What is a linear spring rate and why is it important?

A linear spring rate means the spring's resistance to compression is constant. For every inch the spring is compressed, it exerts the same amount of force. This predictability is valuable for tuning suspension geometry and maintaining consistent tire contact.

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. This needs to match the diameter of the coilover shock body or spring perch it will sit on.

What kind of vehicles is a 65 N/mm spring rate typically used for?

A 65 N/mm spring rate is a moderate performance rate. It's often used for lighter to medium-weight vehicles that are being set up for track use or spirited driving, offering improved body control over stock springs.

AST Linear Race Spring 250mm 65 N/mm 61mm ID AST-250-65-61

Name: AST Linear Race Springs - 250mm Length x 65 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-250mm-length-x-65-n-mm-rate-x-61mm-id-single-t14-329879
Price: 103.36 USD
Availability: BackOrder

AST Linear Race Springs - 250mm Length x 65 N/mm Rate x 61mm ID - Single

$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.

AST Linear Race Springs: 250mm length, 65 N/mm rate, 61mm ID. Ideal for performance builds needing precise spring rates.

Key Features

This is a single AST Linear Race Spring.
Features a 65 N/mm spring rate for controlled suspension response.
Measures 250mm in length, a common size for coilover applications.
Has a 61mm inner diameter, compatible with many coilover shock bodies.
Constructed from high-tensile steel for durability and consistent performance.

Secure CheckoutFast Shipping631-982-0042

Product Details

Starting with a 65 N/mm spring rate and a 250mm 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 it a versatile option for builders looking to fine-tune their vehicle's handling characteristics. These springs are designed to provide a consistent and predictable response under load, which is crucial for track use or spirited driving.

Constructed from high-tensile steel, these linear rate springs offer a well-defined spring rate throughout their travel. This means that for every inch the spring is compressed, it exerts the same amount of force, allowing for predictable suspension geometry changes. This consistency helps maintain tire contact with the road surface, improving grip and stability during cornering and braking. The 250mm length is a standard size that fits many popular coilover shock bodies, simplifying installation for those rebuilding or upgrading their suspension.

When selecting springs for a performance build, matching the spring rate to the vehicle's weight and intended use is critical. A 65 N/mm rate is a moderate performance rate, suitable for many lighter to medium-weight vehicles seeking improved body control without an overly harsh ride. Always ensure the inner diameter and length are compatible with your existing or planned coilover hardware.