| 摘要 |
<p>It is an object to ensure the strength of a carcass line, enhance durability with respect to high applied loads, and be able to suppress the input of compressive force with respect to a carcass ply without increasing mass and cost. When W denotes a distance from a tire equatorial plane (CL) to a tire axial direction outermost point (P) of a carcass body portion (22C) and D denotes a tire radial direction height from bead base portions (30) to a carcass body portion (22A) at the tire equatorial plane (CL), a radius of curvature (R1) of a carcass ply (12) in a range from the tire equatorial plane (CL) to a position (P1) located 0.6W away from the tire equatorial plane (CL) in the tire axial direction, a radius of curvature (R2) of a carcass body portion (22B) in a range from the position (P1) to a position (P2) located 0.7D on the tire radial direction outer side from bead base portions (30), and a radius of curvature (R3) of the carcass body portion (22C) in a range from the position (P2) to a position (P3) located 0.3D on the tire radial direction outer side from the bead base portions are such that 0.07 ‰¤ R2/R1 ‰¤ 0.11 and 0.5 ‰¤ R2/R3 ‰¤ 0.7.</p> |
