Sandy,
That is what I have noted too. Yes, you can get 15 inch tires to work, but the choices are limited, and if you were in a pinch, you could get stuck. I have thought about a set of 15's for the road, and a separate set of 17's for the track. Of course, my track time is just open track days, no racing; and I am happy on good street tires, maybe R-compounds. I don't have enough skill for slicks yet.
Just wanted to make sure I wasn't missing anything.
Oh, and if you run street tires on the track, it makes it alot harder to overheat the brakes
