WHILE DRIVING STRAIGHT FORWARD,AT 70 MPH, ON THE FREEWAY, THE VEHICLE PULLED HARD TO THE RIGHT. I COUNTER STEERED AND THE VEHICLE WENT TO THE LEFT, SO I COUNTER STEERED AGAIN. THEN, THE VEHICLE WENT INTO A SPIN AND ENDED UP ON THE CENTER DIVIDER. WHEN I CHECKED THE VEHICLE AFTERWARDS, THE RIGHT REAR TIRE, RIM, BRAKE DRUM AND BEARING WERE GONE. THEY WERE NOT NEAR THE VEHICLE AT ALL AND THE SPINDLE WAS CLEANLY BROKEN IN HALF.