| 摘要 |
<p>The purpose of the present invention is to enable the strength of carcass lines to be preserved, durability against high loads to be improved, and the input of compression force to a carcass ply to be suppressed, without increasing mass or cost. When the distance from the equatorial plane (CL) of a tire to an outermost point (P) in the tire axial direction of a carcass body section (22C) is W and the height in the tire radial direction from the bead base section (30) in the equatorial plane (CL) of the tire to a carcass body section (22A) is D, the radius of curvature (R1) for the carcass ply (12) in the range from the tire equatorial plane (CL) to a position (P1) separated by 0.6W in the tire axial direction, the radius of curvature (R2) for a carcass body section (22B) in the range from the position (P1) to a position (P2) at 0.7D from the bead base section (30) on the outside in tire radial direction, and the radius of curvature (R3) for the carcass body section (22C) in the range from the position (P2) to a position (P3) at 0.3D from the bead base section on the outside in the radial direction fulfill the formulae 0.07 R2/R1 0.11 and 0.5 R2/R3 0.7.</p> |
