Our tires are Continental Pro Contact RX T1s. The fronts are 255/45 R19 104W M.S. The rears are 285/40 R19 107W M.S. They are rated at Treadwear 400, Traction A and Temperature A. I don't know enough to criticize one manufacturer over another but these ratings sound pretty good to me. I can only hope that Continental is a high quality manufacturer.
I guess I am just pretty frustrated about how difficult it is to get straight, honest, complete answers to questions like these from Tesla. And believe me, I have tried. Sometimes I feel like I am asking too much or my questions are considered inappropriate. As an example I have been trying, for at least 6 months, to get torque figures for our S Long Range. No one seems to know. I was more surprised when I posted on this site regarding the same issue and after more than 150 views not one person had anything to say in response. I had the feeling that people purchasing a car like the S would be car guys (or gals) and would clearly have an interest in the torque generated by these rather fast cars. After all torque, in conjunction with horsepower, is primarily what makes a car go fast faster!
I would hope that Tesla would assume responsibility for keeping their publications accurate. I am not excited about constantly having to take such information with questions in my mind about accuracy. Some might say I'm just too curious or demanding.