What is a linear spring rate?

A linear spring rate means the force the spring exerts increases proportionally to how much it is compressed. For every millimeter the spring is compressed, it pushes back with a consistent amount of force, making suspension behavior predictable.

What is the advantage of a 60 N/mm spring rate?

A 60 N/mm spring rate offers a firmer ride than stock suspension, which helps reduce body roll during cornering and improves responsiveness. It's a popular choice for track days and performance driving where better control is needed.

What does the 61mm ID mean for fitment?

The 61mm ID refers to the inner diameter of the spring. This measurement is critical for ensuring the spring fits correctly onto the shock absorber body or perch of your coilover system. Always verify this dimension matches your existing setup or the specifications for your coilover kit.

FEATURED BRAND = COVERKING CHECK OUT COVERKING NOW →

Questions? Call Us:631-982-0042

M-F 8AM-4PM ET

Trusted Since 1957

Est. 1957

Specifications

Brand: AST
Part #: AST-300-60-61
UPC: astAST-300-60-61

AST Linear Race Springs - 300mm Length x 60 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 60 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-60-n-mm-rate-x-61mm-id-single-t14-329899
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 coilover systems requiring a 61mm inner diameter spring.
Linear spring rate provides consistent damping characteristics.
Spring rate is 60 N/mm, offering a firm yet controlled ride.
Spring length is 300mm.
Designed for performance and racing applications.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

This is a single AST Linear Race Spring, measuring 300mm in length with a spring rate of 60 Newtons per millimeter and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is crucial.

Linear rate springs offer a consistent force increase throughout their compression range, meaning the further they compress, the more resistance they provide in a predictable manner. This characteristic is highly valued in racing and performance driving for its predictable handling and feedback. The 60 N/mm rate is a moderately stiff setting, suitable for track use or spirited driving where improved body control and reduced roll are desired. The 61mm inner diameter is a common size for many aftermarket coilover systems, making it a versatile option for custom builds or replacements.