows for consistent handling and predictable suspension response during cornering and braking.

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 will properly fit onto the shock body or perch of your coilover system.

Are these springs sold individually or as a set?

These AST Linear Race Springs are sold individually, as indicated by 'Single' in the product title. You will need to purchase the appropriate number of springs for your application.

AST Linear Race Spring 150mm 400 N/mm 61mm ID

Name: AST Linear Race Springs - 150mm Length x 400 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-150mm-length-x-400-n-mm-rate-x-61mm-id-single-t14-329818
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 150mm Length x 400 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 - 150mm Length x 400 N/mm Rate x 61mm ID - Single

Key Features

Fits: Check manufacturer fitment data to confirm compatibility with your vehicle.
Springs are 150mm in length.
Features a linear spring rate of 400 N/mm for consistent force application.
Has a 61mm inner diameter, a common size for performance coilovers.
Designed for performance and track applications.

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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. Designed for serious enthusiasts who need precise control over their vehicle's ride height and stiffness, these springs are built to handle demanding conditions. The linear rate means that as the spring compresses, the force it applies increases at a constant, predictable rate, which is crucial for consistent handling during aggressive driving or track use.

This particular spring measures 150mm in length and has a spring rate of 400 Newtons per millimeter, offering a firm setup that significantly reduces body roll and improves responsiveness. The 61mm inner diameter is a common size for many performance coilover systems, making it a versatile option for custom builds or replacements. When you're looking to fine-tune your suspension for optimal performance, springs like these from AST offer the control and consistency needed to get the most out of your vehicle's handling capabilities.