Abstract: A pneumatic radial tire for motorcycle comprises a belt containing cords extended substantially in a circumferential direction of a tread and has a directional tread pattern defined by plural main slant grooves having a given inclination angle with respect to the circumferential direction and extending from a tread center up to a tread shoulder region and a slant sub-groove arranged between the slant main grooves and having an inclination angle smaller than that of the slant main groove, in which the slant main groove has a given width in connection with a periphery length between both ends of the tread at a particular posture under a given air pressure; a main portion of the slant sub-groove is terminated so as not to open into the slant main groove and has given groove width, length in the circumferential direction of the tread, and depth.

Abstract: A pneumatic tire (20) for small construction type vehicle has a leading edge projection (47, 67) extending from the lugs (40, 60) to provide a wear pad and pivot position for improved ride and durability performance.

Abstract: A pneumatic tire comprises: a tread portion provided with an asymmetric block pattern and having an inside tread edge and an outside tread edge to be placed on the inside and outside of a vehicle, respectively; outside lateral grooves extending from the outside tread edge to a tread center region, each having a groove center line X0 inclined towards one direction with respect to the tire circumferential direction at an angle &thgr;0 of from 40 to 60 degrees with respect to the tire circumferential direction; inside lateral grooves extending from the inside tread edge to the tread center region, each having a groove center line X5 inclined at an angle &thgr;5 of from 70 to 100 degrees with respect to the tire circumferential direction; each portion between the circumferentially adjacent outside lateral grooves being divided into outside blocks by first to fourth outside connecting grooves extending thereacross; the first outside connecting groove having a first groove center line X1 , the second outside connec

Abstract: A pneumatic tire for a two-wheeled vehicle having high lateral stiffness and exhibiting improved steering stability has a tread pattern defined in a tread portion by numerous sets of combination lug groove patterns. In this tread portion, one set of the left and right sides of the lug groove patterns is reverse W-shaped as a whole in the tire rolling direction, each of mid bending points P on both sides of the reverse W-shape is arranged at the region of 20-80% of a tire tread half width TW from a tire central circumferential line EC, an angle of the lug groove component to a tire shoulder portion from the mid bending point P is 20-70° with respect to a tire equatorial plane E, and an angle of the lug groove component to the tire central circumferential line EC from the bending point P is 20-70° with respect to the tire equatorial plane E.

Abstract: A pneumatic radial tire for passenger car has a directional tread pattern comprising many blocks formed in a tread portion by a plurality of circumferential grooves extending in a circumferential direction of the tire and a plurality of directional slant grooves obliquely extending with respect to the circumferential direction, wherein at least a part of the directional slant grooves is branched from the circumferential groove near to the pattern center and extends toward and is opened at an end of a ground contact region of the tread, and at least a part of corner portions of each of the blocks forms an acute angle of 10-60° defined by the circumferential groove and the directional slant groove; and a surface of the corner portion of the block having an acute angle of 10-60° is beveled over a distance of 10-30 mm from a tapered end thereof in a longitudinal direction so as to gradually shallow from the tapered end toward a width widened portion of the block in both stepping-in and kicking-out sides o

Abstract: At a portion of an inclined main groove from a tread center to an auxiliary groove of a pneumatic tire, an angle of inclination &thgr;1 of a groove wall surface at a block step-in end side is set to be smaller than an angle of inclination &thgr;2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of step-in ends of blocks defined by inclined main grooves is lowered such that a striking sound can be reduced. Further, at a portion of the inclined main groove from the auxiliary groove to a tread end, an angle of inclination &thgr;1 of a groove wall surface at a block step-in end side is set to be greater than an angle of inclination &thgr;2 of a groove wall surface at a block kick-out end side. Therefore, rigidity of kick-out end sides of blocks defined by the inclined main grooves is lowered. Heel-and-toe wear which occurs at the kick-out end sides is suppressed, and an increase in pattern noise caused by heel-and-toe wear is suppressed.

Abstract: A tire tread band for medium/heavy duty motor-vehicles having circumferential grooves confining three pairs of respectively center, intermediate and shoulder ribs. Respective tread blocks are defined along the center and intermediate ribs and they are confined by transverse cuts. The center cuts impart a cusp-shaped end conformation and a hollow-shaped end conformation to the respective blocks, and the shapes of said end portions mutually match. The intermediate cuts run in the linear extension of the center cuts to give the respective blocks a rhomboidal configuration. The tire can be alternately associated with a driving axle or a driven axle, by merely reversing its direction of rotation, so that the following results are selectively achieved: an increase in the traction capability by the intermediate blocks or an increase in the directional capability as a result of the mutual wedging between the center blocks at the ground-contacting area.

Abstract: A pneumatic tire comprises a tread with a plurality of sipes, in which one of opposed wall faces of the sipe is a concave face arc-shapedly curved over a whole of the sipe in a depth direction thereof and the other wall face thereof is a convex face just fitted to the above concave face, and a curvature of each of the concave and convex faces is substantially constant over a full length in a longitudinal direction of the sipe.

Abstract: A tire for a two-wheeled vehicle comprising a ground contacting tread having at least one tread groove formed therein and extending axially from the tread center to the tread edge, wherein in a first region of the tire tread, which is the central tread region and is the region of contact between the tire and the ground when the motorcycle is in the condition of moving in a straight line, the alignment of the tread groove is substantially circumferential, and in a second region of the tire tread, which is at the axial edge of the tread and is the region of contact when the motorcycle is in the condition of turning under maximum cornering, the alignment of the tread grooves is substantially transverse, and in a third region, which is the tread region between the first central region and the second axial region and which is the ground contacting region when the motorcycle is turning at less than the maximum cornering condition, the groove alignment changes progressively axially outwardly from substantially circu