[IanH]

Xdrive isn't full time awd, so why would it have an issue with 2 different diameters? It could just slip the clutch to compensate, and likely does this regularly for all sorts of driving conditions.

The only thing that can really be an unsolvable issue would be the computational elements based on wheel speed, which shouldnt cause xdrive to fail but it may not work to its fullest capabilities.

[mjr24]

Originally Posted by Hiddenknife

I know it might be stupid sounding question, but does your BMW have xDrive, do you run non star marked non runflat tires? For how long and if any issue so far?

BMW star marked tires are mostly "star marked" because they are approved in rolling circumference (same RC all four)but of course there are some other star marked tires that use different rubber compound like Michelin Pilot Sport 4S

I’ve put hundreds of thousands of miles on high end BMWs with zero issue…..ever. Maybe ran OEM tires for 10 percent of that…..yes lots of that were on XDrive models….X5M, X7, M5, M8, M550i.

It’s like how BMW recommends Shell gasoline. Sure, maybe the car runs “optimally” on it….but the gas from other places works just as good.

That being said, I stay within the 1 percent rule. That’s something I wouldn’t want to risk going outside of.