Patent ID: 7472734

Claim:
A tire/wheel assembly comprising: a wheel having a disc and a rim provided on an outer peripheral edge of the disc in such a manner that a widthwise center of the rim is offset towards one side and the rim undergoes greater deflections on its offset side than on its opposite side during run-flat operation, a pneumatic tire mounted on the rim, the pneumatic tire having a cavity; and a run-flat support member disposed in the cavity of the pneumatic tire, the run-flat support member having an annular shell and elastic rings, the annular shell comprising a support surface located radially outwardly thereof and two leg portions formed radially inwardly thereof in a straddling state, the support surface having a plurality of convexly curved surface sections that are widthwisely arranged, the elastic rings supporting the leg portions on the rim, wherein one of the elastic rings located on the opposite side of the rim to the offset side is smaller in rigidity than the other of the elastic rings located on the offset side, wherein the plurality of convexly curved surface sections of the support surface of the annular shell are equal in radius of curvature, wherein further the elastic rings satisfy the following expression: 0.0012≦( G 2 −G 1)/( G 1× L )≦0.020 where G 1 is the rigidity of the elastic ring on the opposite side, G 2 is the rigidity of the elastic ring on the offset side, and L is the offset amount of the rim.