Great advice. I have always run winter tires and rims one size down on my BMW's, xDrive or not. Simplest solution is to speak to someone at Tirerack on the phone. They have never steered me wrong.
Be careful with the M235, since the wheels need to clear the brakes, which means you will have very few options. My current set are Titano and they are fine.
Downside: a bit noisier and reduced handling.
If you own the car and you sell it privately, the winter set-up is a plus for the buyer.
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