| 摘要 |
<p>The heavy duty tire comprises a belt layer (7) comprised of at least three belt plies outside of a carcass (6) in a radial direction. Belt cords of a first belt ply (7A) disposed innermost in the radial direction incline at an angle of 45 to 55 degrees with respect to a tire equator C. Belt cords of second and third belt plies (7B,7C) disposed outside thereof incline at an angle of 16 to 22 degrees with respect to the tire equator C and into mutually opposite directions. Width BW3 of the third belt ply (7C) is smaller than width BW2 of the second belt ply 7B and is also 77 to 95% of a tread grounding width TW. Width BW1 of the first belt ply (7A) is smaller than the width BW3 of the third belt ply (7C) by 20 to 35mm. An inter-cord distance S between the first belt ply (7A) and the carcass ply (6A) in the tire radial direction is 0.8 to 1.2 mm. Preferably, an insulation rubber layer (10) is disposed between the carcass (6) and the first belt ply (7A).</p> |
