AST Suspension Adjustable Lowering Springs – BMW M240i / M340i / M440i xDrive (G42 / G20 / G22, B58)

OVERVIEW

AST adjustable lowering springs for the G-chassis M240i, M340i and M440i (B58, xDrive) let you dial in ride height — roughly 5–35mm front and 5–40mm rear — while retaining the factory dampers.

SPECS

• Ride-height-adjustable lowering springs
• Approx. 5–35mm front / 5–40mm rear adjustment
• Works with the factory dampers
• xDrive fitment

PARTS INCLUDED

• Front and rear adjustable lowering springs and perches

TECH RESOURCES

Additional Parts Required

• Four-wheel alignment — mandatory. Lowering the car changes camber and toe. Book the alignment for immediately after installation.
• Coil spring compressor. Required to disassemble the factory strut assemblies safely — installer-supplied.
• No damper change required. The springs install with the factory dampers.

Installation

• AST Install & Setup guide (ast-suspension.com) — the manufacturer's general installation and setup notes, including kit verification, clearance checks and handling warnings.
• AST Torque Specifications (ast-suspension.com) — manufacturer torque values and thread preparation guidance.
• AST does not publish a vehicle-specific printed installation manual for this spring kit; installation follows the factory BMW spring replacement procedure.
• Request an Install Appointment

Notes

• Fits xDrive models only — not compatible with the G21 Touring or G23 convertible chassis.

PART NUMBER

• ASTALS-21-003

VEHICLE APPLICATIONS