I had a 2023 MX for a couple of months with the 22" wheels that was bought back for a completely separate issue. It was replaced with a 2023 MXP with 20".
With the previous one and the 22" wheels the ride was always rough. I did road force balancing, alignment, lowered tire pressure to around 38-39 cold (from the recommended 42) but, even though it would do great over larger road imperfections, even railroad tracks, the ride would suffer from tiny imperfections on the road that seem to unsettle the chassis, even on newly paved roads would translate to subtle back seat vibration. It would resonate every few second, giving you a tingly feel at your back after driving in town at speeds up to 50 for 30-40 minutes, that lasts a while.
I would have thought the new MXP with the 20" would be better but it is pretty much the same. Took it for road force balancing again and lowered tire pressure to 40 (from recommended 45). I still feel this subtle vibration on the seat no matter what the pavement feels like. It is pretty much the same no matter the suspension settings and ride height.
So I thought, coming from BMW M cars, it is just that these weigh a lot, so this is how it must be. Keep in mind I have never felt anything like this with any of the BMW Ms which drove fantastic on very low profile tires and obviously sport tuned suspensions.
Well, over the weekend we got a new Mercedes EQS SUV also with air suspension and 21" wheels. This thing is SO smooth it is crazy. Over the same roads where the MXP feels like it wants to massage me with seat vibrations produced over the smallest road imperfection, the EQS feels incredibly smooth, just like the BMWs.
Am I the only one who feels that the suspension of the MX is severely lacking in refinement and needs much more development even though it is an air suspension? Has anybody done anything to improve this? I understand people may say it is not a luxury car, but even a Model 3 loaner I had with 20" seemed to not have this exact issue, but of course it was lacking as far as bigger road imperfections go.