The BMW F97 X3M and F98 X4M are widely regarded as some of the most capable mid-size performance SUVs BMW has ever produced. With the S58 engine delivering huge power and the chassis engineered for aggressive handling, they offer a driving experience that feels far closer to an M3 or M4 than most vehicles in the SUV segment.
However, one of the most common topics discussed by owners is ride quality. Many drivers quickly notice that the suspension on these cars (particularly pre-LCI models) is extremely firm. On rough UK roads, the standard setup can feel overly harsh, leading many owners to search for ways to improve compliance without sacrificing the sharp handling that makes the X3M and X4M so special.
In this guide, we’ll explain why the suspension feels so firm, the differences between pre-LCI and LCI cars, and the three most effective suspension upgrades to improve ride quality and control.
Why the BMW X3M & X4M Ride So Firm
BMW’s goal with the X3M and X4M was to create an SUV that could deliver genuine M-car performance and handling. It wasn't to make a comfortable family SUV - that's reserved for the standard X3/X4 models and the M40i if you want a bit more power.
To achieve this, BMW fitted the cars with:
- Very stiff spring rates
- Aggressive damper tuning
- Large wheels and low-profile tyres
However, it still has a relatively high centre of gravity compared with saloon models.
The combination results in a chassis that prioritises control and body management, but it also means the ride can feel harsh on uneven surfaces.
Interestingly, many owners report that the F97 X3M and F98 X4M feel even firmer than a G80 M3, largely due to the additional weight of the SUV platform and the suspension calibration required to control it.
Pre-LCI vs LCI Suspension Differences
BMW recognised the feedback from early owners and made some adjustments when the LCI (facelift) models were introduced.
Pre-LCI (2019–2021)
The original suspension setup is widely considered extremely stiff, particularly in Sport and Sport Plus modes. Even in Comfort mode, the car can feel quite unforgiving over broken surfaces.
While the setup delivers excellent body control, many owners find it too harsh for daily road driving.
LCI (2022+)
With the facelift models, BMW revised the suspension calibration to improve road compliance.
The result is a more forgiving ride, particularly in Comfort mode, while still maintaining the sharp handling expected from an M model.
However, even with these changes, the X3M and X4M remain one of the firmest riding SUVs in the segment, which is why suspension upgrades remain extremely popular among owners.
Our Experience: Improving Ride Quality on Our X4M
At R44 Performance, we recently purchased a high-mileage 2019 BMW X4M as part of our continued development and testing on the F97/F98 platform.
One of the first upgrades we carried out was addressing the suspension setup.
We installed:
- AST Height Adjustable Lowering Springs (ALS)
- Full geometry setup and alignment
- A fresh set of tyres
The results were immediately noticeable. The car felt more compliant on the road, less abrupt over bumps, and significantly more composed through corners. The suspension became more controlled without losing the sharp, responsive feel that makes the X3M and X4M so enjoyable to drive.
This upgrade confirmed something we often explain to customers: improving ride quality doesn’t always mean making the car softer - it means making the suspension work more effectively.
Suspension Upgrade Options for the BMW X3M & X4M
There are three main suspension upgrade paths for the F97 X3M and F98 X4M, each offering different benefits depending on your goals and budget.
Lowering Springs
Lowering springs are the most popular entry-level suspension upgrade for the X3M and X4M.
Brands such as H&R and Eibach offer springs designed specifically for the platform.
While it might seem counterintuitive, many aftermarket springs actually improve ride quality.
This is because the factory springs are extremely stiff to control the high centre of gravity. By lowering the car slightly, the centre of gravity is reduced, allowing the suspension to achieve the same level of control with a more balanced spring rate.
Benefits
- Improved ride comfort
- Reduced body roll
- Lower centre of gravity
- Improved stance
- Compatible with OEM electronic dampers (EDC)
For many owners, this simple upgrade provides a noticeable improvement in everyday driving.
Height Adjustable Lowering Springs
Height adjustable spring kits take the concept of lowering springs a step further.
These kits allow you to fine-tune ride height, giving owners greater control over the car’s setup and appearance.
One of the most popular options is the AST Height Adjustable Lowering Spring (ALS) kit, which we installed on our own X4M.
Benefits
- Adjustable ride height
- Improved ride compliance
- Better handling balance
- Retains OEM electronic dampers (EDC)
- More flexibility than fixed lowering springs
For owners who want a balanced upgrade that improves both comfort and handling, this is often the sweet spot.
Coilover Suspension Kits
For those looking for the ultimate suspension upgrade, coilovers provide the most complete solution.
A system such as the KW V3 coilover kit replaces the factory dampers entirely with higher-quality adjustable units.
Unlike spring upgrades, coilovers allow for precise adjustment of damping characteristics, which dramatically improves how the suspension reacts to bumps and weight transfer.
The result is a chassis that feels far more controlled and composed, with less bouncing or fidgeting over uneven surfaces.
Benefits
- Maximum adjustability
- Superior damper quality
- Improved ride control
- Enhanced handling performance
- Fully adjustable ride height
While coilovers are the most expensive option, they also deliver the greatest improvement in both ride quality and driving dynamics.
The Importance of Alignment and Tyres
Suspension upgrades alone don’t tell the full story.
Whenever suspension components are installed, it’s essential to perform a proper geometry setup and alignment.
Correct alignment ensures:
- Even tyre wear
- Optimal handling balance
- Maximum stability under braking and cornering
Tyres also play a major role in ride quality. Fresh, high-quality tyres with the correct sidewall construction can significantly improve how the car absorbs road imperfections.
Which Suspension Upgrade Is Right for You?
Choosing the right suspension upgrade for your X3M or X4M depends on how you use the car.
Daily Road Driving
Lowering springs or height adjustable springs offer the best balance of comfort, handling, and cost.
Mixed Road & Performance Driving
Height adjustable springs paired with a good alignment setup can transform the car’s behaviour while retaining OEM electronics.
Maximum Performance
Coilovers such as KW V3 provide the most refined and adjustable setup for drivers who want the best possible chassis control.
Upgrade Your BMW X3M or X4M Suspension with R44 Performance
At R44 Performance, we specialise in BMW performance upgrades for the F97 X3M and F98 X4M, including suspension solutions designed to improve both ride quality and handling.
Whether you're looking for lowering springs, adjustable spring kits, or full coilover systems, our team can help you choose the right setup for your car.
We also offer professional installation and geometry setup at our London HQ, ensuring your suspension upgrade delivers the results you expect.
Explore Our X3M & X4M Suspension Upgrades
- BMW X3M / X4M lowering springs
- AST height adjustable spring kits
- KW V3 coilover suspension systems
Speak to a BMW Suspension Specialist
If you’re unsure which suspension setup is right for your X3M or X4M, our team is always happy to help.
Get in touch with R44 Performance for expert advice, supply, or installation and transform the way your BMW drives.
