A wheel and tire assembly for a mobile vehicle is disclosed. The assembly (140) comprises an inner central rim (141); an outer flexible ring (142) mounted to the inner central rim (141); and a spoke structure (110) extending radially between the central rim (141) and the flexible ring (142). The spoke structure (110) defines a plurality of cavities (111) and an alternating plurality of radially extending openings disposed concentrically about the inner central rim (141) and allows the flexible ring (142) to deflect under load.