Large-sized pneumatic radial tires

A large-sized pneumatic radial tire comprising a tread including grooves having alternately directed inclined portions at an angle of 30.degree.-90.degree. with respect to the circumferential direction of the tire, a belt composed of a plurality of rubberized layers each containing steel cords, and a carcass of a substantially radial construction, said tread including two half regions divided with respect to a crown center, one of said regions being a region in a direction of plysteer which is produced due to the tire construction and to the ground contact reaction force acting on said steel cord of at least one rubberized layer disposed near said tread and which acts upon the tire, and the other region being a region opposite to the direction of plysteer;

• characterized by forming a row of small holes only in an island part along its edge near the kicking-out sides of said grooves in said region opposite to the direction of plysteer, said small holes having a depth corresponding to 0.3-1.0 times the depth of said grooves and being arranged at a substantially equal interval corresponding to a size of said grooves depth.