| 摘要 |
A pneumatic tire is provided in the tread portion with zigzag circumferential grooves and axial grooves so that a row of circumferentially arranged blocks is formed on each side of each of the zigzag circumferential grooves. Each of the zigzag circumferential grooves is composed of axially inner and outer circumferential segments and oblique segments. The axially inner and outer circumferential segments are arranged alternately in the tire circumferential direction. The oblique segments connect between the axially inner and outer circumferential segments, whereby the zigzag circumferential groove extends in the form of a trapezoidal wave. The zigzag amplitude is in a range of from 4 to 15% of a half tread width (Tw/2). The width of the zigzag circumferential groove is in a range of from 7 to 13% of the half tread width (Tw/2). The number of the axial grooves connected to each of the zigzag circumferential grooves on both side thereof is in a range of from 8 to 12 when counted in a tire footprint. The axial grooves each have a groove width WY of from 8 to 25% of a pitch length Py between the axial groove and the circumferentially adjacent axial groove.
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