SKU: ASTLS-22-122
AST 07/2020+ BMW 4 Series Lowering Springs – 40mm/40mm
AST lowering springs drop your 2021+ BMW 4 Series Coupe Convertible and Gran Coupe 40mm front and rear as a direct OEM replacement. They lower the center of gravity for sharper handling while keeping the OEM comfort level you expect. Vehicle-specific progressive design enhances cornering and stability on daily drives or track days.
Key Features
- 40mm Front/Rear Drop: Reduces center of gravity by 40mm on both axles for improved balance and reduced body roll during aggressive cornering.
- Progressive Spring Rate: Provides linear response that maintains ride quality over bumps yet firms up under load for confident performance driving.
- Premium Materials: High-strength steel coiled on Wafios machines ensures durability and consistent performance across thousands of cycles.
- Vehicle-Specific Engineering: Custom-developed for BMW 4 Series G23/G24/G26 models from 07/2020 ensuring perfect fit and OEM-like alignment.
- Lifetime Warranty: Guaranteed against breakage or sagging for long-term reliability and driver confidence.
Product Notes
- Direct bolt-on replacement uses existing OEM shock absorbers and mounting hardware.
- Pair with stock dampers for street use or upgrade to adjustable coilovers for track setups.
- Ships as a complete front and rear spring set ready for installation.
Installation Notes
- Professional installation recommended.
- Reuse OEM upper perches top hats and insulators no additional hardware required.
- Check wheel/tire clearance after install may require camber adjustment for optimal tire wear.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2021-2025 | BMW | 4 Series | 430i Coupe (G24) |
| 2021-2025 | BMW | 4 Series | M440i xDrive Coupe (G24) |
| 2021-2025 | BMW | 4 Series | 430i Convertible (G23) |
| 2021-2025 | BMW | 4 Series | M440i xDrive Convertible (G23) |
| 2021-2025 | BMW | 4 Series | 430i Gran Coupe (G26) |
| 2021-2025 | BMW | 4 Series | M440i xDrive Gran Coupe (G26) |
Why Choose AST?
- Proven track record in motorsport suspension for BMW enthusiasts worldwide.
- Hand-built quality with precision tolerances for repeatable performance.
- Extensive testing on over 3000 vehicle models since 1966 ensures reliable fitment.
Frequently Asked Questions
- Q: Will these fit my 2022 BMW M440i xDrive Coupe?
A: Yes fits all 2021-2025 BMW 4 Series G24 Coupe models including 430i and M440i xDrive from 07/2020 production direct OEM replacement. - Q: What material are the springs made from?
A: High-tensile chrome-silicon steel coiled on advanced Wafios machines for superior fatigue resistance and longevity. - Q: Does the lifetime warranty cover sagging?
A: Yes lifetime warranty protects against manufacturing defects including breakage and sagging under normal use.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Securely boxed set 22 x 8 x 8 inches
- Weight: 24 lbs
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