A tire locking device installed inside the cover of a tire mounted on a wheel rim and exerting pressure on the beads of the cover, urged against the flanges of the rim, includes a metal strip shaped as a cylindrical ring which is split parallel to its generator lines, is provided on both circumferential edges with extrusions made of an elastomer type material. The extrusions are split level with the split in the metal strip, and a means for connecting the edges of the strip with the intrusions form an annular lock of total width which is greater than the nominal spacing between the inside faces of the beads of the cover in which the device is mounted.