Pretty sure like in GT5 if you have slicks on a wet road your tires don't degradeI used the Bentley Speed 8, started on RS tires (are inters or wets actually useful?) pitted at end of lap 3 (my tires didn't degrade for some bug reason) then put on RS, pitted end of lap 5, more RS and finished on them, more than a minute ahead of 2nd place.