What is a linear spring rate?

A linear spring rate means that the force the spring exerts increases proportionally to how much it is compressed. For every millimeter of compression, the spring pushes back with the same amount of force, offering predictable handling.

What does the 61mm ID refer to?

ID stands for Inner Diameter. The 61mm measurement indicates the diameter of the hole in the center of the spring, which is important for fitting onto the shock body of a coilover.

Are these springs sold individually?

Yes, these AST Linear Race Springs are sold individually. You will need to purchase the correct quantity and rates to match your specific suspension setup.

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Specifications

Brand: AST
Part #: AST-140-90-61
UPC: astAST-140-90-61

AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 140mm Length x 90 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-140mm-length-x-90-n-mm-rate-x-61mm-id-single-t14-329771
Price: 85.50 USD
Availability: InStock

$85.50

Only 2 left in stock

AST Linear Race Springs: 140mm length, 90 N/mm rate, 61mm ID. Ideal for performance builds needing precise spring rates.

Key Features

Linear spring rate of 90 N/mm for predictable suspension response.
Spring measures 140mm in length.
Features a 61mm inner diameter, a common size for many coilover applications.
Designed for performance and track-oriented vehicles.
Well-built construction helps maintain rate consistency.

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About this part

Product Details

Starting with a 90 N/mm spring rate and a 140mm length, these AST Linear Race Springs are built for performance applications where precise suspension control is key. The 61mm inner diameter is a common size for many coilover setups, making them a versatile option for builders looking to fine-tune their suspension. These springs are designed to work as part of a complete coilover system, offering a consistent and predictable response under load.

Constructed from well-built materials, these springs are intended to maintain their intended rate over time and through repeated cycles. The linear rate means that for every millimeter the spring compresses, it exerts the same amount of force, which translates to predictable handling characteristics. This makes them a solid choice for track day cars or any vehicle where consistent suspension feedback is important for driver confidence.