Composite RunFlat (CRF) - a reinforced polymer device designed for one-piece wheels to provide flat tire mobility when used with pneumatic tires. This special composite material reduces friction and heat buildup inside a flat tire. The CRF is easily mounted inside a standard tubeless tire on a traditional "drop center style" wheel using normal tire mounting tools. Each CRF is custom built to meet the specific load rating criteria and distance requirements of the application.