All this discussion about the RT615 proves why it is the tire that all newcomers are measured against.
The price to performance ratio is just derned hard to beat.
It's part of the reason I plan to start next season with a new set of RT615's, and use them mainly for competitive driving, and keep good summer or all season tires on the other wheels for daily use. The minor amount of intial grip I'll give up, will be well worth it down the road, when they still work nearly as well bald, as they did new.
I'm hoping my current set (at the treadwear bars) will last the rest of this season. I got this set free, so instead of just buying a new set and running them full time, I spent about same money on a second set of wheels to finish off what I have, and still have daily use wheels/tires. They are too worn to be safely used on the street, particularly when the street is wet, but fine for autox/track use except for extremely wet conditions.
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