Abstract: A bicycle tire which has a raised, circumferential center rib and laterally opening grooves of scalene trapezoidal shape alternatively in the right and left sides of the center rib whereby the center rib defines a zigzag shape. Groups of polygonal, raised blocks are spaced from both sides of said center rib along the entire periphery of the tire. The bicycle tire provides an improved ride on level and uneven ground or roadways. The tire provides the advantages of both line and block pattern tread types in a single overall tread design.

Abstract: An improved bicycle tire which can be folded for storage and transportation while maintaining the same running properties as a conventional tire. A plurality of bead cores made of a cord tensile member embedded in the bead section of the tire are provided by winding three to five turns of a cord tensile member having a low elongation ratio and high strength and which has been twisted one to two turns/10 cm in such a manner that the start and finish ends of the bead core overlap one another by 60 to 150 mm. The bead core preferably has a cut elongation of 5% or less and the strength of 300 kg/core.

Abstract: An improved bicycle tire which can be folded for storage and transportation while maintaining the same running properties as a conventional tire. A plurality of bead cores made of a cord tensile member embedded in the bead section of the tire are provided by winding three to five turns of a cord tensile member having a low elongation ratio and high strength and which has been twisted one to two turns/10 cm in such a manner that the start and finish ends of the bead core overlap one another by 60 to 150 mm. The bead core preferably has a cut elongation of 5% or less and the strength of 300 kg/core.

Abstract: A rubber composition and a process for the preparation of rubber compositions comprising, in the presence of a metal oxide, vulcanizing, or vulcanizing after blending with another unsaturated rubber, of the reaction product of (1) an unsaturated rubber, sulfur and a sulfur cleaving agent, (2) an unsaturated rubber and a mercaptan compound, (3) a halogenated unsaturated rubber and a metal salt of a sulfur cleaving agent, or (4) an unsaturated rubber, a sulfur cleaving agent and a compound having a functional group such as a nitrile oxide, a nitroso or a thionylamine.

Abstract: A rubber composition and a process for the preparation of rubber compositions comprising, in the presence of a metal oxide, vulcanizing, or vulcanizing after blending with another unsaturated rubber, of the reaction product of (1) an unsaturated rubber, sulfur and a sulfur cleaving agent, (2) an unsaturated rubber and a mercaptan compound, (3) a halogenated unsaturated rubber and a metal salt of a sulfur cleaving agent, or (4) an unsaturated rubber, a sulfur cleaving agent and a compound having a functional group such as a nitrile oxide, a nitroso or a thionylamine.