I WAS TRAVELING ON I-70 EAST 25 MILES EAST OF DENVER AT MILE MARKER 133, WITH THREE OF MY GRANDDAUGHTERS IN THE CAR WITH ME. I HEARD A NOISE AND IMMEDIATELY STARTED TO PULL TO THE RIGHT SHOULDER AND BRAKE WHEN THE CAR WENT OUT OF CONTROL, SPINNING ME OUT TO THE LEFT ACROSS BOTH TRAFFIC LANES, TOOK ME IN A 360 DEGREE CIRCLE AND THEN INTO THE DITCH ON THE RIGHT SIDE OF THE ROAD. IT WAS ONLY AN INSTANT FROM FIRST NOISE TO BEING SPUN OUT OF CONTROL - NO WARNING. BECAUSE I WAS SPUN OUT TO THE LEFT, I WAS NOT HIT BY THE SEMI DIRECTLY BEHIND ME. THE RIGHT REAR TIRE RAN AHEAD OF MY CAR FROM THE POINT WHERE I FIRST ATTEMPTED TO STOP. THERE WAS AN INCIDENT REPORT: COLORADO STATE PATROL #[XXX]. OFFICER ON SCENE EXAMINED TIRE AND SAID IT WAS AN "INSTANTANEOUS SEPARATION" OF TREAD FROM SIDEWALL AND POSSIBLY FAULTY TIRE MANUFACTURE. HE ALSO SAID WE SHOULD HAVE ROLLED BUT MY CAR'S LOW CENTER OF GRAVITY SAVED US. WE WERE UNHURT BUT TRAUMATIZED. THE TIRE WAS PURCHASED 1-30-14, 3-1/2 MONTHS PRIOR TO INCIDENT AND WAS IN LIKE-NEW CONDITION. PURCHASED FROM DISCOUNT TIRES ON LAKE MEAD IN LAS VEGAS, MANUFACTURED BY GT RADIAL, GITI TIRE (USA) LTD., 10404 SIXTH STREET, RANCHO CUCAMONGA, CA 91730-5831, PHONE (909) 980-0968. CAR HAD BEEN COMPLETELY GONE OVER TWO DAYS BEFORE WHEN I DEPARTED ON TRIP, TIRE PRESSURE WAS CHECKED THE DAY BEFORE, AND A VISUAL CHECK WAS DONE BEFORE I GOT ON THE ROAD THAT DAY. THERE WAS NO INDICATION THAT THE TIRE WAS DAMAGED OR UNDERINFLATED IN ANY WAY. I BELI