What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, the force required to compress it further increases by a fixed amount (170 N/mm in this case). This provides predictable suspension behavior.

What does the 61mm ID refer to?

ID stands for Inner Diameter. This 61mm measurement is the diameter of the hole in the center of the spring, which needs to match the diameter of the shock body or perch it will sit on.

Can I mix and match these springs with other brands?

While the dimensions might match, it's generally recommended to use springs from the same manufacturer or a matched set for optimal suspension balance and performance. Mixing rates or types can lead to unpredictable handling.

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Specifications

Brand: AST
Part #: AST-140-170-61
UPC: astAST-140-170-61

AST Linear Race Springs - 140mm Length x 170 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 140mm Length x 170 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-140mm-length-x-170-n-mm-rate-x-61mm-id-single-t14-329779
Price: 103.36 USD
Availability: BackOrder

$103.36

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Key Features

This product is a single AST Linear Race Spring.
The spring measures 140mm in length.
It has a spring rate of 170 N/mm.
The inner diameter of the spring is 61mm.
Linear rate springs offer a consistent spring rate throughout their travel.

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About this part

Product Details

This listing is for a single AST Linear Race Spring. You get one spring measuring 140mm in length with a spring rate of 170 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where a consistent and predictable spring rate is crucial for handling and suspension response.

Linear rate springs, like this one from AST, offer a straightforward spring rate that doesn't change with compression. This means the suspension behaves predictably under load, which is important for track use or spirited driving. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for builders or those looking to replace individual springs. The 140mm length and 170 N/mm rate are specific choices for tuning suspension stiffness and travel.