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Since 1971, the scientists at Carefree Tire have been developing a line of technologically advanced polyurethane products and in 1977 developed a high performance flexible polyurethane formulation. By combining this proprietary blend of micro-cellular polyurethane with a novel manufacturing method of centrifugal casting, light-weigh and durable Carefree Tires provides an “air cushioned” ride without adding any significant weight, delivering the assurance and durability of a solid tire with the p …