| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of enhancing overturning preventive performance while maintaining steering stability. SOLUTION: A tread surface 11 consists of three arcs A1-A3, and inequalities 0.6≤K1≤0.8 with K1=L1/(TDW×0.5), inequalities 0.9≤K2≤2.0 with K2=TR1/OD, and inequalities 0.40≤K3≤0.48 with K3=(β×TDW)/(100×SW), are respectively satisfied, where TR1 denotes the radius of curvature of the arc A1, L1 denotes the contour range L1 of the arc A, TDW denotes the tread development width, SW denotes the tire sectional width, OD denotes the outside diameter of the tire, andβdenotes the oblateness. A shoulder rubber layer 22 of a rubber composition B is regulated between the position P1 at 0.4-0.5 W and the position P2 at≥0.6 W with the grounding width W at a part of at least the groove depth -1.6 mm from the surface of the tread part 1, a center rubber layer 21 of a rubber composition A is regulated on the center side from the position P1, and the coagulation friction index of the rubber composition B is set to be 50-90% of that of the rubber composition A. COPYRIGHT: (C)2007,JPO&INPIT |
