A run flat safety support ring intended to be mounted on a wheel rim inside a tire equipping a vehicle for supporting the tire tread in case of loss of inflation pressure has a generally cylindrical crown intended to come in contact with the interior of the tire tread in the event of the loss of inflation pressure, but has a clearance from the tire tread interior at normal pressure. The ring also has an annular body located radially inward of the crown, the annular body comprising a grid of continuous reinforcement composite.