now auto Mercedes 221 "sparks" Pirelli P Zero: front 245/45/R19, rear 275/40/R19. there used to be a bmw 745 (e65) with the same tires . a lot has been written about rutting . dear gentlemen, you need to properly do the wheel alignment / camber on the car . when you do not put the standard tires, but you do the wheel alignment / camber according to the standard parameters - the car will look for a track even where there is none :- ))