A pneumatic tire includes lug grooves arranged in a circumferential direction in a tread surface of a land portion defined by two main grooves adjacent in a lateral direction, the lug grooves each crossing the circumferential direction and communicating at both ends with the main grooves, defining the land portion in the circumferential direction. A notch portion is formed on an opening edge of the lug grooves. The notch portion is cutout from the tread surface inward in a radial direction. The lug grooves have a maximum groove width at a position from 30% to 70% of a lateral direction dimension of the land portion from one of the main grooves and a groove width that decreases from the maximum groove width to the main grooves. The notch portion has a notch width that increases from a position of the maximum groove width of the lug grooves to the main grooves.

A tire has a tread portion bound with an intended rotational direction. The tread portion is provided with at least one block. Each block includes a ground contacting surface, which is defined by edges, and side surfaces positioned radially inside the ground contacting surface. The edges include a heel-side edge located on a heel side in the rotational direction and a toe-side side edge extending toward a toe side in the rotational direction from the heel-side edge. The heel-side edge is connected to one of the side surfaces without having a chamfer portion therebetween. At least a toe-side region, which is a region positioned on the toe side in the rotational direction, of the toe-side side edge is connected to the side surfaces each with the chamfer portion therebetween.

A tyre has a tread portion having a tread ground contacting surface and a main groove having a bottom surface and two groove wall surfaces extending outwardly in a tyre radial direction from the bottom surface. In a lateral cross section perpendicular to a length direction, at least one groove wall surface has an inner groove wall portion connected with the bottom surface and a protruding portion connected with the inner groove wall portion and having a protruding end protruding inwardly in a groove width direction from a groove reference line obtained by extending the inner groove wall portion. The protruding portion has an inclined surface portion extends obliquely between the protruding end and the tread ground contacting surface. When the tread portion in a reference state is loaded with a tyre load of 1.20 times a standard tyre load, the whole inclined surface portion contacts a flat surface.

The tire (10) for a passenger vehicle has an axially central portion and axially lateral portions. The axially central portion and each axially lateral portion satisfies just one of conditions I, II, III: I—the portion comprises no transverse cut (90, 90′), II—the portion comprises N transverse cuts (90, 90′) arranged in such a way that π×OD/N≥40 mm, III—the portion comprises N transverse cuts (90, 90′) arranged in such a way that π×OD/N≤24 mm, condition I or II being satisfied by the axially central portion or by an axially lateral portion, and condition III being satisfied by the axially central portion or by an axially lateral portion.

A tire comprises a tread portion comprising a shoulder land region provided with shoulder lateral grooves and circumferential sipes connecting between the shoulder lateral grooves. The shoulder lateral grooves are each provided with a chamfer. The circumferential sipes are each spaced apart from an axially inner end of the shoulder land region by an axial distance of from 30% to 100% of an axial width of the shoulder land region. The depths of the circumferential sipes are equal to or greater than the groove depths of the shoulder lateral grooves.

In a pneumatic tire, a lug groove is configured so that a portion thereof defining a leading side of a block in a rotation direction is inclined toward a trailing side in the rotation direction as that portion extends outward in a lateral direction from an equator line side. Among small blocks defined in the block by narrow grooves, a small block adjacent to the lug groove defining the leading side of the block in a rotation direction, and to a circumferential main groove defining the equator line side is a leading-side block, and a small block with a portion positioned on a backmost side of the block in the rotation direction is a trailing-side block. Among the small blocks, the trailing-side block has a greater surface area than that of the leading-side block, and intermediate blocks each have a greater surface area than the trailing-side block.

A motorcycle tire has a tread portion. The tread portion has a ground contact surface curved in an arc shape convex outward in a tire radial direction. The ground contact surface includes a central region and a first outer region. The ground contact surface has oblique grooves each including a portion inclined with respect to a tire circumferential direction. Each of the oblique grooves extends across the central region and the first outer region. Each of the oblique grooves includes a vertical groove portion extending at an angle α of 20 degrees or less with respect to the tire circumferential direction. A minimum distance in a tire axial direction along the ground contact surface between the vertical groove portion and an outer edge of the central region is 30% or less of a maximum width in the tire axial direction of the central region along the ground contact surface.

A tyre comprises a tread portion having a main groove extending continuously in a tyre circumferential direction and a pair of land regions adjacent to the main groove on both sides thereof. At least one of the pair of the land regions has, on an edge thereof facing the main groove, a plurality of main groove side step-like portions each having a height decreasing stepwise in two or more steps from a ground contacting surface of the at least one of the pair of the land regions to a bottom surface of the main groove. The main groove side step-like portions include at least a first main groove side step-like portion and a second main groove side step-like portion having different numbers of the steps from each other.

Provided is a pneumatic tire. A chamfered portion and a non-chamfered portion are provided in each of an edge on a leading side and an edge on a trailing side of a sipe. In a meridian cross-sectional view, a profile line of a rib projects further to an outer side in a tire radial direction than a reference tread profile line. A radius of curvature TR of the reference tread profile line and a radius of curvature RR of the profile line satisfy a relationship of TR>RR. The chamfered portions on both the leading side and the trailing side are disposed so as to straddle a maximum projection position. A maximum projection amount D of the rib with respect to the reference tread profile line and a maximum width W of the chamfered portion satisfy a relationship of 0.05 mm.sup.2<W×D<1.50 mm.sup.2.

A tire comprises a tread portion 2. The tread portion 2 has a repeated pattern portion 7 in which a plurality of minimum pattern constituent units 8 is arranged in a tire circumferential direction. Each of the minimum pattern constituent units 8 includes a center block 10, a plurality of surrounding blocks 11 surrounding the center block 10, and dividing grooves 15 each arranged between adjacent ones of the plurality of the surrounding blocks 11. The dividing grooves 15 include first dividing grooves 16 and second dividing grooves 17 inclined in opposite directions to each other.