angle groove 200 communicates to the high angle groove 100 specifically the low angle groove 200 communicates to the end 112 an end 162 see fig2 at a tread shoulder side of the straight groove portion 110 and the straight groove portion 160 the low angle groove 200 is a groove such that an angle formed with the tread widthwise direction d t is small a low angle and runs along the tread widthwise direction d t specifically the low angle groove 200 is a groove such that the angle u03b8 2 formed with the tire circumferential direction d c is 45 degrees or more in view of the tread surface that is the low angle groove 200 is a groove such that the angle u03b8 2 formed by the low angle groove 200 with the tire circumferential direction d c is larger than the angle u03b8 1 formed by the straight groove portion 110 with the tire circumferential direction d c and more gently inclined relative to the tread widthwise direction d t that is of a low angle the circumferential groove 300 is formed at an outer side in the tread widthwise direction d t of the low angle groove 200 the circumferential groove 300 is formed at an outer side in the tread widthwise direction d t from the central region ac the circumferential groove 300 is configured by an.