What is the purpose of a linear spring rate?

A linear spring rate means the spring's resistance to compression increases at a constant rate. This provides predictable handling characteristics, which is important for performance driving and track use where consistent feedback is needed.

What does the 61mm ID specification mean for this spring?

The 61mm ID refers to the inner diameter of the spring. This measurement is critical for ensuring the spring fits correctly onto the body of your coilover shock absorber. Always verify your coilover body diameter matches the spring's ID.

Is this spring suitable for daily driving?

With a rate of 85 N/mm, this spring is quite stiff and primarily intended for racing or track use. While it can be used on a street car, it will result in a significantly firmer ride compared to stock or softer performance springs.

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Specifications

Brand: AST
Part #: AST-200-85-61
UPC: astAST-200-85-61

AST Linear Race Springs - 200mm Length x 85 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 200mm Length x 85 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-200mm-length-x-85-n-mm-rate-x-61mm-id-single-t14-329850
Price: 103.36 USD
Availability: BackOrder

$103.36

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Key Features

This is a single AST linear race coilover spring.
The spring measures 200mm in length.
It has a spring rate of 85 N/mm.
The inner diameter (ID) of the spring is 61mm.
Designed for performance coilover applications.

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About this part

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. This particular spring is designed for coilover setups, offering a 200mm length with a spring rate of 85 Newtons per millimeter. The 61mm inner diameter means it's intended for specific coilover body sizes, ensuring a snug fit on compatible systems.

When you're building or rebuilding a performance suspension, the spring rate is crucial for controlling body roll and maintaining tire contact during aggressive driving. An 85 N/mm rate is a fairly stiff setting, suitable for track use or spirited driving where precise handling is a priority. These springs are built to handle the demands of racing, providing consistent performance lap after lap.