The tire includes a tread portion 2 having at least one groove 3 that includes two groove walls 6. At least one of the groove walls 6 has a protrusion 10 that protrudes from the groove wall 6. The protrusion 10 includes at least two ribs 11 that extend in a length direction of the groove 3 and are spaced from each other in the tire radial direction, and a joining portion 12 for joining the ribs 11 to each other. Each rib 11 protrudes from the groove wall 6 so as to form such an inclination that the rib 11 is inclined outward from the groove wall 6 in a tire radial direction.

A vulcanization mold is a mold including blades having a distal end side thick portion and pullout is performed smoothly by the mold without causing any failure, and a pneumatic tire. A vulcanization mold in which a blade or has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the blade proximal end portion and the blade distal end side thick portion to each other is a vulcanization mold in which a blade density that is a number of blades implanted on a sector mold per unit length in a circumferential direction is lower at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.

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.

Provided is a thin film with good durability that is easy to handle during storage and use. The film contains, as a rubber component, at least a copolymer having a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit, and having a proportion of a butylene unit of 0 mol %, where a filler content is 15 parts by mass or less with respect to 100 parts by mass of the rubber component, no cross-linking agent is contained, and the thickness is 300 μm or less.

In a pneumatic tire, high and low blocks with different heights are provided in a side region. High and low blocks adjacent in a circumferential direction form a block pair. The high and low blocks in the block pair are partially in contact with each other. A side groove between these blocks is a closed groove. In each block pair, contour lines including first, second and third linear portions, define edges on both sides in the tire circumferential direction, of a top surface of each of the high and low blocks. The first linear portions and one of the second linear portions or the third linear portions extend in an identical direction with an angle difference being equal to or smaller than 15 degrees. Other linear portions of the second linear portions or the third linear portions extend in different directions.

Provided is a pneumatic tire capable of providing improved steering stability performance on dry road surfaces and improved steering stability performance on wet road surfaces in a compatible manner. A chamfered portion (12A, 12B) and a non-chamfered portion (13A, 13B) are provided in each of an edge (11A) on a leading side and an edge (11B) on a trailing side of a sipe (11). In a meridian cross-sectional view, a profile line (PL1) of a rib (10) projects further to an outer side in a tire radial direction than a reference tread profile line (PL0). A radius of curvature TR (mm) of the reference tread profile line (PL0) and a radius of curvature RR (mm) of the profile line (PL1) satisfy a relationship of TR>RR. Only one of the chamfered portions (12A, 12B) on the leading side and the trailing side is disposed so as to straddle a maximum projection position (P). A maximum projection amount D (mm) of the rib (10) with respect to the reference tread profile line (PL0) and a maximum width (W) (mm) of the chamfered portion (12A, 12B) satisfy a relationship of 0.05 mm.sup.2<W×D<1.50 mm.sup.2.

A motorcycle tire having improved water draining capacity and achieving both excellent dry and wet performance. A motorcycle tire including an annularly formed tread; in which the tread has main grooves; and in which at least one main groove of the main grooves has two or more widened portions that are enlarged outward in the groove width direction in at least one of the groove wall on the first grounding side in the rotational direction and the groove wall on the later grounding side in the rotational direction.

A method is disclosed for analyzing the rolling of a rotating body that will make it possible to simultaneously achieve reduction in computational cost and attainment of adequate analytic precision. The method includes: a step (S100, S101) in which a structural model is acquired; a step (S103) in, which a region Ar1 on a rotating body T at which finely divided computational mesh cells are established is made to come in contact with the ground, and rolling analysis processing is performed in which rolling is made to occur in an amount that is an angle corresponding to N minimum units (where N is a natural number not less than 1); and a step (S105) in which mapping processing is performed in which physical quantities at computational mesh cells as they exist following the rolling analysis processing are copied to corresponding computational mesh cells at a rolling start time.

The present application relates to a high grip snow tire, which belongs to a field of snow tire, including a carcass. The carcass is provided with pattern blocks and friction blocks on the circumferential surface thereof, which are positioned on the same side with the equatorial plane of the carcass. The pattern blocks and the friction blocks are successively distributed along the circumference of the carcass, and are in mirror symmetry about the equatorial plane. The friction block includes a plurality of fixing protrusions, which are gradually sharp along the direction away from the carcass. The carcass is provided with a protection groove on the surface thereof, and the fixing protrusions are positioned in the protection groove. The present application has the effect of improving the grip.

A tire includes a tread portion provided with a tread profile which is curved in an arcuate shape in a tire meridian section so that the tread portion includes a crown region contacting with the ground during straight running, and a pair of shoulder regions contacting with the ground during cornering by leaning the tire at a certain camber angle. The crown region has a land ratio of not less than 98%, and the shoulder regions have a land ratio of from 85% to 93%. A three-wheeled vehicle has a pair of front wheels and a single rear wheel on which the tire is mounted.