AST Lowering Springs For BMW 4 420i/430i/420D 07/2020-, Front 30 , Rear 30

The AST Lowering Springs for BMW 4 Series models 420i, 430i, and 420D (from 07/2020 onwards) represent a high-quality solution engineered to enhance vehicle dynamics by lowering the center of gravity by 30 mm at both the front and rear axles. Manufactured with precision on state-of-the-art Wafios coiling machines, these cold-coiled springs maintain a balance between improved handling and ride comfort, ensuring a driving experience that respects the original comfort levels provided by OEM springs.

Designed specifically for each vehicle model, the AST Lowering Springs are crafted from premium materials that guarantee durability and performance. Their progressive spring rate optimizes suspension behavior, contributing to enhanced cornering stability and reduced body roll without compromising everyday usability. This makes them an ideal upgrade for drivers seeking refined handling characteristics while preserving the comfort expected from a premium vehicle.

With a comprehensive application range covering over 2500 vehicle models since 1966, AST springs are trusted worldwide for their reliability and quality. Each set is backed by a lifetime warranty against breaking, reflecting the brand’s commitment to long-term customer satisfaction and product excellence.

Please note that these lowering springs are not suitable for 4WD (four-wheel drive) vehicles. Additionally, vehicles equipped with M-sport or Adaptive M-sport suspension systems will experience approximately 10 mm less lowering effect.

Lowering Specifications

• Front lowering: 30 mm
• Rear lowering: 30 mm
• Progressive spring design for optimized balance between performance and comfort
• Approximately 10 mm less lowering on vehicles with M-sport or Adaptive M-sport suspension

Compatibility

• BMW 4 Series 420i, 430i, 420D from 07/2020 onward
• Not compatible with 4WD (four-wheel drive) vehicles
• Engineered specifically for each vehicle model to ensure perfect fit and performance
• Suitable for vehicles with standard suspension systems

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We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

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All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.