PNEUMATIC RADIAL TIRE FOR PASSENGER VEHICLE

A pneumatic radial tire for passenger vehicles that satisfies a defined relationship between sectional width SW and outer diameter OD of the tire, and includes only one circumferential main groove extending in a tire circumferential direction on a tread contact surface, the circumferential main groove being provided to a half portion of the tire on a vehicle-mounted outward side, which is one side of the tire in a tread width direction with a tire equatorial plane as a boundary. A drop height (or ground contact length relationship, or tread gauge relationship) is also defined.