What is a linear spring rate?

A linear spring rate means that for every millimeter the spring is compressed, its resistance increases by a consistent amount (150 N/mm in this case). This provides predictable suspension behavior.

What does the 61mm ID refer to?

ID stands for Inner Diameter. This measurement indicates the diameter of the coilover shock body that the spring is designed to fit onto. Ensure your coilover system uses a 61mm ID spring perch.

Is this spring compatible with any coilover kit?

This spring is designed for coilover systems that accept a 61mm inner diameter spring and have a 120mm length. It's important to verify your existing coilover specifications before purchasing.

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Specifications

Brand: AST
Part #: AST-120-150-61
UPC: astAST-120-150-61

AST Linear Race Springs - 120mm Length x 150 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 120mm Length x 150 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-120mm-length-x-150-n-mm-rate-x-61mm-id-single-t14-329723
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 61mm inner diameter coilover systems.
Features a linear spring rate of 150 N/mm for consistent damping.
Measures 120mm in length.
Sold individually.

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About this part

Product Details

This is a single AST Linear Race Spring, measuring 120mm in length with a spring rate of 150 N/mm and a 61mm inner diameter. These springs are designed for performance applications where precise suspension control is critical. The linear rate means the spring's resistance increases consistently as it's compressed, offering predictable handling characteristics.

AST springs are well-built for demanding use, often found in track day setups or modified street cars. The 150 N/mm rate is a moderately stiff spring, suitable for vehicles where improved body control and reduced roll are desired, especially when paired with appropriate dampers. The 61mm inner diameter is a common size for many coilover systems, making it a versatile option for custom builds or replacements.