Yep, my mistake. I just checked myself to see if I was wrong anyways :P I was under the assumption that the street cars could not get lettering on the tires :P
So answer the man... how the hell do you use these?
EDIT- OIC, you can only use one at a time? Errr.. you cannot keep adding them so eventually you have 50 sidewalls to use... why didn't they make it so you could do that? Seems like it would be easy enough. Sometimes the devs are so close-minded about things like this... :-/