A pneumatic tire is provided with a tread, a pair of sidewalls, and a pair of beads. A plurality of bending grooves are provided in an intermediate land located on the inner side of each shoulder main groove. Each of the bending grooves has one end portion opening to the shoulder main groove and the other end closed in the intermediate land. Each of the bending grooves is composed of a first tilting groove portion extending from the opening end portion to the bending portion and a second tilting groove portion extending from the bending portion to the closed end portion. The direction oriented from the opening end portion of the first tilting groove portion toward the bending portion coincides with the rotational direction, and the second tilting groove portion is bent toward the first tilting groove portion with the bending portion serving as an apex.

A tread portion of a pneumatic tire is divided into a center region at a center portion in a tire width direction and shoulder regions disposed on both sides of the center region. Each of the center region includes ribs which are formed by a plurality of main grooves extending in a tire circumferential direction. The shoulder region includes: a plurality of inclined grooves which are inclined toward the outside in a tire width direction and toward a direction opposite to a tire rotational direction at the time of advancing a vehicle; and a shoulder block surrounded by the inclined grooves.

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 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 tread portion of a pneumatic tire in which a tread pattern is formed includes: a first circumferential groove extending in a tire circumferential direction; a second circumferential groove outward of the first circumferential groove in a tire width direction; a first lug groove group containing first lug grooves disposed in the tire circumferential direction, each first lug groove extending, inclined with respect to the tire width direction, from the second circumferential groove toward the first circumferential groove; and a second lug groove group containing second lug grooves disposed in the tire circumferential direction, each second lug groove being disposed between the first circumferential groove and the second circumferential groove with both ends disposed at a position spaced apart from the first circumferential groove, the second circumferential groove, and the first lug grooves, and intersecting with at least two of the first lug grooves.

A pneumatic tire reduces the columnar resonance noise of the tire while controlling the lowering of wet performances, wherein four circumferential grooves continuously extending in the circumferential direction of the tire are disposed in a treading face and a plurality of lateral grooves each having one end opened to the circumferential groove and terminated in a land portion are formed with respect to two circumferential grooves among the four circumferential grooves, and these lateral grooves and the respective circumferential grooves have such a groove width that both groove walls of the groove do not contact with each other in a ground contact face and one or more lateral groove are always completely included in the ground contact face, and an extending length of a portion of each lateral groove in the ground contact face having a groove width of the lateral groove corresponding to not less than 30% of a groove width of the circumferential groove is made not less than 40% of an extending length of the circumferential groove in the ground contact face.

A pneumatic tire includes a rib formed in a center region of a tread portion and extending continuously in a tire circumferential direction. The rib has a plurality of respective recessed portions disposed along the tire circumferential direction at a center portion thereof. A bottom surface of each of the plurality of recessed portions is formed of a pair of inclined surfaces respectively deepened toward both sides. A groove portion extending in a tire width direction toward a kicking-out side in the tire circumferential direction is configured to communicate with one side of the recessed portion.

There is provided a pneumatic tire which exhibits excellent durability while improving driving comfort. A pneumatic tire includes: a buttress portion; and a plurality of circumferential grooves formed on the buttress portion and extending in a tire circumferential direction. A ridge extending in the tire circumferential direction is formed in each of the plurality of circumferential grooves. A length of the ridge is not smaller than 50% of a length of the circumferential groove in the tire circumferential direction.

A pneumatic tire includes: a zigzag circumferential direction groove that is formed in a tread portion by alternating and continuously formed first inclined portions and second inclined portions, the first inclined portions being inclined with respect to a tire circumferential direction and the second inclined portions being inclined in the opposite direction to the first inclined portions with respect to the tire circumferential direction; first lug grooves that are inclined in the same direction as the first inclined portions with respect to the tire circumferential direction and that merge with the first inclined portions; and second lug grooves that are inclined in the opposite direction to the first inclined portions with respect to the tire circumferential direction and that intersect the first inclined portions.

A tread pattern of a pneumatic tire includes a land portion being continuous around an entire circumference of the tire and continuous from a first circumferential groove to a tire ground contact edge in a tire width direction; a first inclined groove that extends in the tire circumferential direction from a position spaced outwardly apart from the first circumferential groove in the tire width direction, a first lug groove that extends from an outward end portion in the tire width direction of the first inclined groove to the ground contact edge, and a second inclined groove shorter in the tire circumferential direction than the first inclined groove, the second inclined groove extending from a land portion spaced apart from the first inclined groove and the first lug groove in the tire circumferential direction to a portion where the first incline groove and the first lug groove connect.

A motorcycle tire set includes a front wheel tire and a rear wheel tire each provided with a plurality of inclined grooves. Each inclined groove includes a first portion extending in a crown region, a second portion extending in a shoulder region, and a third portion connecting the first portion and the second portion. Each third portion includes a first groove edge located on a leading edge side in a tire rotation direction, and a second groove edge located on a trailing edge side in the tire rotation direction. The first groove edge of the front wheel tire is provided with a chamfered portion, and the second groove edge of the rear wheel tire is provided with a chamfered portion.