SKU: ASTLS-21-041
AST 03/2014-07/2021 BMW 4 Lowering Springs – 40mm/40mm
AST Lowering Springs lower the center of gravity on 2014-2021 BMW 4 Series Coupe (F32), Convertible (F33), and Gran Coupe (F36) models by 40mm front and rear. These direct OEM replacements use progressive spring rates to maintain ride comfort while improving handling and stance. Crafted on Wafios machines from high-strength steel for precise vehicle-specific fitment.
Key Features
- 40mm Front/Rear Drop: Lowers ride height evenly for aggressive stance and better aerodynamics without sacrificing daily drivability
- Progressive Spring Design: Varies rates for smooth compliance over bumps and firm control in corners, preserving OEM comfort levels
- Premium Wafios-Coiled Steel: High-tensile materials ensure durability and consistent performance under high loads
- Direct OEM Bolt-On: Vehicle-specific engineering allows drop-in installation with no modifications to suspension geometry
- Lifetime Warranty: Guaranteed against breakage for long-term reliability on the road or track
Product Notes
- Pair of front and rear springs included for complete installation
- Inspect alignment after install to ensure optimal tire wear
- Special order item with lead time of 3-5 business days
Installation Notes
- Professional installation recommended.
- Raise vehicle securely and support on stands before removing OEM springs
- Compatible with factory dampers and control arms, no additional hardware required
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2016 | BMW | 428i Gran Coupe | Base |
| 2017-2020 | BMW | 430i Gran Coupe | Base |
| 2014-2020 | BMW | 4 Series Coupe | 420i/428i/430i/435i/M4 |
| 2014-2021 | BMW | 4 Series Convertible | 428i/430i/435i |
| 2014-2021 | BMW | 4 Series Gran Coupe | 428i/430i |
Why Choose AST?
- Proven across 3000+ vehicle models from 1966 to 2023 for broad compatibility
- Advanced manufacturing delivers exact tolerances for BMW chassis dynamics
- Lifetime structural warranty backs every set for worry-free driving
Frequently Asked Questions
- Q: Will these fit my 2015 BMW 428i Gran Coupe?
A: Yes, ASTLS-21-041 fits 2015-2016 BMW 428i Gran Coupe Base models precisely as a direct OEM spring replacement - Q: What material are the springs made from?
A: High-strength chrome-silicon steel coiled on Wafios CNC machines for superior fatigue resistance and longevity - Q: What does the lifetime warranty cover?
A: Full coverage against spring breakage under normal use, with no time limit for manufacturer defects
Shipping & Handling
- Method: UPS Ground or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Securely boxed pair, 20 x 7 x 7 inches
- Weight: 12.5 lbs
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