Abstract: A tire for construction vehicles including the lug type, the semi-lug type, and the block type with a ratio of 60-75 percent of the area of the projecting portion of the tread to the total area of the tread having the standard size of 16.00-25 or larger or the wide size of 20.5-25 or larger, wherein the size of the projecting portion of the tread is under the conditions specified by the following formulas:1.0.ltoreq.k.ltoreq.1.3 at 1/8 point1.0.ltoreq.k.ltoreq.1.6 at 1/4 pointsaid "k" designating the quotient of "a" the diameter of a maximum circle to be drawn within the width of the projecting portion by "h" designating the height of the grooves in the tread, and said 1/8 point and 1/4 point designating a point respectively 1/8 and 1/4 of the width of the tread from the end of the tread.