A tire has land rows, and the number of the lands in each of the land rows is defined as the number of pitches. The number of pitches in an inner shoulder land row is the same as the number of pitches in a first land row. The number of pitches in an outer shoulder land row is the same as the number of pitches in a second land row. The number of pitches in the second land row is less than the number of pitches in the first land row.

A pneumatic vehicle tire, in particular commercial vehicle tire, having a tread having in each case one shoulder-side profile rib (1) which is separated in each case from a central tread portion (3) by a wide circumferential groove (2) which is made to profile depth (T) and which runs around rectilinearly in the circumferential direction, wherein the circumferential groove (2) has a rounded groove base (8) and is delimited at the profile rib (1) by a rib flank (6). Recesses (9) are formed on the rib flank (6) of the circumferential groove (3) at the profile rib periphery, which recesses have, in the direction of extent of the circumferential groove (2), a length of extent (1) of 70% to 90% of the profile depth (T), at most of 30 mm, and in each case have, as seen in plan view, boundary surfaces (10a, 10b) which run toward one another in an L shape and extend in the radial direction, and a bottom surface (11), wherein, as seen in plan view, the one first boundary surface (10a) runs into the profile rib (1) at an angle (β) of up to 35° to the axial direction, and the second boundary surface (10b) runs at an angle (β.sub.2) of 90° to 125° to the first-mentioned boundary surface (10a), and wherein bottom surface (11) is situated at a depth (t) of 15% to 25% of the profile depth (T).

A tire includes a tread portion including first and second tread edges, a first shoulder land portion including the first tread edge, and a first shoulder circumferential groove located inwardly in a tire axial direction of and adjacent to the first shoulder land portion and extending continuously in a tire circumferential direction. The first shoulder land portion is provided with a plurality of first shoulder lateral grooves extending from the first shoulder circumferential groove across the first tread edge, each of the plurality of first shoulder lateral grooves has a pair of first groove walls, and the pair of first groove walls is provided with a pair of first chamfer portions that extends from the first shoulder circumferential groove to a first location beyond the first tread edge.

Tire-tread constructions may incorporate multiple circumferential asymmetries. Prime-number values are used for (a) the number of pitches (where a pitch is an individual pattern that is repeated around the circumference of the tire tread); (b) the number of segments of the mold with which the overall tire tread is formed; (c) the number of variations in the lengths of pitches; or (d) the number of variations in the lengths of the segments.

The tire (10) for a passenger vehicle has an axially central portion and axially lateral portions. The axially central portion and each axially lateral portion satisfies just one of conditions I, II, III: I—the portion comprises no transverse cut (90, 90′), II—the portion comprises N transverse cuts (90, 90′) arranged in such a way that π×OD/N≥40 mm, III—the portion comprises N transverse cuts (90, 90′) arranged in such a way that π×OD/N≤24 mm, condition I or II being satisfied by the axially central portion or by an axially lateral portion, and condition III being satisfied by the axially central portion or by an axially lateral portion.

A pneumatic tire includes a shoulder land defined by a circumferential groove having a width of ≥3 mm on a tread and width-direction grooves in the shoulder land. The width-direction grooves include lug grooves having a width at a position at a center of the shoulder land in the width direction of ≥1.5 mm and a depth of ≥50% of a maximum depth of the width-direction grooves on a circumference. Blocks defined by the lug grooves have circumferential lengths varying at the position. A maximum-to-minimum ratio of circumferential lengths of the blocks is ≥1.2 and ≤1.8. The number of blocks on the circumference is N, the circumferential lengths of the blocks are sequentially P.sub.1, P.sub.2, . . . , P.sub.N, the circumferential length of any block is P.sub.i (i=1 to N), the number of blocks satisfying P.sub.i/min(P.sub.i−1, P.sub.i+1)≤0.95 is M.sub.1, the number of blocks satisfying 2P.sub.i/(P.sub.i−1+P.sub.i+1)≤0.95 is M.sub.2, an index R satisfies 0≤R=((M.sub.1.Math.M.sub.2).sup.1/2/N)≤0.2.

Exemplary embodiments described herein are directed to tire pitch sequence design methodologies that are usable to develop tire tread pitch sequences that will minimize objectionable tonal qualities and disperse the acoustic energy produced during tire rotation across a wider frequency band. The exemplary design methodologies employ iterative randomization of pitch subsequences, waveform generation and analysis of pitch subsequences and full pitch sequences, and associated sorting and ranking using an objective function with an applied penalty factor.

There is provided a pneumatic tire with a reinforcing part which is mounted on a tire wheel, the pneumatic tire including: a tread having a groove that is formed in a circumferential direction of the tire wheel as being recessed toward a central axis of the tire wheel, a kerf that is formed to intersect the groove as being recessed toward the central axis of the tire wheel, and one or more blocks that are formed between the groove and the kerf and come into contact with a road surface; a shoulder formed at a side of the tread; and a reinforcing part inserted into the groove formed between the one or more blocks. The reinforcing part reduces noise produced due to contact with the road surface by being bent one or more times.

In a tire, a plurality of outer resonators (25) are formed in an outer land portion (28) partitioned by two outer main grooves (21, 22) and arranged in a tire circumferential direction, a plurality of inner resonators (26) are formed in an inner land portion (29) partitioned by two inner main grooves (23, 24) and arranged in the tire circumferential direction, the outer resonator includes a first vertical groove (31) which extend in the tire circumferential direction, and a first branch groove (32) and a second branch groove (33) which have an inner volume smaller than that of the first vertical groove, extend in the tire width direction from both end portions of the first vertical groove in the tire circumferential direction such that the first branch groove and the second branch groove extend in directions opposite to each other, and are respectively opened to the two outer main grooves, and the inner resonator includes a second vertical groove (36) which extends in the tire circumferential direction, and a third branch groove (37) and a fourth branch groove (38) which have an inner volume smaller than that of the second vertical groove, extend in the tire width direction from the second vertical groove such that the third branch groove and the fourth branch groove extend in directions opposite to each other, and are respectively opened to the two inner main grooves.

Provided is a pneumatic tire that can be obtained without requiring complicated design and has improved noise performance. On the inner vehicle-mounting side, the circumferential pitch length of the tire has pitch variation comprising at least three pitch lengths and, if the number of pitches is n and the pitch lengths (Pi) are Pi1, Pi2, Pi3, . . . , Pin, in order from the greatest pitch length, the pitch lengths satisfy the relationships Pi1/Pi2≤Pi2/Pi3≤ . . . ≤Pin−1/Pin, and Pi1/Pi2.