And dont forget to get the right rating too. It used to be speed rating, now its more of a load rating S,T,H,V,Y,Z, W Staring with S as the lowest ascending to W, You can go up in rating but never down. In other words, put a V rated tire where H is required. All tire size and ratings, along with recommended pressure is inside the drivers door post on any car or truck built after around 1990 or so.
You think the tire business is easy, huh? I have to explain this several times a week, when someone tells me they can get a $39.00 tire for thier BMW!