What does a linear spring rate mean for my car's handling?

A linear spring rate means the force the spring exerts increases directly in proportion to how much it's compressed. This results in predictable and consistent suspension behavior, which is beneficial for performance driving where precise control is important.

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 performance coilover systems, but it's always best to measure your existing spring or shock body to ensure compatibility.

Is this spring suitable for daily driving?

This spring is part of AST's 'Race' line and features a 55 N/mm rate, which is a moderately firm setting. While it can be used on street-driven vehicles, it's primarily intended for track or performance applications where a firmer ride is desired for improved handling.

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Specifications

Brand: AST
Part #: AST-300-55-61
UPC: astAST-300-55-61

AST Linear Race Springs - 300mm Length x 55 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 55 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-55-n-mm-rate-x-61mm-id-single-t14-329898
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.

AST Linear Race Springs - 300mm Length x 55 N/mm Rate x 61mm ID - Single. For custom coilover builds.

Key Features

This is a single AST Linear Race Spring.
Spring measures 300mm in length.
Features a spring rate of 55 N/mm.
Has a 61mm inner diameter.
Designed for performance and track use.

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About this part

Product Details

When you're building a custom coilover setup or need to replace a worn spring on your AST coilovers, having the right spring rate and dimensions is crucial for dialing in your suspension's performance. This AST Linear Race Spring is designed for track-focused applications where precise control and consistent damping are key. Its linear rate means the spring force increases proportionally with compression, offering predictable handling characteristics.

This particular spring measures 300mm in length and has a spring rate of 55 Newtons per millimeter, which is a moderately firm rate suitable for many performance applications. The 61mm inner diameter is a common size for many performance coilover systems, ensuring it fits correctly onto the shock body. AST is known for making well-built suspension components, and these springs are no exception, offering a solid option for racers and serious track enthusiasts looking to fine-tune their vehicle's ride and handling.