For what it's worth, I had the RT-615s on my last street car. I had around 15k miles on them, which involved drag racing and auto-x, running about -1.0 degrees camber up front and -0.5 out back, and they were just starting to show secondary rubber when I sold the car. Performance wise, I was happy with how grippy they were, but they can get sketchy in the rain if you're not careful.
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- Peter -- 66 Le Mans - 93 LX 5.0 --
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