A motorcycle tire set S includes a front wheel tire S1 and a rear wheel tire S2 each provided with a plurality of inclined grooves 3. Each inclined groove 3 includes a first portion 11 extending in a crown region Cr, a second portion 12 extending in a shoulder region Sh, and a third portion 13 connecting the first portion 11 and the second portion 12. The third portion 13 has a smaller groove width than the first portion 11 and the second portion 12. The first portion 11, the second portion 12, and the third portion 13 are inclined in the same direction with respect to a tire circumferential direction. Each inclined groove 3 of the rear wheel tire S2 comes into contact with the ground from the first portion 11 toward the third portion 13 based on a tire rotation direction R.

A motorcycle tire set S includes a front wheel tire S1 and a rear wheel tire S2 each provided with a plurality of inclined grooves 3. Each inclined groove 3 includes a first portion 11 extending in a crown region Cr, a second portion 12 extending in a shoulder region Sh, and a third portion 13 connecting the first portion 11 and the second portion 12. Each third portion 13 includes a first groove edge 20e located on a leading edge side in a tire rotation direction R, and a second groove edge 20i located on a trailing edge side in the tire rotation direction R. The first groove edge 20e of the front wheel tire S1 is provided with a chamfered portion 10, and the second groove edge 20i of the rear wheel tire S2 is provided with a chamfered portion 10.

A pneumatic radial tire 1 for a passenger car comprises a carcass 6 having a radial structure, a belt layer 7, and a tread portion 2. The tread portion 2 has an outer tread edge (To) and an inner tread edge (Ti). A tread pattern is formed in an asymmetric shape with respect to a tire equator (C). The tread portion 2 is divided into a plurality of circumferential land regions by a plurality of main grooves 10. The circumferential land regions include an outer shoulder land region 16, an inner shoulder land region 17, and a middle land region 18 arranged therebetween. The outer shoulder land region 16 is larger than the inner shoulder land region 17 with respect to rigidity in a tire circumferential direction and the rigidity in a tire axial direction.

A pneumatic motorcycle tire 1 is provided with a tread pattern having an intended tire rotational direction N. The tread portion 2 is provided on each side of the tire equator C with a unit pattern 9 repeatedly arranged in the tire circumferential direction to form the tread pattern. The unit pattern 9 comprises: a first oblique groove 11 extending axially outwardly from a vicinity of the tire equator C and obliquely, while inclining to the rotational direction N; a second oblique groove 12 disposed on the toe-side in the rotational direction N of the first oblique groove 11 and extending therealong; and a narrow oblique groove 15 extending axially outwardly from the axially inner end of the first oblique groove 11 to the axially inner end of the second oblique groove 12, while inclining to the opposite direction to the rotational direction N.

A pneumatic motorcycle tire includes a tread portion provided in each half tread region with a unit pattern repeatedly arranged in the tire circumferential direction to form a unidirectional tread pattern. The unit pattern includes a first groove extending axially outwardly from a vicinity of the tire equator, while inclining to the opposite direction to the intended tire rotational direction; a second groove disposed on the heel-side in the tire rotational direction of the first groove and extending along the first groove; a third groove disposed on the heel-side of the second groove and extending along the second groove; a fourth groove disposed on the heel-side of the third groove and extending along the third groove; and a narrow groove extending from an axially inner end of the first groove to an axially inner end of the fourth groove, while inclining to the intended tire rotational direction.

A pneumatic tire (1) has a tread (2), the direction (R) of rotation of the tread (2) being specified. Crown main grooves (3) and shoulder main grooves (4) are provided in the tread (2) to thereby define middle lands (5B). Each of the middle lands (5B) is provided with middle lateral grooves (18) arranged in separating from each other so as to define middle blocks (20). Each of the middle blocks (20) is provided with: a middle narrow groove (21) which extends from a middle lateral groove (18) on the trailing landing side, in the direction (R) of rotation, toward the leading landing side and which terminates without reaching a middle lateral groove (18) on the leading landing side; an inner sipe (S2) disposed on the inside of the middle narrow groove (21) in the axial direction of the tire; and an outer sipe (S3) disposed on the outside in the axial direction of the tire. The width (W6a) of the middle narrow grooves (21) and the direction of tilt of the inner and outer sipes (s2, s3) are limited to predetermined ranges.

A tread profile is divided into two parts in the axial direction (A) of the tire and has two axially adjacent profile block rows, each of which is formed from profile block elements that are arranged one behind the other over the circumference of the tire and are separated from one another by inclined grooves. The inclined grooves of one profile block row are configured to slope along the axial extent of the inclined grooves through the profile block row, starting from the other profile block row, such that the main direction of extent of the inclined grooves forms an angle of inclination relative to the axial direction (A). The inclined grooves of one profile block row have a direction of inclination which is oriented oppositely to that of the inclined grooves of the other profile block row when seen in the circumferential direction (U).

To enhance the heat radiation of the circumferential groove and to increase the cooling effect of the tread portion, a first circumferential groove is located on the outermost side in the tire width direction and a second is adjacent to the inside in the tire width direction of the first. A first land part is arranged outside the first circumferential groove in the tire width direction, and a second is arranged inside the second circumferential groove in the tire width direction. A plurality of width direction grooves each of which extends with an inclination and has a first end opened to the first circumferential groove and a second end opened to the second circumferential groove. The first end of each of the width direction grooves is located in a further upstream side of the second end of each of the width direction grooves in the air flow direction.

A pneumatic tire includes a tread portion including a pair of first main grooves, a pair of second main grooves, a first land portion between the first main grooves and a pair of second land portions each sectioned adjacent one of the pair of first main grooves and one of the pair of second main grooves. The first main grooves extend in a trapezoidal wave manner including inner elements, outer elements and inclined connecting elements. One of the second land portions is provided with a second lateral groove opened at one of the outer elements. The first land portion is provided with a recess having an opening at the one of the outer elements. In a tire circumferential direction, a center of the opening of the recess is located at a position different from a position of an extension line of a centerline of the second lateral groove.

A tire includes a tread portion including first and second tread edges, three or more circumferential grooves, and four or more land portions. The circumferential grooves include a first shoulder circumferential groove nearest to the first tread edge. Each land portion is provided with only sipes and is not provided with lateral grooves. The land portions include a first shoulder land portion having the first tread edge, and a first middle land portion adjacent to the first shoulder land portion. The first middle land portion is provided with first middle sipes traversing the first middle land portion completely in the tire axial direction. The first shoulder land portion is provided with first shoulder sipes extending from the first shoulder circumferential groove to the first tread edge. The first shoulder sipes have a circumferential pitch length smaller than a circumferential pitch length of the first middle sipes.