A tire comprises, in the central part of its crown, at least one undulation (51) with a radial amplitude A of the radially outermost crown layer, circumferential furrows (24) and open grooves (25), some of these grooves being radially on the outside of the undulation (51). At least 50% of these grooves (25) are said to be adapted to the undulation. An open groove adapted to the undulation which it is radially on the outside of is such that the intersection points Ps of the bottom curve Cf of said groove and of the furrows (24) are at a distance from the radially outermost point Pext of said bottom curve Cf by a radial distance d2 at least equal to one third of the radial amplitude (A/3) of the undulation (51) and such that the curve Cf increases radially from the intersection points Ps to the point Pext.

The present invention aims to provide tires which provide improved overall performance in terms of fuel economy, life performance, wet grip performance, and handling stability. The present invention relates to a tire including a tread, the tread containing a rubber component, a silica having a nitrogen adsorption specific surface area of 200 m.sup.2/g or more, and a softener, the tread satisfying the following relationship (A):

0.25≤total silica content(parts by mass)/(total softener content(parts by mass)×main groove depth(mm))≤0.60.

Provided is a tire comprising a tread formed of a rubber composition comprising a rubber component comprising 0 to 50% by mass of an isoprene-based rubber, wherein the tire satisfies the following conditions (1) to (6): (1) when a tan δ at 30° C. (tan δ.sub.30° C.) is A, A≥0.12, (2) when a ratio (EB.sub.80° C./EB.sub.23° C.) of an elongation at break at 80° C. (EB.sub.80° C.) to an elongation at break at 23° C. (EB.sub.23° C.) is B, 0.60≤B≤1.00, and (3) when an abrasion resistance index with a tire of Comparative example 1 being 100 as measured by a LAT tester is C, 110≤C≤140, (4) when a ratio (LAND.sub.Sh/LAND.sub.Cr) of a land ratio of the entire pair of shoulder parts (LAND.sub.Sh) to a land ratio of the crown part (LAND.sub.Cr) is D, 0.80≤D≤2.00, (5) when a maximum groove depth of the circumferential main groove is E (mm), 5≤E≤20, and

[00001]$\begin{array}{cc}25\le \left(B\times C/A\right)\times \left(D/E\right)\le 200.& \left(6\right)\end{array}$

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).

Provided is a pneumatic tire with wet steering stability performance and dry steering stability performance enhanced in a well-balanced manner.

A dimple group is composed of a plurality of dimples (100 to 104) disposed at intervals and aligned in a tire circumferential direction. When the minimum center-to-center distance between different dimples (100, 102) in an identical dimple group is defined as K and the minimum center-to-center distance between dimples (104, 100) in different dimple groups is defined as L, the ratio L/K is 3.5 or more and 10.0 or less and the minimum center-to-center distance L is 20 mm or more and equal to or less than a ground contact length.

Provided is a tire including a tread portion. The tread portion can include a first shoulder land portion. The first shoulder land portion 11 can include a shoulder lateral groove and a shoulder sipe. The shoulder lateral groove can include a minimal portion in which a groove width of the shoulder lateral groove is smallest, between a ground contact surface and a groove bottom of the shoulder lateral groove. A width of the shoulder sipe may not be greater than 1.5 mm. An internal groove having a groove width greater than the width of the shoulder sipe can be continuously disposed inwardly of the shoulder sipe in a tire radial direction. The internal groove can be disposed inwardly of the minimal portion and outwardly of the groove bottom of the shoulder lateral groove, in the tire radial direction.

A pneumatic vehicle tire for utility vehicles has a profiled tread having two circumferential ribs that are adjacent and are separated by a circumferential groove of depth H formed from radially inner and outer extension sections of height H.sub.1 and H.sub.2. The groove in the radially inner extension section is a channel of height H.sub.1 and breadth B.sub.1, and in the outer extension section is configured, along its circumferential extent, with an alternating sequence of first and second circumferential regions. The two flanks in the first regions are each configured, in the transition to the outer surface of the rib, with a chamfer of height H.sub.4 such that H.sub.4<H.sub.2, and are spaced by a distance B.sub.2 along their radial extent in the outer extension section from radially inward to radially outward as far as the chamfer.

A tire has a tread portion bound with an intended tire rotational direction. The tread portion includes a first tread edge and a second tread edge. The tread portion is provided with first oblique grooves extending obliquely toward a heel side in the tire rotational direction from the first tread edge toward a tire equator side, second oblique grooves extending obliquely toward the heel side from the second tread edge toward the tire equator side, and first circumferential grooves each connecting a respective pair of the first oblique grooves adjacent to each other in a tire circumferential direction. The first oblique grooves have the tire equator side end portions intersecting with the second oblique grooves. The second oblique grooves have the tire equator side end portions intersecting with the first oblique grooves. The first circumferential grooves have groove widths each increasing toward the heel side in the tire rotational direction.

A pneumatic tire is provided which has sufficiently reduced rolling resistance during high-speed running and which has sufficiently improved durability. In this pneumatic tire, which has a tread, at least one rubber layer forming the tread includes a rubber component containing styrene butadiene rubber and isoprene rubber, and is formed from a rubber composition with a loss tangent (30° C. tan δ) less than or equal to 0.14, measured under the conditions of 30° C., frequency 10 Hz, initial strain 5%, and dynamic strain rate 1%; defining Wt (mm) as the cross-section width, Dt (mm) as the outer diameter and virtual volume V (mm3) as the volume of the space occupied by the tire when said tire is installed on the standardized rim and has an internal pressure of 250 kPa, the pneumatic tire satisfies (Formula 1) and (Formula 2).

1600≤(Dt.sup.2×π/4)/Wt≤2827.4  (Formula 1)

[(V+1.5×10.sup.7)/Wt]≤2.88×10.sup.5  (Formula 2)

The present invention provides a pneumatic tire which is sufficiently reduced in the rolling resistance during high-speed travel, while having sufficiently improved chipping resistance. A pneumatic tire which has a tread part, wherein: at least one rubber layer that forms the tread part contains a rubber component that contains an isoprene rubber, a styrene butadiene rubber and a butadiene rubber, while containing more than 5 parts by mass but 25 parts by mass or less of carbon black relative to 100 parts by mass of the rubber component; and if Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outer diameter of the tire, and V (mm.sup.3) is the virtual volume that is the volume of the space occupied by the tire when this pneumatic tire is installed on a standardized rim and the internal pressure is 250 kPa, (formula 1) and (formula 2) are satisfied.

1700≤(Dt.sup.2×π/4)/Wt≤2827.4  (formula 1)

[(V+1.5×10.sup.7)/Wt]≤2.88×10.sup.5  (formula 2)