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Cost maters. These tires (and other max performance street) age harden just like a R-comp (well, not as fast). I would rather be able to have two sets of slightly lower performance tires, since once they start to harden, a new slightly lower spec tire will still be better.
I have the RT-615Ks on my 968 and I think I'll be replacing them before they wear out, due to hardening and loss of performance.
Just a thought...
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