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AST Adjustable Lowering Springs for BMW X3M/X4M
These AST Suspension adjustable lowering springs let you fine-tune ride height after installation on the BMW X3M (F97) and X4M (F98). Built on Wafios coiling machines in the Netherlands, the progressive spring design lowers the vehicle's center of gravity while retaining the comfort characteristics of the factory suspension.
Key Features
- Ride height adjustable after installation
- Progressive spring rate design
- Direct OEM replacement fit
- Manufactured on Wafios coiling machines in the Netherlands
Fitment
| Year | Make | Model |
|---|---|---|
| 2019 and newer | BMW | X3M |
| 2019 and newer | BMW | X4M |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | ALS-21-015 |
| Adjustability | Ride height adjustable post-install |
| Manufacturing location | Netherlands |
What's Included
- 1 set of AST adjustable lowering springs
About AST Suspension
AST Suspension engineers coilover and spring systems in the Netherlands, using precision Wafios coiling equipment to produce vehicle-specific suspension components that balance a lowered stance with retained ride comfort and handling performance.
FAQ
Can I adjust ride height after these springs are installed?Yes, these springs are designed to allow ride height adjustment after installation.
Will this affect ride comfort compared to stock springs?These springs are designed to retain a comfort profile close to the factory setup while lowering ride height.
Do these fit the standard X3 or X4, not the M version?No, this listing is for the F97 X3M and F98 X4M M-performance models specifically. Confirm your exact model before ordering.
Is professional installation recommended?Yes, spring installation involves suspension disassembly and should be performed by someone experienced with suspension work.
Will I need an alignment after installation?Yes, an alignment is recommended after any ride height change to restore proper suspension geometry.
Do these springs work with the factory shocks?These springs are designed as a direct OEM replacement and are intended to work with the factory damper setup.
Where are these springs manufactured?These springs are manufactured in the Netherlands on Wafios coiling equipment.
How much does ride height change with these springs?Specific lowering amounts should be confirmed against AST's published specifications for this exact part number before ordering.
Installation Instructions
- Raise and safely support the vehicle to access the front and rear suspension.
- Remove the wheels and disconnect the factory spring assembly per the vehicle service manual.
- Install the AST adjustable lowering springs in place of the factory springs, adjusting to the desired ride height.
- Reinstall the suspension assembly, torque all hardware to specification, and reinstall the wheels.
- Have the vehicle aligned before extended driving.
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