Never stand in front of a split ring while inflating the tire mounted to it. A damaged split ring can come apart with deadly force. Even when you're just topping off the tire, use an air hose with a clip-on chuck and a remote, in-line valve and air gauge. This allows you to stand aside, out of the trajectory of an explosion while inflating the tire. If you found the tire inflated to 75 percent of its rated inflation pressure or less, remove the wheel from the vehicle, inspect the tire, and re-inflate the tire in a safety cage.