| 摘要 |
An intersection of an extended line of a shoulder side arc and an extended line of a side portion arc is a reference point P, an aspect ratio is &bgr;, and an angle &thetas; formed by a straight line A joining the reference point P and a center crown CC and a straight line B in a tire width direction that passes through the center crown CC is configured such that 0.025×&bgr;+1.0≦̸&thetas;≦̸0.045×&bgr;+2.5. A curvature radius Rc of a center portion arc and a curvature radius Rs of the shoulder side arc are configured such that 12≦̸Rc/Rs≦̸30. A reference developed width L from a tire equatorial plane CL to an edge of the shoulder side arc on a tire width direction inner side and a developed tread width TDW are configured such that 0.2≦̸L/(TDW/2)≦̸0.7.
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