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ive run both in a variety of sizes and they both act about the same.
track grip with the kdw is GREAT. even in the wet. (i lapped a rained out cscs event for hours with the kdws in my silvia with no issues) got a full summer out of them with not much tread wear.. id easily get another season.. and thats with 2 lap days and daily driving
the rt615 is also a fantastic tire with good tread wear, and good wet grip as well (way better than the first gen azenis rt215) ill be running a 255 40 17 on my gtr this year so well see just how long they last..
Greg
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