What is the benefit of a progressive spring design?

A progressive spring design means the spring rate changes as it compresses. This allows for a comfortable ride during normal driving, but the spring becomes stiffer under load, like during hard cornering, to reduce body roll and improve handling.

Do these springs come with new bump stops or hardware?

This set includes the lowering springs only. It is recommended to inspect and potentially replace bump stops and other suspension hardware when installing lowering springs, as they may be subject to increased wear.

What is the warranty on these AST lowering springs?

AST backs these lowering springs with a lifetime warranty against breaking. This coverage provides peace of mind for the lifespan of the springs themselves.

Specifications

Brand: AST
Part #: ASTLS-22-307
UPC: ASTLS-22-307

AST 07/2021- BMW 4 Lowering Springs - 30mm/30mm

Name: AST 07/2021- BMW 4 Lowering Springs - 30mm/30mm
Brand: AST
SKU: ast-ast-07-2021-bmw-4-lowering-springs-30mm-30mm-t14-707589
Price: 381.50 USD
Availability: BackOrder

$381.50

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

AST 07/2021- BMW 4 Lowering Springs - 30mm/30mm. Lowers your vehicle's center of gravity while keeping a comfortable ride.

Key Features

Fits BMW 4 Series models from 07/2021 onwards.
Lowers the vehicle's center of gravity by 30mm front and 30mm rear.
Cold-coiled on Wafios coiling machines for consistent spring rates.
Progressive spring design balances ride comfort with improved performance.
Direct replacement for OEM springs.
Backed by a lifetime warranty against breaking.

These lowering springs are designed for BMW 4 Series models manufactured from July 2021 onwards. Please verify fitment for your specific vehicle.

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About this part

Product Details

These AST lowering springs are cold-coiled on Wafios machines, a detail that matters for consistent spring rates and durability. They're designed as a direct replacement for your BMW 4 Series' original springs, specifically developed for your vehicle's application starting from the 07/2021 model year. The goal here is to lower your car's center of gravity, which can lead to improved handling and a sportier stance, all while aiming to retain a comfortable ride quality similar to what you're used to from the factory.

The progressive design of these springs is key to balancing a lower ride height with enhanced performance. This means they get stiffer as they compress, helping to manage body roll during cornering without making the ride overly harsh for daily driving. AST has a wide range of applications, and these springs are built from well-chosen materials to ensure they hold up over time. They come with a lifetime warranty against breaking, giving you confidence in their longevity.