235/45R17. My two complaints are noise and tramlining. I like the sidewall stiffness and resistance to hydroplaning. Traction is good wet and dry and, so far, wear is good (I guess that I am not down to the softer compound in the Uni-T construction). This is the third season I've had them and I haven't seen any excessive wear (only down 2-3/32nds and I check it when I put them on and take them off). I got dedicated snow tires so I am guessing I have about 18K miles on the ZRis.