I was it the dealer for something else and asked if the mechanic could tell the computer the new tire size. It's true that they have to choose from preprogrammed sizes but he did a little math and was able to dial it in. My speedometer was brought right back too. He didn't tell me the tire size he used only that he got it very close. They only charged me thirty five bucks but we have a long history with new cars and service. I called a different dealer who told me fifty dollars to check and see if that size was available and a hundred dollars (total) if they change it. The service advisor said that it's a process and it's time consuming, that's why it costs so much. I don't know about the "process". I was out of there in about an hour and that's including the time for checking the wheel bearing. I think they were in the process of taking my money lol.
