Sumitomo Rubber Industries Limited

Yutaka Ichiryu

Masafumi Otani

Kazuki Fukushima

Yumiko Yoshida

Naoki Yukawa

Yukishige Adachi

A motorcycle tire includes a tread portion including a crown portion that is a region of 50% of a tread development width centered on a tire equator, a first shoulder portion that is an outer region of the crown portion, and first lateral grooves. Each lateral groove includes a first groove portion in the crown portion, a second groove portion in the first shoulder portion, and a third groove portion connecting the first and second groove portions. A groove depth and a groove width of the third groove portion are respectively smaller than groove depths and groove widths of the first groove portion and the second groove portion, respectively. More than 80% of a tire axial length of the third groove portion is in the first shoulder portion.

Motorcycle tire

Tire for motorcycle

A pneumatic radial tyre includes a plurality of shoulder lateral grooves crossing shoulder lard regions. In a cross-sectional view of at least one of the shoulder lateral grooves taken along a groove width center line thereof, a groove bottom of the shoulder lateral groove includes a first bottom surface portion arranged on an inner side in a tyre axial direction and a second bottom surface portion extending between the first bottom surface portion and the tread surface outer end in a concave arc shape having a radius of curvature.

Pneumatic radial tyre

A tirefor a motorcycle comprises a tread portionprovided on an inner surfaceSi thereof with a sealant layerfor preventing puncture. In each half of a cross-sectional view of the tire, when the tread portionis virtually divided into a center regionC, a middle regionM, and a shoulder regionS, a thickness tm of the sealant layerin the middle regionM is larger than a thickness tc of the sealant layerin the center regionC.

Tire for a motorcycle

The pneumatic tirefor a motorcycle comprises a tread portioncomprising a belt layer, an inner liner layermade of air impermeable rubber and arranged radially inside the belt layer, and a sealant layerattached to a radially inner surface () of the inner liner layer. The sealant layercomprises a crown portionA arranged at a center thereof in a tire axial direction and a pair of shoulder portionsB arranged on both sides of the crown portionA in the tire axial direction. Viscosity &#x3bc;of the shoulder portionsB is larger than viscosity &#x3bc;of the crown portionA.

Pneumatic tire for a motorcycle

A pneumatic tire excellent in high speed stability and turning ability is provided. In a band of a tire, a center portion located in an axial center has a helically wound structure in which a first band body including a first cord is wound. A shoulder portion located on an axial outside of the center portion has a meshed structure formed by a second band body including a second cord. The shoulder portion includes a plurality of first portions, a plurality of second portions and a plurality of third portions. Each first portion is inclined and extends from an axially inner end of the shoulder portion to an axially outer end of the shoulder portion. Each second portion is inclined in an opposite direction from the first portion and extends from the axially inner end of the shoulder portion to the axially outer end of the shoulder portion.

Pneumatic tire and method for manufacturing pneumatic tire

The purpose of the present invention is to provide a motorcycle tire for uneven ground travel for which the sticking of dirt to block grooves can be effectively prevented. Provided is a motorcycle tire for uneven ground travel in which a tread portion has a block pattern in which a plurality of blocks are provided. The blocks include, at the tread surface, at least one grooved block which has a block groove which is substantially C-shaped in plan view. The block groove has a pair of first groove portions that mutually extend in the same direction from the edge of the tread surface, and a second groove portion that links the first groove portions. The groove width Wof the second groove portion is larger than the groove width Wof the first groove portions, or the groove depth dof the second groove portion is larger than the groove depth dof the first groove portions.

Motorcycle tire for uneven ground travel

To provide a motorized two-wheeled vehicle tire for traveling on uneven terrain, the block durability performance of which has been improved; and a tire vulcanization mold capable of molding said tire. A motorized two-wheeled vehicle tire for traveling on uneven terrain wherein multiple blocks are provided on the tread at intervals in the tire circumference direction. Recesses are provided on the bottom surfaces of the grooves. Multiple recesses are provided at intervals in the axial direction of the tire. Spew, which was drawn up into the vent holes of the mold during vulcanization molding, or removal marks thereof are provided between each recess and the block that is adjacent in the tire circumference direction.

Growing community of inventors

Kobe, Japan

Yutaka Ichiryu