| 摘要 |
<p>In a heavy duty pneumatic radial tire, when the belt (5) is comprised of not less than three main belt layers (1B, 2B, 3B), a belt layer (Br) other than a belt layer (1B) adjacent to a carcass (4) is a narrow-width rigidity reinforcing layer, or when the belt is comprised of not less than four main belt layers (1B, 2B, 3B, 4B), a belt layer (1Br) adjacent to the carcass (4) and a belt layer (4Br) other than a belt layer (2B) adjacent to the belt layer (1Br) are narrow-width rigidity reinforcing layers. Such a narrow-width rigidity reiforcing layer has a given width (Wr) of 50-60% of the maximum width (Wb) of the main belt layer and an inclination cord angle of 5-15 DEG . <MATH></p> |
