What is a linear spring rate?

A linear spring rate means that the force the spring exerts increases proportionally to how much it is compressed. For every millimeter the spring is compressed, the force increases by the same amount (110 N/mm in this case). This provides predictable suspension behavior.

What does the 61mm ID refer to?

ID stands for Inner Diameter. The 61mm measurement indicates the inside diameter of the spring. This is important for ensuring the spring fits correctly onto the shock absorber body or spring perch of your coilover assembly.

Are these springs sold individually?

Yes, this listing is for a single spring. If you are replacing springs on a coilover assembly, you will typically need two springs per assembly (front or rear axle), so be sure to order the correct quantity for your needs.

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Specifications

Brand: AST
Part #: AST-120-110-61
UPC: astAST-120-110-61

AST Linear Race Springs - 120mm Length x 110 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 120mm Length x 110 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-110-n-mm-rate-x-61mm-id-single-t14-329719
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

Linear spring rate of 110 N/mm for consistent suspension response.
Spring length is 120mm, suitable for many performance coilover applications.
Inner diameter measures 61mm, a common size for aftermarket coilovers.
Designed for track use where precise suspension control is important.

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About this part

Product Details

If you're building or rebuilding a performance suspension setup, choosing the right coilover springs is key to dialing in your car's handling. These linear race springs from AST are designed for serious track use, offering a consistent spring rate that helps maintain predictable chassis behavior during aggressive driving.

With a length of 120mm and a spring rate of 110 N/mm, these springs are well-suited for applications where a firm, responsive ride is desired. The 61mm inner diameter is a common size for many performance coilover systems, making them a versatile option for custom builds or replacements. The linear rate means that as the spring compresses, the force increases proportionally, which helps in controlling body roll and maintaining tire contact during cornering.