H&R

H&R Lowering Spring Kit - BMW G23 4 Series Convertible

£338.18

Including Taxes

Lead Time - 3 to 14 days

Suspension Secrets Approved

Free Worldwide Shipping

Technical Support Available

Improve the stance and handling of your BMW G23 4 Series Convertible with this vehicle-specific H&R lowering spring kit, designed to work with the original dampers while retaining everyday road usability.

How to choose the correct kit

Choose by drivetrain and engine model.

Do not select by chassis code or engine badge alone. Check every requirement in the table before ordering.

Vehicle fitment

Part number	Fits	Key requirement	Approx. lowering	Production
28662-2	420i, 420d and 430i Convertible	2WD; includes mild hybrid, M Sport suspension and Adaptive Drive	35 mm front / 30 mm rear	2020 onwards
28662-6	M440i xDrive Convertible	xDrive / 4WD; includes mild hybrid, M Sport suspension and Adaptive Drive	40 mm front / 25 mm rear	2020 onwards

Key features

Vehicle-specific spring rates for the listed application
Designed to work with the original shock absorbers
Manufactured in Germany from high-strength spring steel
Zinc-phosphated and powder-coated for corrosion protection
Sportier stance with more controlled handling

Fitment note: Confirm the exact model, drivetrain, production date, suspension specification and axle load where stated. If unsure, contact us with the registration number and a photograph of the vehicle identification plate. Professional installation and a wheel alignment are recommended.

Geometry Explained

Geometry
Suspension geometry is the positioning and angular movement of the suspension arms and the effect that they have upon the movement of the wheel and tyre. It is caused by the different components of the suspension system all moving in their designed paths, which together generate changes in direction and multiple forces on the wheel and tyre, making the steering and suspension operate in particular ways.

Delivery and returns

All parts purchased on our website are shipped internationally free of charge. We accept return requests made within 14 days of receipt of the item.

Need help with something?
Email: sales@suspensionsecrets.co.uk

What our customers say.

Real feedback from customers who have transformed the handling of their cars with Suspension Secrets upgrades.

G87 M2 Handling transformation

Supplied and fitted by the team at Suspension Secrets along side their solid front control arm bushes and Eibach Pro springs. I cant recommend this enough, stability and grip are ...

Supplied and fitted by the team at Suspension Secrets along side their solid front control arm bushes and Eibach Pro springs. I cant recommend this enough, stability and grip are on another level. A* service provided by the team from start to finish. Highly recommended!

- A.J.S

Effortless & Accurate

The results have exceeded my expectations, I'm really pleased with the car. The ride is similar to stock but it's taken the jitteryness away over small ripples in the road. ...

The results have exceeded my expectations, I'm really pleased with the car. The ride is similar to stock but it's taken the jitteryness away over small ripples in the road. I was slightly apprehensive that the stock dampers might be exposed but I needn't have worried, the car rides exactly as I'd expect & want from a roadgoing M-car. The real revelation is the steering, I could feel the difference as soon as I turned out of your premises. Gone is the sluggish, heavy response - it's now quick, effortless & accurate, almost as if the power steering had been switched off beforehand. The car feels like it's 200kg lighter but at the same time, more solid & composed. For me, it's a perfectly-judged road setup - thanks again

- Glenn C.

Transformational

Recently bought a 2025 M3 LCI which seemed ok out of the box. In the wet there was quite bad understeer and slightly unpredictable transition into oversteer. The CS+ handling ...

Recently bought a 2025 M3 LCI which seemed ok out of the box. In the wet there was quite bad understeer and slightly unpredictable transition into oversteer. The CS+ handling package transformed the car. The grip is ridiculous, feel is improved, can really lean on the car. Driving in the wet traction is like it’s dry, extremely stable. Car is predictable, any transition to understeer or oversteer is communicated and feels like slow motion with plenty of time to correct. Feel like all the handling of a CS car with all the comfort or a regular M car. Absolutely love the car now.

- Yaqub A.