PE-00-020; ORIGINAL EQUIPMENT ON A 1999 FORD, RANGER, TIRE SIZE P22570R15, DOT NUMBER NOT AVAILABLE, TIRES HAVE 29 THOUSAND MILES ON THEM. THREE OUT OF FOUR TIRES HAVE DEVELOPED MAJOR CRACKS AROUND THE SIDEWALL AREA WHICH WAS CAUSING VEHICLE TO FISHTAIL DUE TO PORTION OF THE TREAD THAT WAS MISSING FROM THE TIRES. ALSO, STEEL BELTS WERE COMING THROUGH THE TIRES. BOTH FRONTAL TIRES AND THE RIGHT REAR TIRE, RIGHT REAR HAS BEEN REPLACED WITH THE SPARE.*AK