| 主权项 |
1. A heavy duty tire configured such that
a tread portion is provided with circumferential main grooves including a shoulder circumferential main groove positioned closest to a tread edge to form a shoulder land portion between the shoulder circumferential main groove and the tread edge, and the shoulder land portion is divided into a plurality of shoulder blocks by shoulder lateral grooves spaced in a tire circumferential direction, wherein on a meridional cross-section of a tire in a 5% internal pressure state where the tire is mounted on a normal rim and charged with a 5% internal pressure as a normal internal pressure,
a tread profile line on a surface of the tread portion is formed from a first arc portion with a radius of curvature R1 having an arc center on a tire equatorial plane and a second arc portion with a radius of curvature R2 intersecting with the first arc portion at an intersection point Q,an arc center of the second arc portion is positioned on a radial line passing through the intersection point Q,a ratio He/H between a tire radial distance He from an equatorial point at which the tread profile line intersects the tire equatorial plane to the tread edge and a radial distance H from the equatorial point to a virtual tread edge at which a radial line passing through the tread edge intersects an extended line of the first arc portion is 0.5 or more and less than 1.0, andwherein
a ratio R2/R1 between the radius of curvature R2 and the radius of curvature R1 is 0.2 or more and 0.5 or less. |
