COOPER ZEON 2XS, COOPER ZEON ZPT, AND MASTERCRAFT AVENGER ZHP, SIZE 215/35R18 MANUFACTURED BETWEEN JANUARY 11 AND JANUARY 31, 2004. THESE TIRES ARE PRONE TO SIDEWALL CRACKING ON BOTH SIDEWALLS OF THE TIRE. IN CERTAIN SERVICE CONDITIONS WHERE EXCESSIVE FLEXING OF THE TIRE SIDEWALL OCCURS THE CRACKING COULD EXTEND TO THE BODY PLY CORDS. THIS CONDITION COULD LEAD TO THE DEGRADATION OF THE BODY PLY CORDS AND LOSS OF INFLATION PRESSURE. THE LOSS OF INFLATION PRESSURE COULD CAUSE THE TIRE TO RUN UNDER-INFLATED AND RESULT IN EARLY TIRE FAILURE.