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Small update from this side: Check alignment, was all perfectly fine. Showed the tires, he asked if i could walk with him and showed me at least 3 X3/X5 20 inch runflat sets with exactly the same issue.. nothing we can do about it.. He can change the alignment so it will be less but it then says it's out of BMW spec.
I just go for new tires and will check regularly.
Regarding non approved tires and non runflats:
These cars are adjusted for running on runflats. Mounting non runflats on them will definitely increase the ride comfort but also the characteristics of the car itselfs. It's not designed for this. Drove once with the wrong (non-runflat) tires, turned around and got runflats.
Regarding non-apporved tires: Even michelin expert i've spoken to says: in a staggered setup be wise and stick to the approved pirelli's... Michelin don't have apporved tires.
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