What is the purpose of a helper spring?

Helper springs are used to maintain the correct preload on your main coilover spring. They also prevent the main spring from unseating or rattling when the suspension is at full droop, which is common in lowered vehicles.

What does the spring rate (N/mm) mean?

The spring rate indicates how much force is needed to compress the spring. A rate of 40 N/mm means that 40 Newtons of force are required to compress the spring by one millimeter.

How do I know if this spring will fit my coilovers?

These helper springs have a 61mm inner diameter. You should measure the outer diameter of your coilover shock body where the spring will sit to ensure a proper fit.

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Specifications

Brand: AST
Part #: AST-70-40-61
UPC: astAST-70-40-61

AST Helper Springs - 70mm Length x 40 N/mm Rate x 61mm ID - Set of 2

Name: AST Helper Springs - 70mm Length x 40 N/mm Rate x 61mm ID - Set of 2
Brand: AST
SKU: ast-ast-helper-springs-70mm-length-x-40-n-mm-rate-x-61mm-id-set-of-2-t14-329916
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

Set includes two helper springs.
Spring rate is 40 N/mm.
Spring length is 70mm.
Inner diameter is 61mm.
Designed to maintain preload and prevent spring unseating.

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About this part

Product Details

With a 40 N/mm spring rate and a 70mm length, these helper springs from AST are designed to work with your existing coilover setup. The 61mm inner diameter ensures a proper fit on many common coilover shock bodies. Helper springs are used to maintain preload on the main spring and prevent the spring from unseating when the suspension is fully extended, especially in lowered vehicles.

These springs are well-built for their intended purpose, helping to keep your suspension components properly seated and ensuring consistent performance. They are a popular choice for those looking to fine-tune their suspension geometry or address issues with spring chatter on lowered cars. The set includes two springs, providing what you need for one axle.