Michelin and The Dow Chemical Company (Polyurethane Business) have entered into a joint-development agreement to accelerate the technology associated with the run-flat support rings, internal devices that support a deflated PAX System, Michelin's integrated tire/wheel system. Through the agreement, Dow and Michelin will focus on developing technology and materials to develop a strong, lightweight, cost-effective support ring for the PAX System. Dow brings its knowledge of polyurethane and manufacturing processes to the agreement, while Michelin will provide design and test support.