Run-flat device

A run-flat device for fitting on the outer circumferences of a wheel inside an inflatable tyre, said device comprising an annular ring made up of a plurality of arcuate segments having a flange at each end that overlaps circumferentially the corresponding flanges of adjacent segments, which flanges are interconnected by clamping means equally spaced around the ring that imparts to each segment a circumferential clamping force and an axial clamping force to urge the segments circumferentially and axially towards each other wherein the clamping means comprises a first and second clamping bolts which pass through a pair of spaced holes formed in the adjacent flanges, said device additional comprising a retaining plate having two captive nuts mounted thereon, for securing the first and second clamping bolts and to prevent lateral twisting of the flanges.