Since I have 20 inchers on my vehicle now, it's not that...

Snow and slush can hide some awful surprises (potholes etc) and it is easy to do terminal damage to a 20 inch rim. In any event you want a narrower tire in the snow for traction and stability together with the larger rubber section height to protect from sliding into curbs and stuff.

John

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2006 Black X5 4.8is