Heavy load pneumatic tire for construction vehicles

A heavy load pneumatic tire for construction vehicles comprising:

• side lug rows, at both side regions of a tread surface, formed by a plurality of lugs defined by lug grooves each opening to a respective tread end in a tread width direction, and a central block row aligned on a tire equator and formed by a plurality of blocks disposed between positions at ¼ of a tread surface width from the tire equator;
• and
• a directional tread pattern, with a designated rotation direction, formed by circumferential grooves and width direction grooves that define the blocks of the central block row and have groove widths narrower than that of the lug grooves, wherein
• a distance from the tire equator to a groove wall in each of the circumferential grooves defining the blocks is larger at a leading edge of each block than at a trailing edge of each block, and
• an inclination angle with respect to the tire equator of each of the circumferential grooves defining the blocks is in a range of 15° to 30°, and the groove width of each circumferential groove is in a range of 0.5% to 2.5% of the tread surface width.

A heavy load pneumatic tire for construction vehicles comprising:

• side lug rows, at both side regions of a tread surface, formed by a plurality of lugs defined by lug grooves each opening to a respective tread end in a tread width direction, and a central block row aligned on a tire equator and formed by a plurality of blocks disposed between positions at ¼ of a tread surface width from the tire equator;
• and
• a directional tread pattern, with a designated rotation direction, formed by circumferential grooves and width direction grooves that define the blocks of the central block row and have groove widths narrower than that of the lug grooves, wherein
• a distance from the tire equator to a groove wall in each of the circumferential grooves defining the blocks is larger at a leading edge of each block than at a trailing edge of each block, and
• the width direction grooves defining the blocks extend from the tire equator in a range of at least 10% and less than 25% of the tread surface width and are each in communication with both lug grooves opening to the edges in the tread width direction, and the groove width of each of the width direction grooves is in a range of 3% to 8% of a pitch length of the blocks.