| 摘要 |
PROBLEM TO BE SOLVED: To minimize right and left wheel difference of lateral fluctuating force so as to improve straight advancing stability. SOLUTION: In this pneumatic tire, the surface of tread flat parts 18 is separated from a curve enveloping the whole tread surface on tire cross section, inward in the radial direction of the tire toward the shoulder side from the center side, and a bias exponent R=1-1.25α-(1-β)-(1-γ)-0.017.θof a ground load burden at the tread flat parts 18. Consisting of the separation quantityα, the flat part decrease ratioβof lug grooves 24 to the tread flat parts 18, a lug groove depth change ratioγ(=ri /ro , where ri represents lug groove center end part depth and ro represents shoulder side end depth), and circumferential direction groove inclinationθ(deg) is set into a range of 0.3-0.7. |
