My RS4 tires have this, all 4 of them, almost all of the contact patch has it except for a tiny wit bit in the middle of it (guess I may be running pressures too low after all). My nittos never turned blue tho, so there is certainly some magic to this "street" tires that makes them stick as much as a "slick" tire (nittos and maxxis, which arent really slicks, no more than street tires are at least).
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