What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, its resistance increases by the same amount (35 N/mm in this case). This provides consistent and predictable suspension behavior.

What does the 61mm ID refer to?

ID stands for Inner Diameter. The 61mm measurement indicates the diameter of the coilover shock body or perch that this spring is designed to fit onto.

Are these springs sold in pairs?

No, this product listing is for a single AST Linear Race Spring. If you need a pair for your vehicle, you will need to purchase two individual springs.

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Specifications

Brand: AST
Part #: AST-300-35-61
UPC: astAST-300-35-61

AST Linear Race Springs - 300mm Length x 35 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 35 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-35-n-mm-rate-x-61mm-id-single-t14-329894
Price: 103.36 USD
Availability: BackOrder

$103.36

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

Fits vehicles with 61mm inner diameter coilover mounts.
Linear spring rate of 35 N/mm offers predictable suspension response.
Spring length is 300mm.
Single spring sold individually.

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About this part

Product Details

This is a single AST Linear Race Spring, measuring 300mm in length with a spring rate of 35 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is critical. The linear rate means the spring's resistance increases uniformly as it's compressed, offering predictable handling characteristics.

Crafted for durability and consistent performance, these springs are a solid option for track day setups or modified street cars seeking improved suspension response. The 61mm inner diameter is a common size for many coilover systems, making it a versatile choice for builders. When selecting springs, matching the rate to your vehicle's weight and intended use is key for optimal handling and ride comfort.