SKU: ASTLS-21-036
AST 07/2013-10/2020 BMW 4 Lowering Springs – 40mm/40mm
AST Lowering Springs deliver a precise 40mm drop front and rear for 07/2013-10/2020 BMW 4 Series F32/F33/F36 models. These direct OEM replacements lower the center of gravity to sharpen handling while retaining familiar ride comfort. Progressive spring rates ensure balanced performance on street or track.
Key Features
- 40mm Front/Rear Drop: Lowers ride height evenly for improved stance aerodynamics and cornering stability
- Progressive Spring Design: Balances firmness for sporty response with compliance for daily driving comfort
- Vehicle-Specific Engineering: Developed exclusively for BMW 4 Series F32/F33/F36 chassis ensures bolt-on fit without modifications
- Premium Materials: High-tensile steel coiled on Wafios machines for durability and consistent performance
- Lifetime Warranty: Guaranteed against breakage for long-term reliability and confidence
Product Notes
- Direct OEM spring replacement requires no additional hardware
- Pair with OEM or aftermarket dampers for best results
- Packaged securely to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Front and rear springs swap directly with OEM units
- Wheel alignment required post-installation for optimal tire wear
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2014-2020 | BMW | 4 Series | 428i F32 Coupe |
| 2014-2020 | BMW | 4 Series | 428i xDrive F32 Coupe |
| 2014-2020 | BMW | 4 Series | 430i F32 Coupe |
| 2014-2020 | BMW | 4 Series | 435i F32 Coupe |
| 2014-2020 | BMW | 4 Series | 435i xDrive F32 Coupe |
| 2014-2020 | BMW | 4 Series | 440i F32 Coupe |
| 2014-2020 | BMW | 4 Series | 428i F33 Convertible |
| 2014-2020 | BMW | 4 Series | 435i F33 Convertible |
| 2015-2020 | BMW | 4 Series | Gran Coupe F36 428i/430i/435i/440i |
Why Choose AST?
- Proven suspension expertise across 3000+ vehicle models since 1966
- Hand-built quality using advanced Wafios coiling technology
- Exact fitment engineering for BMW precision and performance
Frequently Asked Questions
- Q: Will these fit BMW M4 models?
A: Designed for non-M 4 Series F32/F33/F36 only M4 requires separate springs - Q: What spring material is used?
A: High-strength steel alloy for corrosion resistance and fatigue strength - Q: What does the warranty cover?
A: Lifetime protection against manufacturing defects and breakage under normal use
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Sturdy box 20 x 10 x 8 inches
- Weight: 24 lbs
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