Patent ID: 9193216
Filing Date: 2015-11-24
Classification: B60C

Abstract:
1. A pneumatic tire comprising a center rib extending along a tire circumferential direction in a center portion of a tread surface, wherein a width of said center rib is equal to or more than 10% of a grounding width, an outside rubber having a relatively high tension modulus is arranged to an outside of a vehicle and an inside rubber having a relatively low tension modulus is arranged to an inside of the vehicle, by setting one and only one interface formed in said center rib along a tire diametrical direction to a boundary, wherein said center rib is divided into two parts in a tire width direction, by setting the single interface to a division surface, wherein at least an outer peripheral portion of the outside rubber on one side of the interface in a tire width direction of said center rib has the relatively high tension modulus and at least an outer peripheral portion of the inside rubber on the other side of the interface in the tire width direction of said center rib has the relatively low tension modulus, wherein at an inner diametrical end of the interface, the interface then extends in a tire axial direction so that an approximately constant thickness of said outside rubber extends axially underneath, and is integrated with an inner peripheral side portion of, said inside rubber, to a position axially beyond the center rib, and wherein 300% tension modulus Mo and a rubber hardness Ho of said outside rubber, and 300% tension modulus Mi and a rubber hardness Hi of said inside rubber satisfy the following relationships: