What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force it exerts increases by a consistent amount. In this case, for every millimeter of compression, the spring exerts 85 Newtons of force. This predictable behavior is valued in performance suspension tuning.

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 fit correctly onto the perch or sleeve of your coilover shock absorber.

Is this spring sold individually or as a set?

This product listing is for a single spring. If you need a set of springs for your vehicle, you will need to purchase multiple individual springs.

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Specifications

Brand: AST
Part #: AST-300-85-61
UPC: astAST-300-85-61

AST Linear Race Springs - 300mm Length x 85 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 85 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-85-n-mm-rate-x-61mm-id-single-t14-329904
Price: 103.36 USD
Availability: BackOrder

$103.36

On Backorder

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AST Linear Race Springs - 300mm Length x 85 N/mm Rate x 61mm ID - Single. Get a single, well-built spring for your suspension build.

Key Features

This product is a single AST Linear Race Spring.
Spring length is 300mm.
Spring rate is 85 N/mm.
Inner diameter is 61mm.
Linear spring design for predictable force increase.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring with a length of 300mm, a spring rate of 85 Newtons per millimeter, and an inner diameter of 61mm. These springs are designed for performance applications where precise suspension control is needed.

The linear spring design means that as the spring is compressed, the force it exerts increases at a constant rate. This predictable behavior is crucial for tuning suspension setups for specific track conditions or driving styles. The 85 N/mm rate offers a firm but manageable stiffness, suitable for many performance coilovers. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for custom builds or replacements.