| 摘要 |
A pneumatic tire has a specified running direction, and comprises a pair of sidewalls, a tread provided with at least one circumferential groove extending in parallel to an equatorial plane of the tire, a plurality of lug grooves intersecting this at least one circumferential groove, and land portions defined by the at least one circumferential groove and the lug grooves intersecting the former groove. Axially narrow portions and axially wide portions are periodically formed for the above at least one circumferential groove by axially waving at least one of opposite sidewalls of at least one circumferential grooves in an axial direction. Each of the lug grooves is combined with or meets the at least one circumferential groove at an area located between an axially most narrowed portion of the circumferential groove and an axially most widened portion of the circumferential groove which is to contact a road prior to the axially narrowed portion during a forward running.
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