1997 Chevrolet Silverado 1500 Tires Problems

I PURCHASED FOUR GOODYEAR TIRES @ SEARS IN 2009..EVER SINCE I PURCHASED THESE TIRES MY TRUCK HAS HAD A BOUNCE BETWEEN 35-40 MPH.....I ALSO HAD THE FRONT END ALIGNED ON THE SAME DAY.....I NOTICED THAT THERE ARE BUMPS THAT STICK OUT ON THE SIDEWALLS AND COMPLAINED ABOUT THIS BUT WAS TOLD THAT WAS NORMAL WHEN THE TIRES ARE MANUFACTURED....I HAVE LOOKED AT SOME OTHER TIRES AND DO NOT NOTICE THESE TYPES OF DEFECT ON THESE... I HAVE TAKEN MY VEHICLE BACK AT LEAST FOUR TIMES TO HAVE THE BALANCE CHECKED BUT STILL THE SAME PROBLEM....AND THE PROBLEM IS NOT ADDRESSED...I CANNOT HELP BUT THINK THAT THESE BUMPS ON THE SIDEWALL ARE CAUSING THE BOUNCING...AT THE MOMENT THESE TIRES HAVE ABOUT 8,000 MILES ON THEM. *TR

TIRE BLEW OUT AT NORMAL OPERATING SPEED WITH NO LOAD IN VEHICLE. TIRE FAILURE INVOLVED COMPLETE SEPARATION OF TREAD AND SIDEWALL. VEHICLE HAS BEEN USED AS A PASSENGER VEHICLE AND NEVER HAS BEEN LOADED AS A WORK TRUCK. IN VIEW OF RECENT FIRESTONE PROBLEMS, I THOUGHT THIS INFO MIGHT BE USEFUL. *AK (DOT NUMBER: NA TIRESIZE: LT24575R16)

PE00040, ORIGINAL EQUIPMENTON 1997 CHEVROLET, 1500, TIRE SIZE LT24575R16. PASSENGER'S REAR TIRE HAD A BLOWOUT WITH ONLY 5,000 MILES ON IT. SEEMED THAT THE TIRE EXPLODED INTO PIECES. ALSO, ON OCTOBER 9, 2000 FRONT PASSENGER'S TIRE HAD A BULGE IN THE TIRE WHICH MAY INDICATE A PROBLEM WITHIN THE TIRE. *AK THE TIRES WERE MADE IN CANADA. THE BLOW OUT OCCURED ON HIGHWAY AT 55 MPH. *YH

TIRES WERE REPLACED DO TO CRACKING AROUND THE CIRCUMFERENCE OF THE TIRE. THEY WERE PRORATED AT 60%. THIS SOUNDS LIKE THE SAME PROBLEM FIRESTONE IS HAVING WITH OTHER TIRES.*AK (TIRESIZE: 245R7516)( DOT NUMBER: TIRE SIZE: 245R7516 )