A heavy duty pneumatic tire includes a tread pattern that includes circumferential main grooves, a center wide groove extending in a center region between the circumferential main grooves, and center lug grooves disposed in a first center region and a second center region on either side of the center wide groove in the tire lateral direction, the center lug grooves having a linear shape and opening to the center wide groove. The center lug grooves and the circumferential main grooves have a narrower groove width than shoulder lug grooves disposed in a shoulder region. The center lug grooves of the first center region and the center lug grooves of the second center region extend parallel with one another. The center wide groove has a constant groove depth that is shallower than the maximum groove depth of the circumferential main grooves and the center lug grooves.

A tire includes a tread portion that includes a center main groove, an outer main groove provided on an outer side in a tire width direction of the center main groove, and a lug groove extending in a direction intersecting with both main grooves. The center main groove has a zigzag shape in which a first linear portion and a second linear portion are alternately connected. The outer main groove has a zigzag shape in which a long linear portion and a short linear portion are alternately connected. The lug groove has a groove center line intersecting with the short linear portion in the zigzag shape of the outer main groove.

A tire (1) for a sprayer-type agricultural vehicle, which has a speed index at least equal to D for a maximum speed equal to 65 km/h, which tire is intended to be mounted on a rim with a diameter at least equal to 42 inches, the maximum use pressure of which is at least equal to 3.2 bar and the load index of which is at least equal to 170. The Tire has a crown reinforcement (3) having at most 4 crown layers (31, 32, 33, 34), each having reinforcing elements with a tensile breaking force at least equal to 32 daN and having an aramid strand and a nylon or PET textile fibre strand, the aramid strand having a tensile breaking force at least equal to 30 daN.

A pneumatic tire includes circumferential grooves, lug grooves, land portions defined by the circumferential grooves and the lug grooves, and a narrow groove in the land portions that extends in a circumferential direction. At least one of the circumferential grooves that defines the land portions in which the narrow groove is disposed has an amplitude in a width direction while extending in the circumferential direction to be formed in zigzag shape including long and short portions having relatively different lengths. The narrow groove has one or more bent portions where an extension direction changes in the land portions to include a long portion and a short portion having relatively different lengths. The long portion of the narrow groove has an inclination direction in the width direction with respect to the circumferential direction in a direction opposite to the long portion of the at least one of the circumferential grooves.

A tire has a tread including: a first circumferential groove which is closest to a center in a tire width direction among a plurality of circumferential grooves; center land portions placed adjacent to the first circumferential groove at a side near the center in the tire width direction, and a lug groove which extends between a plurality of the center land portions, and which opens to a side near the first circumferential groove. A bridge having a bottom surface which is bulged is formed at a portion of the lug groove near the first circumferential groove. The bridge has a cross-sectional shape of a trapezoid with tapered surfaces in which side surfaces of the lug groove at an end near a center in a longitudinal direction and an end near the first circumferential groove are inclined with heights thereof reduced toward corresponding ends of the bridge.

A tire according to an embodiment has a tread including a circumferential groove, and a lug groove connected to the circumferential groove and extending from a first side in a tire width direction to a second side. The tire includes two first raised portions formed in the circumferential groove on a groove bottom at a positions either side of an end of the lug groove on a side near the circumferential groove, a second raised portion formed on a groove bottom of a portion of the lug groove on a side near the circumferential groove, and a third raised portion formed at an intersection of the circumferential groove with an extension of the lug groove, on at least a part of a groove bottom of a portion surrounded in three directions by the two first raised portions and the second raised portion.

A pneumatic tire comprises a carcass layer, a belt layer disposed on the outer side in the tire radial direction of the carcass layer, and tread rubber disposed on the outer side in the tire radial direction of the belt layer. The belt layer is formed by laminating a pair of cross belts having belt angles with an absolute value from 10° to 45° both inclusive and mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° relative to the tire circumferential direction. The distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10≤Gsh/Gcc. The groove depth (Dsh) and under-groove gauge (UDsh) of the outermost circumferential main groove have a relationship satisfying 0.20≤UDsh/Dsh.

Each sipe wall surface of a sipe in a tread portion of a pneumatic tire includes, along a sipe depth direction, multiple ridge portions and at least one valley portion bending like waves. Where viewed along the sipe depth direction, a recess depth of the valley portion with respect to the ridge portion on one wall surface varies depending on a position in the extension direction, the valley portion extends from a position at which the recess depth is maximized toward a position at which the recess depth is minimized, and the recess depth decreases as the valley portion extends from the side of the maximum-depth valley portion toward the maximum ridge portion. The sipe is provided in at least one of a first half-tread region on a first side or a second half-tread region on a second side in a tire width direction.

A pneumatic tyre having an equatorial plane for an agricultural machine includes a tread having first lugs extending from the first lateral tread edge toward the equatorial plane, having an arcuate leading edge that arcs from the first lateral tread edge to an axial leading nose edge next to a substantially circumferential inner nose edge, and an arcuate trailing edge that arcs from the first lateral tread edge to the substantially circumferential inner nose edge; and second lugs extending from the second lateral tread edge toward the inner equatorial plane, having an arcuate leading edge that arcs from the second lateral tread edge to an axial leading nose edge next to a substantially circumferential inner nose edge, and an arcuate trailing edge that arcs from the second lateral tread edge to the substantially circumferential inner nose edge.

A non directional pneumatic tire is provided for an agricultural irrigation system. The tire includes first and second side walls and a radially outer wall defining an internal inflation chamber. A non directional tread pattern is defined on the tire and includes a plurality of longitudinal protrusions positioned substantially parallel to a rotational axis of the tire. The longitudinal protrusions are arranged in first and second rows extending from the first and second side walls toward and across the equatorial plane of the tire. The longitudinal protrusions of the first and second rows circumferentially alternate with each other and there is a circumferential spacing between adjacent longitudinal protrusions at the equatorial plane so that no portion of one longitudinal protrusion circumferentially coincides with or overlaps another.