they are 16" and there isnt much of a selection when it comes to tires, because of this some people are upgrading to 205 55 16s in the touring size of 195 55 16 you will probably only find 5 or so brands of tires, 3 or 4 brands of winter tires, and 13 or so brands of run flat tires. i have not heard of anyone putting anything else on a touring except those two tire sizes