Use 17's on my '16 535d xdrive and the correct offset is important due to tight clearance between the front caliper and inside of rim. If your goal is to manage deep snow, go with the narrowest wheel tire combination and you'll be amazed at how a 5 series sedan plows through deep snow. The combination is also much cheaper. I live in a lake-effect snow belt and my 535d easily handled over 2 feet of snow in my driveway. Where I live, looking cool in the winter is not an issue, since it doesn't much matter how 17's look on a car covered in road salt and dirt.
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