Thank you sir i just found and ordered these NokianT430293. Tire Detail, 245/60R18 109T $575 shipped Autoplicity. Good rating for a non studded snow -Still made in Finland.That's a very good question - and one which could impact performance considerably.
I could not find details in either the descriptions of their videos so far, nor the Q/As that followed.
Those are factory wheels, so I am going to guess either factory sizing or a 235/55.