In a pneumatic tire, an outer second land portion, a center land portion, and an inner second land portion have a road contact surface that partially bulges toward the outer side in a tire radial direction from a reference contour line of a tread profile in the cross-sectional view in the tire meridian direction. Additionally, a groove width Wg1 of an outer shoulder main groove, a groove width Wg3 of an inner center main groove, and a groove width Wg4 of an inner shoulder main groove have a relationship of Wg3<Wg1<Wg4, 1.05≤Wg1/Wg3≤1.25, and 1.10≤Wg4/Wg3≤1.30.

Provided is a pneumatic tire. Distances from a tire equator of the first to third main grooves and narrow groove respectively are from 5% to 20%, 20% to 35%, 55% to 70%, and 40% to 60% of a tire ground contact half-width TL/2. First lug grooves reach a ground contact edge on a vehicle inner side and terminate within a first rib, second lug grooves communicate with the third main groove and terminate in a second rib, third lug grooves communicate with the second main groove and terminate within a third rib, fourth lug grooves communicate with the first main groove and terminate within a fourth rib, fifth lug grooves intersect the narrow groove and terminate within the fourth rib and a fifth rib, and sixth lug grooves reach a ground contact edge on the vehicle outer side and terminate within the fifth rib.

A heavy duty tire is disclosed. The distance from the radially outer surface of a belt layer to the tire's inner surface is 15 to 23 mm when measured along a tire radial direction line passing through the bottom of a shoulder main groove. The width of the shoulder main groove is more than the width of a center main groove. The ratio Wc:Wm:Ws of the average width Wc of a center land portion, the average width Wm of a middle land portion, and the average width Ws of a shoulder land portion is 1.00:1.00 to 1.08:1.03 to 1.13. The middle land portion is provided with a plurality of middle axial grooves. The shoulder land portion is provided with a plurality of shoulder axial grooves. The width of the shoulder axial groove is more than the width of the middle axial groove. The angle θs of the shoulder axial groove is more than the angle θm of the middle axial groove with respect to the tire axial direction.

A pair of motor vehicle tires includes a front tire and a rear tire to be mounted respectively on a front wheel and a rear wheel of a two-wheeled vehicle, each tire of the pair having a tread band extending around an axis of rotation. The tread band of the front tire includes a central annular portion straddling an equatorial plane and two annular shoulder portions disposed on axially opposite sides of the central annular portion. The central annular portion includes at least a pair of first grooves extending substantially longitudinally on opposite sides of the equatorial plane in such a way as to form a concavity directed toward the equatorial plane. Each shoulder portion includes a plurality of second grooves isolated from the first grooves and extending substantially transversally so as to form an average inclination with the equatorial plane greater than 90°. The tread band of the rear tire includes instead a module which is replicated along a direction of circumferential development of the tire, the module including: at least one first pair of first grooves inclined in opposite directions with respect to the equatorial plane of the tire; each first groove of the first pair extending along a portion of the tread band between the equatorial plane and a respective shoulder and forming an average inclination less than 60° with the equatorial plane.

A pneumatic tire has a high wet performance with keeping steering stability and wear resistance. Each of the middle land portions (12) is provided with middle sipes (15) and a middle sub-groove (16). Each of the middle sipes (15) has an arc-like shape such that an angle (θ1) with respect to the circumferential direction of the tire gradually increases from its inner end (15i) towards its outer end (15o). A circumferential length (L2) is in a range of from 0.6 to 1.0 times the arrangement pitch (P2) of the middle sipe (15). The middle sub-groove (16) communicates with a shoulder main groove (10), terminates without communicating with a crown main groove (9), and has an arc-like shape having an angle (θ2) that gradually increases from its inner end (16i) to its outer end (16o). A length (L3) of the middle sub-groove (16) is less than the length (L2) of the middle sipe, and the adjacent middle sipe (15) and middle sub-groove (16) overlap one another in the axial direction of the tire.

A pneumatic tire comprises a tread portion provided on each side of the tire equator with a middle land portion defined between a shoulder main groove and a crown main groove each extending continuously in the tire circumferential direction. The middle land portion is provided with axially inside middle lug grooves and axially outside middle lug grooves arranged alternately in the tire circumferential direction. The axially inside middle lug groove is connected to the crown main groove at an angle θ1 of from 20 to 45 degrees with respect to the tire circumferential direction and has an axially inner opened end and an axially outer closed end. The outside middle lug grooves is connected to the shoulder main groove at an angle θ2 of from 60 to 80 degrees with respect to the tire circumferential direction and has an axially outer open end and an axially inner closed end. The tread portion may be provided with a shoulder land portion comprising circumferential sipes, axial grooves terminating at the circumferential sipes, and a circumferentially continuous rib.

A pneumatic tire has a tread portion 2 provided with: an outboard shoulder main groove 4 and an outboard crown main groove 6 extending circumferentially of the tire; first outboard shoulder axial grooves 12a extending from an outboard tread edge Teo to the outboard shoulder main groove 4; second outboard shoulder axial grooves 12b extending from the outboard tread edge Teo and terminating without reaching to the outboard shoulder main groove 4; first outboard middle axial grooves 16 extending from the outboard shoulder main groove 4 and terminating without reaching to the outboard crown main groove 6; and second outboard middle axial groove 22 extending from the outboard crown main groove 6 and terminating without reaching to the outboard shoulder main groove 4. The first outboard middle axial grooves 16 are aligned with the first outboard shoulder axial grooves 12a, respectively, so as to smoothly continue to the first outboard shoulder axial grooves 12a through the outboard shoulder main groove 4.

A motorcycle tyre has a tread band (8) comprising a plurality of grooves that form a tread pattern including a module (T) replicated along a circumferential direction of the tyre (1) and having a predetermined circumferential length (C1). The module (T) comprises a pair of circumferential grooves (20) arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre (1). Such circumferential grooves (20) extend along the circumferential direction of the tyre (1) for only part of said predetermined circumferential length (C1) and define between them a central portion (A) of tread band (8) having a void to solid ratio substantially equal to zero and a predetermined axial width (A1). The module (T) further comprises a plurality of transversal grooves (30, 31, 32, 33) arranged on opposite sides with respect to the equatorial plane (X-X) at a distance from said equatorial plane (X-X) greater than that of said circumferential grooves (20) and a pair of first lateral annular portions (B) axially arranged between said circumferential grooves (20) and said plurality of pairs of transversal grooves (30, 31, 32, 33), each of said first lateral annular portions (B) comprising, in a position axially adjacent to the respective circumferential groove (20), a respective part (B1) of tread band having a circumferential length at least equal to that of said circumferential grooves (20) and a void to solid ratio substantially equal to zero. The tyre (1) has a curvature ratio lower than about 0.32.

A pneumatic tire includes: a first and second main grooves extending in a tire circumferential direction; first and second inclined grooves extending obliquely toward the same side with respect to the tire circumferential direction and connected to the first and second main grooves; and a block defined by the first and second main grooves and the first and second inclined grooves. The block includes a sub groove having a first portion and a second portion, the first portion being open to an intermediate portion of the first inclined groove and extending in the tire circumferential direction, the second portion being inclined to a side opposite to the first inclined groove, extending from a terminal end of the first portion in a direction away from the first inclined groove, and being open to the first main groove.

In a pneumatic tire, a plurality of lands include a first land, the first land comprises a plurality of circumferential grooves that extend in a tire circumferential direction and that are arrayed in a tire axial direction, the plurality of circumferential grooves are respectively arranged at portions in the tire circumferential direction of the first land, the plurality of circumferential grooves include a first circumferential groove which is arranged in inwardmost fashion in the tire axial direction, and a second circumferential groove which is arranged in outwardmost fashion in the tire axial direction, and as viewed in a tire meridional section, an inner space area of the first circumferential groove is greater than an inner space area of the second circumferential groove.