What is a linear spring rate?

A linear spring rate means the spring's resistance increases at a constant rate as it's compressed. This provides predictable suspension behavior, which is often preferred for performance applications where consistent handling is important.

What does the 61mm ID refer to?

The 61mm ID (Inner Diameter) specifies the size of the spring's opening. This is important for ensuring the spring correctly fits onto the spring perch of your coilover shock absorber.

Are these springs sold individually?

Yes, these AST Linear Race Springs are sold as single units, allowing you to purchase the exact number needed for your specific coilover setup.

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Specifications

Brand: AST
Part #: AST-140-50-61
UPC: astAST-140-50-61

AST Linear Race Springs - 140mm Length x 50 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 140mm Length x 50 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-140mm-length-x-50-n-mm-rate-x-61mm-id-single-t14-329767
Price: 103.36 USD
Availability: BackOrder

$103.36

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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 - 140mm Length x 50 N/mm Rate x 61mm ID - Single. For performance suspension tuning.

Key Features

Linear spring rate of 50 N/mm for predictable suspension response.
140mm length is suitable for many performance coilover applications.
61mm inner diameter fits coilovers designed for this spring size.
Constructed for performance tuning and track-oriented setups.

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About this part

Product Details

When you're setting up a performance suspension, getting the spring rate just right is key to balancing handling and ride comfort. These AST Linear Race Springs are designed for that precise tuning. With a 140mm length and a 50 N/mm spring rate, they offer a well-defined stiffness that helps control body roll during spirited driving or track use.

The 61mm inner diameter means these springs are intended for use with coilovers that accept this specific size, allowing for a secure fitment within the spring perch. Linear rate springs offer a consistent force increase as they compress, making suspension behavior predictable and easier to manage for experienced tuners. This makes them a solid option for those looking to dial in their vehicle's suspension for a specific purpose, whether it's for autocross, track days, or just a more responsive street feel.