Patent ID: 7509986

Claim:
A tire wheel assembly where, while a pneumatic tire is fitted to a rim of a wheel, inserted into a cavity portion of the pneumatic tire is a run-flat support member being formed of: a pair of elastic rings fitted to the rim; and an annular shell straddling between the elastic rings, wherein the wheel rim has two outer diameters, one outer diameter measured on a front side of the wheel rim and the other outer diameter measured on a back side of the wheel rim; and said two outer diameters being equal, and wherein inner diameters of the pair of elastic rings are made different from each other to make an inner diameter of one elastic ring fitted to the rim in a back side of the wheel smaller than an inner diameter of the other elastic ring fitted to the rim in a front side of the wheel; wherein a projection continuous in a circumferential direction of the tire wheel assembly is provided on one side of a radially inner end portion of the elastic ring fitted to the rim in the back side of the wheel, the one side being outward in an axial direction of the tire wheel assembly; and wherein a height and a width of the projection are in ranges of 0.4 to 1.5 mm and of 5.0 to 15.0 mm, respectively.