What is the purpose of helper springs on a coilover?

Helper springs are used on coilovers to maintain tension on the main spring, even when the suspension is fully extended. This helps prevent the main spring from becoming loose and can assist in achieving precise preload settings during setup.

What does the spring rate of 40 N/mm mean?

A spring rate of 40 N/mm indicates the force required to compress the spring by one millimeter. This is a relatively light spring rate, designed to provide a small amount of assistance without significantly altering the main spring's performance.

Are these springs sold individually or as a set?

These AST helper springs are sold as a set of two, providing the necessary components for one axle of your vehicle's suspension.

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-70-40-75
UPC: astAST-70-40-75

AST Helper Springs - 70mm Length x 40 N/mm Rate x 75mm ID - Set of 2

Name: AST Helper Springs - 70mm Length x 40 N/mm Rate x 75mm ID - Set of 2
Brand: AST
SKU: ast-ast-helper-springs-70mm-length-x-40-n-mm-rate-x-75mm-id-set-of-2-t14-329918
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.

AST Helper Springs - 70mm Length x 40 N/mm Rate x 75mm ID - Set of 2. Improve coilover preload adjustment.

Key Features

Set of 2 AST helper springs.
Each spring is 70mm in length.
Features a 40 N/mm spring rate.
Has a 75mm inner diameter.
Designed to aid in coilover preload adjustment.

Secure CheckoutFast Shipping631-982-0042

About this part

Product Details

When you're setting up your coilovers, getting the right preload can make a big difference in how your car handles. These helper springs from AST are designed to give you a bit more room to work with when setting that initial spring tension. They're a well-built addition to your suspension setup, especially if you're looking for finer control over your ride height and corner balancing.

Each spring measures 70mm in length and has a spring rate of 40 N/mm, with an inner diameter of 75mm. This specific sizing is common for many coilover applications, helping to ensure a proper fit. Having these helper springs means you can achieve the desired preload without putting excessive stress on your main springs or requiring overly complex adjustment procedures. They work alongside your main coilover springs to maintain tension even when the suspension is fully extended, which can help keep things quiet and prevent unwanted movement.