A pneumatic tire includes plural land portions that are provided at a tread and that are partitioned by plural circumferential direction grooves that extend along a tire circumferential direction. A lug groove is provided at at least one land portion among the plural land portions and crosses the land portion in a tire width direction. A fine groove is provided at a groove bottom portion of the lug groove, has a narrower groove width than the lug groove, and has a groove bottom face formed with a circular arc shaped profile when viewed in cross-section at right angles to a groove length direction. A coupling curved face joins the groove bottom face and a groove side face at a length direction end portion of the fine groove, to a groove side face of the circumferential direction grooves.

A pneumatic tire comprises: a first block 71 located on a tire equatorial plane and having a recess 62 that inclines with respect to a tire width direction; and a second block 72 located to face the recess of the first block.

A tire includes a tread surface portion with inclined grooves, 2ND longitudinal grooves, and shoulder longitudinal grooves; and an indicator portion that indicates a rotation direction of the tire in which a vehicle travels forward. The inclined groove gradually extends forward in the rotation direction toward a tire equator from the outside in the tire width direction. A front surface among inner surfaces defining the inclined groove includes a first side surface with an inner end portion to which the 2ND longitudinal groove is open, a second side surface positioned closer to an inside than the first side surface and of which an outer end portion is positioned closer to a rear side than the inner end portion of the first side surface, and a stepped surface that connects an inner edge of the first side surface to an outer edge of the second side surface and faces the outside.

An outer shoulder land region includes first shoulder lateral grooves each extending axially inwardly from an outer tread ground contact edge to have a first inner end in the tyre axial direction within the outer shoulder land region, first outer shoulder lateral sipes each connecting between the first inner end and an outer shoulder main groove, and second outer shoulder lateral sipes each extending axially inwardly from the outer tread ground contact edge to have a second inner end positioned on an axially outer side of the first inner ends. An outer middle land region includes outer middle lateral sipes each smoothly connected with the respective first outer shoulder lateral sipe with the outer shoulder main groove therebetween. Each of the outer middle lateral sipes connects between the outer shoulder main groove and an outer crown main groove and has a third inner end within the outer middle land region.

The pneumatic tire includes a shoulder main groove and a center main groove disposed in one region demarcated by a tire equatorial plane and a shoulder land portion and a middle land portion defined by the shoulder main groove. The shoulder land portion is a rib that is continuous in a tire circumferential direction, and the middle land portion includes a plurality of middle lug grooves and a plurality of middle blocks defined by the plurality of middle lug grooves. When defining a section in the tire circumferential direction along an edge portion of one middle block close to the shoulder main groove, a groove width of the shoulder main groove continuously increases or decreases in the section.

A pneumatic tire includes a tread; sidewalls; and beads. Lug grooves are formed in the tread inclining symmetrically about an equator, an inclination angle α of the lug grooves relative to the lateral direction being 15°≤α≤45°. A width W1 of the lug grooves at the tread edge and an interval W2 between the lug grooves at the tread edge satisfying 0.7≤W1/W2≤1.5. Shoulder grooves connecting lug grooves are inclined in an opposite direction to the lug grooves have an inclination angle β relative to the lug grooves being 80°≤β≤100°, a center position of the shoulder grooves being 15% to 35% of tread width TW from the equator. An area A1 of the shoulder grooves and an area A2 of shoulder blocks satisfy 0.2≤A1/A2≤0.6. A groove area ratio of the tread is 0.4 to 0.7.

A tire includes a tread portion. The tread portion includes a pair of shoulder main grooves and a plurality of crown blocks. Each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction. The main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

The present invention provides a system and method for altering the audible sounds generated by a tire during operation by altering airflow through the tread. The tread includes tread blocks and the tread blocks include a plurality of tread block sides. Airflow through the tread blocks is altered by notches placed in the tread block sides. In an embodiment, at least one tread block side includes a notch. The notch serves to alter airflow through the tread of the tire and alter the audible sounds of the tire.

A pneumatic tire comprises at least one block partitioned by a groove, the at least one block comprises a plurality of corners including a first corner, the at least one block comprises a first corner recess at which a portion toward the exterior in a tire radial direction at the first corner is recessed relative to a reference surface of the groove, and a first corner projection that is arranged toward the interior in the tire radial direction from the first corner recess and that protrudes toward the exterior of the at least one block, and the first corner projection protrudes from the reference surface of the groove.

A tire has a tread portion comprising: a crown land zone provided with a crown auxiliary groove and crown lateral grooves; and a shoulder land zone provided with a shoulder auxiliary groove and shoulder lateral grooves. The axial width of the shoulder land zone is larger than the axial width of the crown land zone. The groove widths of the crown auxiliary groove and the shoulder auxiliary groove are smaller than that of a shoulder main groove. The lateral crown groove comprises a radially outer wide portion and a radially inner narrow sipe-like portion.