Sealing and inflating system incorporated with a vehicular wheel including a tire rim and a tire mounted to the tire rim including a source of sealing and inflating compound arranged in connection with the tire or tire rim, a detecting mechanism for detecting a rupture in the tire, and a release mechanism coupled to the source and the detecting mechanism for releasing a quantity of the sealing and inflating compound from the source when the detecting mechanism detects a rupture in the tire. The source, detecting mechanism and release mechanism can all be arranged in the pressurized interior space defined by the tire and the tire rim. In this case, the source can be attached to the tire rim. One such construction of the source has two substantially semi-circular parts arranged around the tire rim and connected together, with a release mechanism being arranged in engagement with each part.
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