An object of the present invention is to provide both driving performance on icy road surfaces in a low air pressure state and driving performance on icy road surfaces in a normal air pressure state in a compatible manner. A run-flat tire including a reinforcing rubber layer (10a) with a roughly crescent-shaped meridian cross-section disposed in sidewall portions at both sides in a tire width direction. The tread portion (2) is provided formed of a tread rubber that includes a cap tread rubber (CA) and an undertread rubber (UT) disposed on an inner side of the cap tread rubber (CA) in a tire radial direction and having a higher hardness than the cap tread rubber (CA). In a meridian cross-section, a gauge of the undertread rubber (UT) on a shoulder land portion (23S) on an outer side of an outermost main groove (22) located furthest outward in the tire width direction is thicker than a gauge of the undertread rubber (UT) of a center land portion (23C) closest to a tire equatorial plane (CL).
RUNFLAT TIRE
NOTLAUFREIFEN
PNEU AUTOPORTEUR
2023-07-19
Patent
Electronic Resource
English
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |