EE WAS PUTTING AIR IN THE LEFT FRONT TIRE OF THE TRACKMOBLE. UPON COMPLETION EE STARTED TO MOVE AWAY FROM THE TIRE. THE SPLIT RIM FAILED AND SHOT OFF THE UNIT. IT BLEW DIRT AND RUST PARTICLES INTO HIS ARMS, CHEST, STOMACH, AND LEGS. THE RIM HIT HIS LEFT LEG AND HIS KNEE SWELLED UP. RIM WAS RUSTED BUT DID NOT SHOW VISABLE SIGNS OF STRUCTURAL ISSUES.