Patent ID: 7243694

Claim:
A run-flat support ring for mounting inside a tire on a wheel rim, said tire having a tread strip region, said wheel rim having at least one annular depression and one annular raised surface, comprising: a substantially cylindrical member configured for mounting around said wheel rim, said member having a radially outermost surface for contacting said tread strip region of said tire in the event of a loss of air pressure, said member having a radially innermost surface for securing said member to said wheel rim, said radially inner-most surface including i) a plurality of circumferentially placed protuberances configured to engage said depression; ii) a plurality of circumferentially placed tabs configured for engaging said wheel rim proximate to said depression; and iii) a plurality of circumferentially placed ribs, extending longitudinally along the axial direction, and configured for engaging said annular raised surface.