For winter having nattower tire helps..within certain limits of course..too narrow and you would sacrifice dry road stability.Narrower tire would mean more bodyweight per square inch of contact patch and therfore helps the tire grip on snow covered and icy roads.
You would also be better of gowing with a taller profile tire..this helps deep snow traction and helps protect against potholes. My winter setup is 225 50 17 and with xdrive..I am unstoppable with whatever Ontario has thrown at me.
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