Bmw mentions it in their catalog and on the website but in very small print. The default 19 inch wheels come with all season tires in 245/45 all the way around and pretty much all the other 19 or 20 inch wheels come with summer performance tires in a 245/35 and 275/30.
The only reason I know this is because I was planning on switching out wheels and tires when I got the car.
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