I know a 19x9 with ET29 fits perfect with 275/30-19. ET (offset) is how much it sticks in or out. If a wheel is taller, it usually has to have a smaller offset (this will push it out), to mitigate rubbing on the inside, BUT you also have to contend with the outside rubbing. Tire size helps this. But can also give you a crappy ride if you have to go to such a low profile to avoid rubbing. Spend some time on Tirerack's site, you will learn all you need to know. There are also plenty of threads where people say what they are running. Most are extreme and have had to roll the fenders. I was not willing to do this.