| 摘要 |
PURPOSE:To provide the maneuvering stability and the comfortableness in a car cabin compatibly by forming siping in ribs in the tread central area, setting the circumferential direction pattern rigidity of the area in a specific range, and also setting the siping width and inclination angle to specified ranges. CONSTITUTION:A pneumatic tire is provided with a plurality of main grooves G stretching in the circumferential direction on the tread surface TS, which is therewith divided into a plurality of ribs R. The tire is installed on a regular rim and filled with the regular internal pressure, and the regular load is applied. Therein a siping S is formed on the ribs R1, R2 in the central area K1 as the regions apart a distance L 0.2-0.35 times as large as the width W of the tire grounding region to each side of the equator CO. Thereby the circumferential direction pattern rigidity of the central area K1 is set to 0.1-0.3 times as large as the circumference direction pattern rigidity of the grounding area. The siping S is given a width 0.1-2.0mm and inclined at an angle 50-60 deg. to the equator CO. |
