Christian944 Posted January 19, 2023 Share Posted January 19, 2023 (edited) I am trying to get into TT this year and I purchased some used Pirellis slicks for TT and I need clarification on the tire rule to see if I can stick with these tires or if I need to purchase some Hoosiers. It states the following: "Tires greater than 315 (DOT) and 11.8”/300mm/30cm (non-DOT) will be assessed via the “Adjusted Weight/Power Ratio” in ST2 and ST3 (unless the vehicle competition weight is more than 3750 lbs.)" My competition weight is over 3750 (Camaro SS 1LE), does this mean I can run non-DOT tires without penalty. Or will I have to purchase some 315/30/18 Hoosier R7's to compete? I'm thinking it means that I will not be penalized the extra -.3 for NON-DOT tires larger than 300mm, but I will still be penalized the -.7 for NON-DOT tires. Thanks Edited January 19, 2023 by Christian944 Quote Link to comment Share on other sites More sharing options...
National Staff Greg G. Posted January 19, 2023 National Staff Share Posted January 19, 2023 Tire Type: Non-DOT approved tires (ST1, ST2 Only) = -0.5 Non-DOT approved tires (ST3 Only) = -0.7 Yes, if you are planning on running in TT3, then the non-DOT tires would have a -0.7 Mod Factor Quote Link to comment Share on other sites More sharing options...
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