Race tire size question
 

Ok so I'm out here at heartland park and hoosier is out here providing tires for the porsche track day. I walk over and see some of the take offs have a little life left in them. So I ask the guy how much for some take offs. He tells me if I find a set I like to just take them. So I'm looking to take some home and realize that I'm not sure what size I should be looking for. I'm thinking 18's maybe 275/45? I have seen people running saleen replica wheels on our cars, however I'm not exactly sure what size those are. Does:tiphat: anyone have an idea of what size tires u could fit over these, or any other similarly sized wheel?