Pneumatic vehicle tyre having a tread with at least one block row (1, 2, 3) which runs around in the circumferential direction and is separated from further profile positives by at least one circumferential groove (7, 8), and the profile blocks (1a, 2a, 3a) of which are separated from one another in the circumferential direction by transverse grooves (4, 5, 6) and have block edges (10, 11, 12, 11′, 12′) which bound the at least one circumferential groove (7, 8) and transverse grooves (4, 5, 6) and extend at an angle (a) of 0° to 10° with respect to the radial direction. Projections (13, 14) are formed along block edges (10, 11, 12, 11′, 12′), radially inside the block surface forming the tread surface, said projections (13, 14) having a surface (13a, 14a) which runs parallel to the block surface and having an edge extending parallel to the block edge (10, 11, 12, 11′, 12′) at a distance (a2) of 0.3 mm to 1.0 mm, from which edge an end face (13b, 14b), which bounds the projection (13, 14), runs as far as the groove base, said end face (13b, 14b) running at an angle with respect to the radial direction which is up to 7° larger than that of the respective block edge (10, 11, 12, 11′, 12′).

A tire having a tread with a novel groove structure for enhanced wet and snow traction is provided. The groove includes an upper portion and a lower portion that can provide enhanced wet and snow traction over various stages of tread wear without unnecessary compromise to the tread rigidity. The lower portion includes one more voids for the accumulation and/or evacuation of fluids.

A heavy-duty pneumatic tire includes a tread pattern including center lug grooves, shoulder lug grooves, a pair of circumferential primary grooves formed in wave-like shapes by alternately connecting ends of the center lug grooves and ends of the shoulder lug grooves and having a smaller width than the width of the shoulder lug grooves, center blocks defined by the center lug groove and the circumferential primary grooves, and a circumferential secondary groove extending in the tire circumferential direction so as to divide regions of the center blocks. The belt portion includes two or greater pairs of belts. The ratio of the width W8 of a belt having a smaller width in each of the belt pairs to the width W7 of a belt having a greater width is 0.75 or greater and 0.90 or less.

A pneumatic tire includes a tread portion provided with a circumferentially extending zigzag shoulder main groove arranged proximate to a tread edge, and a plurality of shoulder lateral grooves each extending axially outwardly from the shoulder main groove. Each of the shoulder lateral grooves includes a first portion and second portion. The first portion includes a first groove wall and an axially inner end connected to the shoulder main groove. The second portion is arranged axially outward of the first portion and includes a second groove wall. The second portion has a groove width and a groove depth greater than those of the first portion. The first groove wall of the first portion and the second groove wall of the second portion are smoothly continued.

A pneumatic tire is provided with four or more circumferential main grooves extending in a tire circumferential direction and five or more land portions defined by the circumferential main grooves. Additionally, second land portions are each provided with first through lug grooves and second through lug grooves that extend through the second land portion in a tire lateral direction and are adjacently arranged in the tire circumferential direction. Crossing angles of the first through lug grooves and the second through lug grooves with respect to the outermost circumferential main grooves are mutually different.

A pneumatic tire includes a tread portion provided with at least one circumferentially extending main groove, and at least one lateral groove extending from the main groove. The at least one lateral groove comprises a bottom, and at least one stepwise groove wall that includes at least one level part, wherein the number of level part is not more than three. In a cross-sectional view of the lateral groove, a depth Da from a ground contacting surface of the tread portion to a radially innermost level part is in a range of from 50% to 80% a maximum groove depth D4 of the lateral groove, and a width Wa from the radially innermost level part to a groove edge of the stepwise groove wall measured along in a groove width direction is in a range of from 50% to 150% the depth Da.

A tire includes a tread portion provided with a first main groove disposed between the tire equator and a tread edge and extending continuously in the tire circumferential direction; outward transverse grooves extending axially outwardly from the first main groove; and inward transverse grooves extending axially inwardly from the first main groove. The first main groove is a zigzag groove including axially outer segments extending along the tire circumferential direction; axially inner segments extending along the tire circumferential direction and positioned axially inside the axially outer segments; and oblique segments linking therebetween. Each of the axially outer segments is connected with one of the outward transverse grooves and one of the inward transverse grooves.

The present technology provides a heavy duty pneumatic tire with a tread portion having a tread pattern including: a pair of circumferential primary grooves defined in a wave-like shape and extending in the tire circumferential direction; center lug grooves; center blocks; and circumferential secondary grooves extending in regions of the center blocks and open to the center lug grooves. The center lug grooves have two groove turning portions turned in a bend shape or a curved shape. The circumferential secondary grooves extend in an inclined manner relative to the tire circumferential direction. An inclination angle (θ.sub.4) of the circumferential secondary grooves relative to the tire circumferential direction is different from an inclination angle (θ.sub.1) of portions of the circumferential primary grooves relative to the tire circumferential direction, the portions extending toward the same side as a side in the tire width direction, toward which the circumferential secondary grooves are inclined.

A pneumatic tire with improved heat build-up resistance in a land portion in a tread center region. The pneumatic tire is provided with a tread pattern that includes a plurality of center lug grooves (14) disposed at intervals in a tire circumferential direction that cross a tire equator line; a plurality of shoulder lug grooves (12A, 12B) disposed in intervals between the plurality of center lug grooves in the tire circumferential direction extending outward in the tire width direction, an inner end in the tire width direction being disposed outward of an end of the center lug groove in the tire width direction; a pair of circumferential primary grooves (11A, 11B) extending around an entire circumference of the pneumatic tire in a wave-like shape with the ends of the center lug grooves and the inner ends of the plurality of shoulder lug grooves in the tire width direction alternately connecting to the pair of circumferential primary grooves (11A, 11B); and a circumferential secondary groove (10) disposed on the tire equator line around the entire circumference of the pneumatic tire that intersects the center lug grooves.

A straight line that joins an intersection portion between the center lug groove and the circumferential secondary groove and the end of the center lug groove has an inclination angle with respect to the tire circumferential direction ranging from 55° to 75°.

A tire has a lug that forms a contact patch surface, and a recessed region that extends along a prescribed direction and that is recessed relative to the contact patch surface. The recessed region has a first vertical face that that forms a first edge between the first vertical face and the contact patch surface, and a planar base that extends in a width direction of the recessed region which is perpendicular to the prescribed direction. The planar base has at least two planar regions having mutually different heights and arrayed along the prescribed direction. The recessed region further has a second vertical face that connects the two planar regions and that forms a third edge between the second vertical face and a higher one of the planar regions. The third edge is inclined with respect to both a tire width direction and a tire circumferential direction.