A tread and tire for a multipurpose agricultural machine, that improves field traction while ensuring a satisfactory compromise with wear under engine torque and vibratory comfort on the road having a tread having a plurality of lugs distributed in a first row extending axially from a first axial end of the tread and in a second row extending axially from a second axial end of the tread, the second row differing from the first row by a symmetry relative to the equatorial plane of the tire followed by a rotation about the rotation axis of the tire, each row having an alternation of long lugs and of short lugs. The axially inner end face of a first long lug of a row of lugs is separated from the trailing lateral face of the second long lug of the symmetrical row of lugs, closest to the axially inner end face of the first long lug, by an end groove with a width at least equal to 10% and at most equal to 100% of the lug height.

A tire for vehicle wheels having a tread pattern includes: a) two circumferential grooves, which define a first and a second shoulder region, and one central region; b) a plurality of asymmetric transverse grooves having a substantially V shape, which extend for the whole width of the tread, including an alternate sequence of a first and a second asymmetric transverse groove defining an alternate sequence of a first and a second asymmetric module; and c) a plurality of lateral transverse grooves, which includes one first lateral transverse groove extending for the whole width of the first shoulder region and for a portion of the central region of the first asymmetric modules, and one second lateral transverse groove extending for the whole width of the second shoulder region and for a portion of the central region of the second asymmetric modules.

A tread for a tire includes a plurality of circumferential rows extending around a radially outer portion of the tire. Each row defines a plurality of tread lugs. Each tread lug has a radially outer surface. The radially outer surfaces have an asymmetric curvature such that a radially outermost point on each surface is not located on an axis of symmetry of each tread lug.

A tire includes a tread portion having an installing direction to a vehicle so as to have an outboard tread edge. The tread portion is provided with a plurality of first inclined grooves each having an inclination to a circumferential direction of the tire and extending from at least a tire equator to the outboard tread edge, a plurality of second inclined grooves each having an opposite inclination to the inclination of the first inclined grooves and extending from at least the tire equator toward the outboard tread edge, and a plurality of blocks separated by the first inclined grooves and the second inclined grooves. Each second inclined groove includes an outboard end that terminates at one of the first inclined grooves so that a plurality of substantially trapezoidal shoulder blocks are arranged along the outboard tread edge.

The invention provides for a heavy truck tire tread having a longitudinal direction, a lateral direction and a thickness direction, said tread comprising : a pair of opposing tread edges (21, 21) spaced apart along the lateral direction; a tread region extending between the tread edges over a rolling tread width (RTW); a shoulder zone (SZ) adjacent to each tread edge of said pair of opposing tread edges and extending over a lateral length of 10% of the rolling tread width (RTW); and a center zone (CZ) defined between said shoulder zones; wherein the tread region comprises a plurality of ribs (23) separated by grooves (22), said grooves running continuously from the center zone toward each of said tread edges at a groove angle relative to the lateral direction and extending out to the respective tread edge; and wherein a shoulder zone average groove angle is greater than 45 in absolute value; the shoulder zone average groove angle is greater than a center zone average groove angle in absolute values; and the grooves are running toward the tread edges

Tire (1) for an agricultural vehicle and more particularly to the tread (2) thereof. The tread has a radial thickness H.sub.max and comprises a middle part (20) and two lateral parts (21, 22), the meridian profile (P.sub.S) of the radially outer surface (31, 32) of each lateral part (21, 22) is radially on the inside of the meridian profile (P.sub.C) of the radially outer surface (30) of the middle part (20) and the radial distance (d) between the midpoint (I.sub.1, I.sub.2) of the meridian profile (P.sub.S) of the radially outer surface (31, 32) of each lateral part (21, 22) and the meridian profile (P.sub.C) of the radially outer surface (30) of the middle part (20) is at least equal to 0.5 times the radial thickness H.sub.max of the tread (2).

The tread pattern of a tire for a vehicle for agricultural use comprises two rows of lugs (R1, R2), a first row being made up of a circumferential distribution of at least two families of lugs, over one revolution of the wheel; a first family is reproduced with a shortest spacing S, and a second family is reproduced with a longest spacing L; the tread pattern of the tread is designed such that the distance between the axially outer end of a following lug and the axially inner end at the centre of the tread is referred to as the overlap distance R. The ratio of the shortest spacing S of the family of lugs to the longest spacing L, S/L, lies in the range [0.6; 0.8]. The circumferential overlap distance R between the first and second circumferential rows of lugs is constant around the entire circumference of the tire.

A pneumatic tire, includes: an annular-shape tread portion; a sidewall portions; and bead portions. JIS hardness of tread rubber is within a range of 40 to 60 and snow traction index is 180 or higher. A rib positioned between circumferential grooves is demarcated in a center region of the tread portion. Closed grooves are formed in the rib. The closed grooves are inclined with regard to a tire axial direction such that a closed end faces a leading side. A groove wall of the closed groove on the leading side protrudes more outward in the tire axial direction than a groove wall on a trailing side. A difference between angles ?1 and ?2 of the groove walls on the leading and trailing sides of the closed grooves, respectively, with regard to the tire axial direction is within a range of 0???1-?2?5?.

Tread (10) for agricultural tire (1) comprising a plurality of lugs protruding from the ground of the tread (11) in radially outer direction extending at a given inclination angle from a central portion of the tread toward both axial ends of the tread and alternately arranged at given intervals in the circumferential direction on one side and on the other with respect to the equatorial plane of the tire. The lugs (2) comprising a stepping-in surface (21) wherein the stepping-in surface (21) of at least one lug (2) comprises on its sidewall a first radially outer, concave surface (211) and a second, radially inner, concave surface (212) intersecting each other in a transition point (D) when viewed in a circumferential section.

A pneumatic vehicle tire including a utility vehicle tire has a tread with profile positives which are separated from one another in a circumferential direction by transverse channels which extend continuously from the central region of the tread as far as the lateral tread edges, respectively. The transverse channels are main channels of the tread and, at least over the major part of the course thereof, have the maximum provided profile depth. The transverse channels are provided, on the respective channel base thereof, with a row of base elevations formed so as to be distributed over the entire course of the transverse channels. The base elevations are attached to the channel flanks of the transverse channels and are configured such that their rubber volume becomes smaller the closer to the tread edge they are disposed.