| 摘要 |
PROBLEM TO BE SOLVED: To improve run-flat performance which is the continuous running performance after a puncture by setting the tire profile constant for a unit peripheral length defined by a specific equation of the radius of curvature of a first circular arc, the radius of curvature of a second circular arc and the distance in the tire radial direction to a specific value or below. SOLUTION: An intersection between a tire radial line passing through the inner face position of a rim flange and a tire intermediate line on the tread side is made a first point, and an intersection on the bead section side is made a second point. The radius of curvature of a first circular arc tangent to the tire intermediate line at the first point is Ra, the radius of curvature of a second circular arc tangent to the tire intermediate line at the second point is Rb, and the distance from the first point to the second point in the tire radial direction is H. The tire profile constant J for a unit peripheral length defined by the equation is 0.8 or below, where Z=h2/6, and (h) indicates the thickness of a side wall section on the tire axial line. The run-flat performance of this tire can be improved.
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