The tire has tread bands including profile ribs that extend in a circumferential direction and are separated from each other by peripheral grooves. A groove bottom (4) is inclined relative to an axial direction below an acute angle (beta) of upto 20 degrees in one of the grooves running on a tread band edge side, and rose in a direction to a tread band outer side if viewed in a cross-section. A transition region between the bottom and a groove flange (3) at a deep point of the bottom is rounded with a small radius (R1) than a transition region between the bottom and another groove flange (3').
