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

A linear spring rate means the force the spring exerts increases at a constant rate as it's compressed. This provides predictable handling characteristics and consistent suspension response, which is beneficial for track driving and performance tuning.

Can I mix and match spring rates with this product?

Yes, these springs are sold individually. This allows you to use different spring rates on the front and rear axles, or even on opposite sides if your tuning strategy calls for it, to fine-tune your vehicle's balance.

What does the 61mm ID specification mean?

The 61mm ID refers to the inner diameter of the spring. This measurement is crucial for ensuring the spring fits correctly onto the shock body or perch of your coilover assembly.

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Specifications

Brand: AST
Part #: AST-300-140-61
UPC: astAST-300-140-61

AST Linear Race Springs - 300mm Length x 140 N/mm Rate x 61mm ID - Single

Name: AST Linear Race Springs - 300mm Length x 140 N/mm Rate x 61mm ID - Single
Brand: AST
SKU: ast-ast-linear-race-springs-300mm-length-x-140-n-mm-rate-x-61mm-id-single-t14-329911
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

AST linear race spring with a 140 N/mm spring rate.
Spring measures 300mm in length.
Features a 61mm inner diameter.
Sold as a single unit for custom tuning or replacement.

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About this part

Product Details

AST is known for making suspension components that perform well on the track. This linear race spring is a good example, offering a specific spring rate for predictable handling. It measures 300mm in length with a 61mm inner diameter, designed to work with many coilover setups.

The 140 N/mm spring rate is a solid choice for drivers looking for a firmer ride and improved body control during spirited driving or track use. Linear springs offer a consistent force increase as they compress, which helps maintain tire contact with the road over bumps and during hard cornering. This particular spring is sold individually, so you can mix and match rates or replace just one if needed for your specific suspension tuning project.