Depends on which ones you're talking about. My 18" track set were 9.5" front and 10" rear with 275/35/18 front and 285/35/18 rear. I ran those because of a race class I ran in when I bought the wheels that limited me to 285 max tires. I have also had a set of 19" Forgestars and 20" as well over the years. Don't remember the specs on those though.
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