Servus I need winter tires for my Smax all-wheel in size 235/55/17. So now the question has made me smart at several dealers. To the choice are Conti 850p or Pirelli Sottozero3. Two dealers say Conti loses after half is rubbed off many lamellas of other dealers says that of the Pirelli! Now the question, are these tires after 2winters much worse before you,which one loses some performance is already clear. So in two winters 16-18000km drive greetings ML