What is a linear spring rate?

A linear spring rate means the force the spring exerts increases proportionally to how much it's compressed. For every millimeter you compress it, it pushes back with a consistent amount of force (300 N/mm in this case). This makes the suspension's behavior very predictable.

What does the 61mm ID mean?

ID stands for Inner Diameter. The 61mm measurement tells you the diameter of the hole in the center of the spring. This is important to ensure it fits correctly onto the perch or body of your coilover shock absorber.

Can I mix and match spring rates?

While it's possible, it's generally recommended to use matching spring rates on the same axle (front or rear) for balanced handling. Using different rates can negatively affect your vehicle's balance and cornering characteristics.

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Specifications

Brand: AST
Part #: AST-80-300-61
UPC: astAST-80-300-61

AST Linear Race Springs - 80mm Length x 300 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 80mm Length x 300 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-80mm-length-x-300-n-mm-rate-x-61mm-id-single-t14-329684
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.

Key Features

Fits: Check manufacturer fitment data to confirm compatibility with your vehicle.
Spring Type: Linear rate for consistent force throughout compression.
Dimensions: 80mm length, 61mm inner diameter.
Spring Rate: 300 N/mm, offering a firm ride for improved handling.
Single spring sold individually.

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About this part

Product Details

This is a single AST Linear Race Spring. It measures 80mm in length, has a spring rate of 300 Newtons per millimeter, and an inner diameter of 61mm. These springs are designed for performance applications where precise suspension control is needed.

Linear rate springs offer a consistent spring force throughout their compression range, meaning the stiffness doesn't change as the suspension moves. This predictability is crucial for tuning a vehicle's handling, especially in racing or track day setups. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for custom builds or replacements.

When selecting springs, consider the overall weight of your vehicle and your intended use. A 300 N/mm rate is a moderately stiff spring, suitable for vehicles where improved body control and reduced roll are desired. Always ensure compatibility with your existing coilover bodies or suspension components before installation.