Abstract: A pneumatic tire has a tread part with two wide circumferential grooves having a width GW of 35 mm or more and extending in either side of the tire's equator so as to divide the tread part into a pair of shoulder parts and a central part. The central part has a surface utilizing successive convex curves of a pair of inner groove walls and a central ground-contacting surface. When the tire is mounted on a regular rim, inflated with regular internal pressure and applied with normal load, widths SW1, SW2 of shoulder ground-contacting areas Fs1, Fs2 where the shoulder parts contact with the ground are different to each other.

Abstract: Improved tires designed for use in an improved tire/vehicle system having two pneumatic front tires and two pneumatic rear tires are especially effective when utilized on vehicles with a suspension system having limited camber, as in a live axle suspension system. The tires include a support member which is molded to the inboard sidewall of one or more tires in the tire/vehicle system. The inboard sidewall of a tire provides improved lateral stiffness in the tire, for cornering, and functions similar to cambering in tire/vehicle systems where cambering is not possible or where camber adjustment is limited.

Abstract: The present invention relates to the field of tires having reinforced sidlls. In order to improve the high-speed performance of a tire and reduce the extent of vibration of the sidewalls (1) and effectively transmit a torque from the wheel to the ground via the tire, the rigidity of the sidewalls of the tire is adjusted by the provision of reinforcements (6) in the form of assembly sections oriented in circumferential direction. Said assembly sections are of short length as compared with the development of the tire measured at the point S of the tire which is located furthest radially to the outside.

Abstract: The invention is directed to a pneumatic tire that can be mounted on a rim (wheel) to assure good engagement with the rim while preventing the occurrence of rim offsets. The bead portion 4a (as indicated by a solid line in FIG. 1) on the front side of a tire 1 which is later mounted on the rim has a bead base diameter .phi..sub.1, a toe portion angle .phi..sub.1, a contact angle .alpha..sub.1 , and a heel portion radius R.sub.1, whereas the bead portion 4b (as indicated by a dashed line in FIG. 1) on the back side of the tire which is first mounted on the rim has a bead base diameter .phi..sub.2, a toe portion angle .theta..sub.2, a contact angle .alpha..sub.2 and a heel portion radius R.sub.2. The bead portion 4a on the front side has a different shape than the bead portion 4b on the back side and the following two relationships hold between the two bead portions; the angle of .theta..sub.2 of the toe portion on the back side should be greater than the angle .theta..sub.

Abstract: A pneumatic tire to be fitted on a wheel wherein a position, in which a disc is connected to a rim, is offset from the cneter of width of the rim toward the outer surface of the wheel, characterized in that a ratio (Ho/Hi) of an attenuation coefficient Ho (=Go.times.tan.delta.o) determined on the basis of an average thickness Go of an outer side wall of the tire on the outer side of the wheel and a loss factor tan.delta.o of the rubber of this side wall to that Hi (=Gi.times.tan.delta.i) determined on the basis of an average thickness Gi of an inner side wall of the tire on the inner side of the wheel and a loss factor tan.delta.i of the rubber of this side wall is set in the range of 1.2-6.5.

Abstract: A pneumatic tire having two different bead diameters has handling, ride and treadwear advantages. The tire is made so that the rho.sub.m of the longer sidewall and the rho.sub.m of the shorter sidewall are equal. The rho.sub.m of the longer sidewall is made equal to the rho.sub.m of the shorter sidewall by establishing a belt profile wherein the amount of drop at a belt edge is specified to give a mold drop of 0.30 to 0.33 of estimated tire deflection, applying an inflated shape prediction formula to calculate the inflated belt profile and varying the value of rho.sub.m until the drop at the end of the belt closely matches a specified value, using the cosine law to specify the change in belt angle with radius, choosing a shoulder point under the belt edge that allows a 0.050 inch wedge between the bottom of the belt and the top of the carcass ply and varying the slope of the ply at the shoulder point until the inflated ply line passes through the Y-max location at rho.sub.m.

Abstract: A pneumatic tire having improved high-speed running performances is manufactured by conducting vulcanization of a green tire with a mold provided at a position corresponding to a given position between neighborhood of shoulder portion and neighborhood of bead portion with at least one protrusion which protrudes inside the mold and continuously extends in the circumferential direction of the mold and consists of a first arc segment having a center of curvature located outside from the inner surface of the mold and second arc segments each having a center of curvature located inside from the inner surface of the mold and smoothly connecting to the first arc segment at upper and lower ends in the radial direction of the mold.

Abstract: A heavy duty pneumatic tire comprises a tread, two side walls, two beads, a radial carcass reinforcement, and a belt composed of at least two plies of which cords are intersected in the adjacent plies. The radius of curvature of the contour of the tread appearing in a tire cross section including a tire rotary axis is asymmetrical with respect to the tire equatorial plane. A larger radius of curvature is given to the tread portion to be located outside when the tire is mounted to a wheel, while a smaller radius of curvature is given to the tread portion to be located on the inner side when the tire is mounted to the wheel. The difference between the larger radius of curvature and the smaller radius of curvature is not less than 70 mm. The rigidity of the tread is larger on the tread portion having the larger radius of curvature than on the tread portion having the smaller radius of curvature.

Abstract: The present invention concerns a tire for vehicle wheels, intended for being used for sports events and for high performance, that is capable of guaranteeing, under any running conditions--of time, as well as of the road, the best road-behaviour characteristics.The tire of the invention presents a tread pattern that is axially subdivided into two circumferential adjacent sections--of blocks and grooves respectively, and a tread-band--comprised by two circumferential portions that are axially adjacent--made from diverse elastomeric compositions and having a diverse thickness, where the line of separation--between the two sections of the pattern, does not coincide with the line of separation between the two portions made of elastomeric compositions.The said tread-band, is supported by a mixed textile/metallic breaker structure, having an asymmetrical profile--with respect to the equatorial plane of the tire.

Abstract: A pneumatic radial tires having a tread of an asymmetrical profile are disclosed. A circumferential location at which a tread takes its maximum outer diameter is deviated from a tire equator outwardly opposite to a side on which the tire is to be mounted to a vehicle, by a distance L equal to a range from 0.05 to 0.30 times as long as a width W of the tread. A ratio of d.sub.2 /d.sub.1 is set at a range from 0.98 to 1.00 in which d.sub.1 and d.sub.2 are diameters of shoulders of the tread on the mounted tire outer side and mounted tire inner side, respectively. The tires are free from uneven wear such as shoulder drop uneven wear, river wear and one side wear.

Abstract: Heavy duty pneumatic tires having lug grooves at a tire tread surface are disclosed, wherein a width of a tread portion from a tire equator to one of tread edges which tread portion is to be located on a wheel-mounted outer side is larger than that of the other tread portion from the equator to the other tread edge. When contours of the tread portions located on the opposite sides of the tire equator are approximated by two respective circular arcs, the radius of curvature of the wider tread portion is larger than that of the narrower tread portion. A depth of grooves at the shoulder portion on the wider tread portion which depth is expressed by a distance between the tread edge and the bottom of the lug grooves is made smaller than that of the narrower tread portion.

Abstract: A pneumatic radial tire wherein with respect to a central plane of a wheel in a transversely sectional plane containing a rotary axis of the tire, a carcass and a reinforcing belt layer have respectively symmetrical contour profiles and a tread portion has an asymmetrical contour profile. The contour of the tread within the transverse sectional plane satisfies the following relations:the maximum outer diameter point is positioned at a place axially apart from the central plane of the wheel and a distance between the maximum outer diameter point and the central plane of the wheel is not less than 1/10 times the maximum width of the tire;when contours of portions of the tread located on opposite sides of the maximum outer diameter point are approximated by respectively two arches, the radius of curvature, R.sub.2, of the narrower section is larger than the radius of curvature, R.sub.

Abstract: An automobile tire having retractable tread studs for increasing traction of the tire on slippery surfaces which are actuated by air pressure that is controlled by the automobile driver from the driver's seat.