A vehicle tire mounted on a rim, a synthetic plastic hose disposed in a well around the tire rim, said synthetic hose containing a sealing preparation of natural rubber latex and at least one synthetic latex selected from the group consisting of isoprene rubbers, acrylate rubbers and methacrylate rubbers, a tool for opening the synthetic hose and a pressure sensor, said tool and said pressure sensor being operatively associated with said synthetic plastic hose whereby the occurrence of a specific pressure drop in the vehicle tire sensed by the pressure sensor triggers an electronic or mechanical pulse which actuates the tool to open the synthetic plastic hose for the distribution of the sealing preparation into the tire.