To suppress the generation of partial wear (turn-over wear) generated at the time of traveling continuous corner portions.
In the pneumatic radial tire 10 equipped with a plurality of circumferential grooves on a tire tread surface, low wear resisting rubber 14 having wear resistance by a run born type wear test (JISK6264) of 50 to 95 when the wear resisting index of tread rubber on the other part is made to be 100 is provided so as to have 2 to 10mm width in a tire width direction be larger in a radial direction than the depth of a main groove 12, and be shorter than the thickness of the tread, in a contact zone adjacent to the axial direction outside of a straight main groove 12 in a circumferential direction of a pair of shoulder portions.
Hiroshi Mitani
Takeshi Sugiyama