What does a linear spring rate mean for my suspension?

A linear spring rate means the force the spring exerts increases at a constant rate as it's compressed. This provides predictable and consistent suspension behavior, which is beneficial for performance tuning and track use.

What is the inner diameter of this spring?

This AST Linear Race Spring has an inner diameter of 61mm. This is a common size for many aftermarket coilover systems, but it's always best to verify your existing setup.

Does this spring come with any hardware?

This product listing is for a single spring only. Any necessary hardware, such as spring perches or collars, would typically be part of a complete coilover kit or purchased separately.

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Specifications

Brand: AST
Part #: AST-300-30-61
UPC: astAST-300-30-61

AST Linear Race Springs - 300mm Length x 30 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 30 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-30-n-mm-rate-x-61mm-id-single-t14-329893
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 61mm inner diameter coilover applications.
Spring rate is 30 N/mm for consistent suspension response.
Spring length is 300mm.
Linear spring design offers predictable force application.
Single spring sold individually.

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About this part

Product Details

This is a single AST Linear Race Spring, measuring 300mm in length with a spring rate of 30 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is critical.

The linear spring rate means that as the spring is compressed, the force it exerts increases proportionally. This predictable behavior is essential for tuning suspension response, especially in racing or track-day setups. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for builders and tuners looking to customize their suspension geometry. The 300mm length offers a good balance for achieving desired ride height and travel characteristics.