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Running the RT615s daily and at the autocross. I've run the RT615s in the past as well, and have chose to run them over any other street tire due to their price and outright grip. They can't be beat, and Grassroots Motorsports has proven this time and time again.
I should say that this weekend, I will be running V710s in front only, and the RT615s in the back. I just don't believe that adding more grip in the rear will help right now.
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