A heavy-duty pneumatic tire comprises a crown rib and a middle rib. The crown rib is provided with crown sipes crossing the crown rib. The middle rib is provided with middle sipes crossing the middle rib and a middle shallow groove having a smaller depth and a larger width than the middle sipes. The middle shallow groove comprises a circumferential middle shallow groove extending in a tire circumferential direction and lateral middle shallow grooves extending from an axially inner side edge (Ema) of the middle rib to the circumferential middle shallow groove so as to terminate at a position thereof.

A tire includes a narrow shallow grooved region on a land portion defined by a circumferential main groove. The narrow shallow grooved region includes a plurality of narrow shallow grooves that are not open to the circumferential main groove. A ratio of a total area of the narrow shallow grooved region to a ground contact area of the land portion is not less than 0.05 and not greater than 0.60.

A tire includes circumferential main grooves, lug grooves, and land portions defined by the circumferential main grooves and the lug grooves. The circumferential main grooves extend in a circumferential direction. The lug grooves extend in a width direction, include shoulder and center lug grooves, and have an end opening to a circumferential main groove. Narrow shallow grooves in center and shoulder land portions have an end opening to a circumferential main groove and have a groove depth of 10-40% of a circumferential main groove depth. The shoulder lug grooves are on an outer side of a shoulder main groove in the width direction and have an end opening to the shoulder main groove. The center lug grooves are between the center and shoulder main grooves, have both ends opening to circumferential main grooves, and have a minimum width wider than a minimum width of the shoulder lug groove.

Provided is a motorcycle tire with improved wet grip performance while ensuring the rigidity during turning. Provided is a motorcycle tire in which: a tread portion is composed of a central rubber (11C) and a both-side rubber (11S) having a lower modulus than the central rubber; the boundary is from the tire equator to from ½ to ¾ of the half width of the peripheral length; a tire grounding portion includes a first groove, a second groove, and a third groove; a bent portion of the first groove and a bent portion of the second groove, an inner side end and an outer side end in the width direction of the second groove, an inner side end in the width direction of the third groove are located at positions from ⅛ to ⅜, from ¼ to ½, from 1/16 to 3/16, from ⅝ to ⅞, and from ½ to ⅝ of the half width of the peripheral length from the tire equator; the angles θ1, θ2, θ3, θ4, and θ5 formed by a long groove portion and a short groove portion of the first groove, an outer side groove portion and an inner side groove portion of the second groove, and the third groove with respect to the circumferential direction satisfy θ1≈θ2≈θ3≈θ5, and θ1>θ4; and a distance a between the first groove and the second groove, a distance b between the second groove and the third groove, and a distance c between the third groove and the first groove satisfy a≈b≈c.

A tire includes a pair of shoulder main grooves and one or more center main grooves extending in a tire circumferential direction and four or more rows of land portions defined by the pair of shoulder main grooves and the one or more center main grooves. Each of the pair of shoulder main grooves includes a groove opening portion having a wave-like shape with an amplitude in a tire width direction. Each of the pair of shoulder main grooves includes a groove bottom portion having a zigzag shape with an amplitude in the tire width direction. The groove opening portion in each of the pair of shoulder main grooves has an amplitude A1_sh having a relationship A1_sh<A2_sh with respect to an amplitude A2_sh of the groove bottom portion.

A tire includes a plurality of main grooves extending in a tire circumferential direction and four or more rows of land portions defined by the main grooves. Moreover, a middle land portion and a center land portion have a plurality of through lug grooves that pass through the land portions in a tire width direction, respectively. Pitch lengths of the through lug grooves are in a range of from 7% or greater to 14% or less of a tire maximum ground contact length. Additionally, maximum groove depths of the through lug grooves are in a range of from 5% or greater to 65% or less of maximum groove depths of the main grooves.

In a pneumatic tire, a land portion is formed in a tread surface of a tread portion on an outermost side in a tire lateral direction by a circumferential groove extending in a tire circumferential direction, and a ground contact edge is present in the land portion. The land portion includes a plurality of lug grooves provided in the tire circumferential direction and intersecting the ground contact edge, and an intersecting narrow groove provided outward of the ground contact edge in the tire lateral direction and intersecting a lug groove of the plurality of lug grooves.

A tire includes a tread portion. The tread portion includes two main grooves extending continuously in a tire circumferential direction and a land region defined between the two main grooves. The two main grooves extend in a zigzag manner with phases thereof aligned with each other. The land region is provided with a longitudinal sipe extending in the tire circumferential direction in a zigzag manner with a phase thereof opposite to the phases of the zigzags of the two main grooves.

A tread profile of a vehicle tyre having profile elements (1, 2, 3, 4, 5, 6) which are separated from one another by channels (7, 8, 9, 10, 11) and are delimited radially outwardly by a radially outer surface (12), and with additional shallow grooves (13) which are formed in the radially outer surface (12) of profile elements (1, 2, 3, 4, 5, 6) and are delimited inwardly in the radial direction R by a groove base (14), and are formed with decreasing depth T along the extent of the groove (13), starting from a position of the greatest depth T.sub.MAX of the groove (13) to the extent end of the groove (13) pointing away from the deepest point, characterized in that the groove base (14) is formed with a constantly rising depth profile along the extent of the groove (13), starting from a position of the greatest depth T.sub.MAX of the groove (13) to the extent end of the groove (13) pointing away from the deepest point and formed in the radially outer surface (12), and in that, at least in a first extent portion which extends as far as the extent end in the radially outer surface (12), the depth profile of the groove base (14) is formed such that it rises in a degressive curve and with a tangential transition to the radially outer surface (12).

A pneumatic tire includes: a rib defined by a circumferential main groove; circumferential sipes formed in the rib at intervals in the circumferential direction; rib edge sipes formed in the rib aligning in the circumferential direction, each of the rib edge sipes terminating in the rib opening to the circumferential main groove; and first and second narrow grooves extending in the circumferential direction, each of the first and second narrow grooves having a groove depth shallower than depths of the circumferential sipes and the rib edge sipes, the first narrow grooves having ends connected to one of the circumferential sipes adjacent to each other in the circumferential direction and the second narrow grooves each including an inner connecting portion connected to one of the first narrow shallow grooves and including an outer connecting portion connected to one of the rib edge sipes.