| 摘要 |
Pneumatic tire comprises circumferential grooves including pair of axially outer grooves disposed one on each side of tire equator and axially inner groove(s) between axially outer grooves, to divide tread portion into at least four circumferential regions including pair of axially inner regions and pair of axially outer regions. A pneumatic tire comprises a tread portion provided with circumferential grooves, main oblique grooves and auxiliary oblique grooves. The circumferential grooves include a pair of axially outer grooves disposed one on each side of the tire equator and at least one axially inner groove between the axially outer grooves, to divide the tread portion into at least four circumferential regions including a pair of axially inner regions between the axially outer grooves and the at least one axially inner groove and a pair of axially outer regions axially outside the axially outer grooves. The main oblique grooves each extends across one of the axially inner regions so that the axially outer end is connected with the adjacent axially outer circumferential groove and the axially inner end is connected with the adjacent axially inner groove. The auxiliary oblique grooves are arranged alternately with the main oblique grooves in the circumferential direction of the tire, and each extends from the adjacent axially outer circumferential groove to one of the axially adjacent main oblique grooves. The axially inner regions each has an axial width 0.15-0.25 times the critical tread width. The main oblique grooves each has an inclination angle (q1) of 45-90[deg] at the axially outer end, and an inclination angle (q2) at the axially inner end which is less than the inclination angle (q1), when measured with respect to the tire circumferential direction. |
