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 pneumatic radial tire for passenger vehicles of the present disclosure includes a carcass toroidally spanning between a pair of bead portions and including plies of radially arranged cords. A sectional width SW and an outer diameter OD of the tire satisfy a predetermined relational expression. At least one noise reducer is provided on an inner surface of the tire. A ratio L (mm)/S (mm.sup.2) is in a range from 0.02 to 1.5, where L (mm) denotes a circumferential length of the noise reducer and S (mm.sup.2) denotes a cross-sectional area of the noise reducer.

A pneumatic radial tire for passenger vehicles of the present disclosure includes a carcass toroidally spanning between a pair of bead portions and including plies of radially arranged cords. A sectional width SW and an outer diameter OD of the tire satisfy a predetermined relational expression. The noise reducer is provided on an inner surface of the tire at least in the center region and the shoulder regions. Among thicknesses of the noise reducer measured in a direction perpendicular to the inner surface of the tire, a maximum thickness Tc in the center region is larger than a maximum thickness Ts in the shoulder regions.

A pneumatic tire includes a carcass layer and belt layers including belt cords inclined with respect to a circumferential direction, the belt cords of different layers being arranged in a criss-cross manner. In at least one belt layer, an inclination angle α of the belt cords with respect to the circumferential direction at a center position and an inclination angle β of the belt cords with respect to the circumferential direction at a belt end position satisfy 15°≤β<α≤35°. A maximum ground contact length L1 and a ground contact length L2 satisfy 0.8≤L2/L1≤1.0, where L1 is the maximum ground contact length in the circumferential direction, W1 is a maximum ground contact width in a radial direction, and L2 is the ground contact length in the circumferential direction at a position 40% of W1 from the center position outward in a lateral direction.

A pneumatic tire includes blocks (36 and 41) formed by main grooves (10 and 15) extending in a circumferential direction of the tire and lateral grooves (20 and 25) extending in a tire width direction, and notches (50, 60, and 70) in stepped side end portions of the blocks (36 and 41). The lateral grooves (20 and 25) extend obliquely such that a tire grounding end (E) side is grounded later. Portions adjacent to the notches (50, 60, and 70) on the tire grounding end (E) side of the notches (50, 60, and 70) are protrusions (51, 61, and 71) protruding while forming an acute angle toward a tire equator (C) side.

A pneumatic tire includes a tread portion, sidewall portions, a pair of bead portions embedded with bead cores, and a carcass. The carcass includes a turned up ply including a main body portion extending between the bead cores, and a pair of turned up portions turned up around the bead cores from axially inside to outside. Each bead portion is provided with an inner apex rubber extending radially outward from the bead core between the main body portion and the turned up portion and an outer apex rubber arranged axially outside the turned up portion. The inner apex rubber has a radial height of from 18 to 30 mm. A buttress thickness D, a maximum width thickness E, and a bead thickness F satisfy Expressions (1) to (4):

E≥4.5 mm  (1)

F≥9.0 mm  (2)

E/D=0.6 to 0.9  (3)

F/E=1.7 to 2.2  (4).

A tire 1 includes a pair of crown circumferential grooves 30, a pair of shoulder circumferential grooves 31, a crown land portion 40, and a pair of middle land portions 41 and 42, the crown land portion 40 includes a main crown shallow groove 100 and at least two sub-crown shallow grooves 101 and 102 each extending so as to communicate with the crown circumferential groove 30 and the main crown shallow groove 100, the pair of middle land portions 41 and 42 include V-shaped slots 201 and 202, respectively, and the sub-crown shallow grooves 101 and 102 and the slots 201 and 202 are located so as to be substantially point-symmetrical about a midpoint between positions at which the adjacent sub-crown shallow grooves 101 and 102 communicate with the main crown shallow groove 100.

A tire 1 comprises a tread portion 2 provided with a plurality of blocks 5 arranged therein. The blocks 5 include at least one first block 20 comprising a first part 6 arranged on one side in a tire circumferential direction and a second part 7 arranged on the other side in the tire circumferential direction. The first part 6 extends in the tire circumferential direction with a substantially constant width (Wa) in a tire axial direction. The second part 7 has a width (Wb) in the tire axial direction larger than that of the first part 6 so that the second part 7 protrudes axially outwardly from the first part 6 so as to protrude more toward one side in the tire axial direction.

A tire comprises a tread portion 2. The tread portion 2 is provided with at least one main groove 3 extending continuously in a tire circumferential direction. A first groove wall 10, which is one of groove walls of the main groove 3, is provided with at least one first recessed portion 11 recessed outwardly in a groove width direction from a corresponding one of groove edges 6 of the main groove on a ground contacting surface of the tread portion 2. In the first recessed portion 11, a recess amount from the corresponding one of the groove edges 6 gradually decreases toward both sides in the tire circumferential direction from a deepest portion 15 recessed most outwardly in the groove width direction.

A pneumatic tire having a side portion and a clinch portion, wherein: in a meridian cross section, the distance from a bead baseline to the outside portion in the width direction of the clinch portion is greater than the distance to the inside portion in the width direction; the E*.sub.S of the side portion, as measured at 70° C., a frequency of 10 Hz, an initial distortion of 5%, and a distortion rate of 1%, is less than the E*.sub.C of the clinch portion; and, formulas (1) and (2) are satisfied:

1600≤(Dt.sup.2×π/4)/Wt≤2827.4  (1)

[(V+1.5×10.sup.7)/Wt]≤2.88×10.sup.5  (2)

where Wt is the cross-sectional width of the tire installed on a standardized rim and filled with air to an internal pressure of 250 kPa, Dt is the outer diameter, and V is the volume of the tire.