Sumitomo Rubber Industries Limited

Nigel G Nock

David Robert Watkins

Michael Jackson

David H Clarke

Arthur R Williams

John Martin

A motorcycle tire having in its normally inflated condition a camber value C/L of between 0.5 and 0.7 and having a maximum axial width between edges of a ground contacting tread wherein in axial cross-section the tread comprises two tread rubber components of different rubber compounds joined by a scarf joint, the scarf joint having a width less than the width of the tread and having an intertread ply comprising reinforcing cords interposed between the two tread rubber components.

Motorcycle tire

A motorcycle tire comprises a tread reinforced between its edges by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 to 0.7, a reinforcing carcass ply of rubber covered cords radially inside the breaker assembly and extending between two bead regions and wrapped in each bead region around an annular bead core to form carcass ply turn-ups, and tire sidewalls between the tread edges and bead regions, wherein under the tread is disposed radially inward of the breaker assembly a secondary carcass ply of rubber covered cords and between the carcass ply and the secondary carcass ply is disposed a rubber member extending from tread edge to tread edge.

Motorcycle radial tire with rubber member between carcass plies

A motorcycle radial tire comprises a tread reinforced between its edges by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 and 0.7, a reinforcing carcass of radially disposed cords extending radially inside the breaker assembly and between two bead regions and wrapped in each bead region around an annular bead core from the axial inside to the outside to form carcass ply turn-ups, and tire sidewalls between the tread edges and bead regions, the tire characterized in that the breaker assembly comprises two breaker plies each reinforced with aromatic polyamide cords oppositely inclined with respect to the circumferential direction of the tire and a supplementary ply disposed radially adjacent to the breaker plies and reinforced with nylon reinforcements laid parallel to each other and disposed at an angle in the range of 75.degree.-90.degree. to the circumferential direction of the tire.

Motorcycle radial tire with supplementary breaker fly

A pneumatic tire for a vehicle comprises a carcass ply extending between two bead regions and passing through a tread region which extends between two tread contact edges, a tread region reinforcing breaker radially outwards of the carcass in the tread region and a ground contacting tread surface curved in the axial direction wherein the curvature of the outer tread surface when the tire is mounted on its design wheel rim and normally inflated has a continuously decreasing radius from a point P which is at a distance SP in the axial direction from the tire circumferential center line equal to 20% of the distance from the tread center to the adjacent tread contact edge.

Pneumatic tire with specified tread curvature and/or specified breaker

A pneumatic tire for a vehicle comprises a carcass ply extending between two bead regions and passing through a tread region which extends between two tread contact edges, a tread region reinforcing breaker radially outwards of the carcass in the tread region and a ground contacting tread surface curved in the axial direction wherein the outer surface of the widest breaker ply when the tire is mounted in its design wheel rim and normally inflated has a curved shape in the tire axial direction and has a continuously decreasing radius from a point B to the adjacent edge of the breaker wherein point B is at a distance SP in the axial direction from the tire circumferential centerline equal to 20% of the distance from the tread center to the adjacent tread contact edge.

Motorcycle radial tire with supplementary breaker ply

A tire tread pattern comprising a central zone and two edge zones in which the edge zones are subdivided circumferentially of the tire by a series of transverse grooves each having an axially outer end open to the tread edge characterized by in each transverse groove a noise baffle comprising a circumferentially extending rib across the groove and having a height of 25% to 75% of the groove depth. The noise baffle is preferably quite narro so that it does not materially affect the stiffness of the blocks but acts as a noise baffle only. It may be a single baffle or two or more short baffles interlocking to block noise transmission.

Growing community of inventors

Sutton Coldfield, United Kingdom

Nigel G Nock