| 摘要 |
PURPOSE:To obtain a pneumatic radial tire for which the operational stability can be improved in both cases of wet road surface and dry road surface. CONSTITUTION:A transverse main groove 14 is so constructed that one end area is terminated at the tread end area 16A on the inside of a vehicle (in the direction of an arrow IN) and opened, and the other end area is terminated at the tread end area 16B on the outside of the vehicle and opened. The width of the groove is gradually decreased toward the outside of the vehicle. The cross main groove 14 is inclined to the tire rotating direction kickout side (the opposite direction to the direction of an arrow D) with respect to the cross direction of the tire (direction of the arrow IN and the opposite direction to the direction of the arrow IN). During the turning driving of the vehicle on the dry road surface, the area on the outside of the vehicle where the width of the transverse main groove 14 is narrow and the grip force is increased is largely grounded so as to improve the operational stability. During the driving on the wet road surface, water is discharged through a circumferential main groove 18, a circumferential auxiliary groove 22 and the transverse main groove 14. As the width of the transverse main groove is gradually increased toward the downstream side of the flow of water (inside of the vehicle), the efficiency of discharged water is good. |
