Patent ID: 8176719

Claim:
A reinforcing cord for rubber reinforcement comprising: a fiber core; and a plurality of strands disposed around the fiber core, wherein the fiber core is formed of one or a plurality of highly elastic fibers having a tensile elastic modulus of at least 100 GPa, each of the plurality of the strands is formed of a plurality of glass fibers that are primarily twisted, and the plurality of the strands are finally twisted to be disposed around the fiber core, a direction of the final twist of the plurality of the strands is opposite to a direction of the primary twist in each of the plurality of the strands, and a number of the final twists of the plurality of the strands is 1.0 to 3.0 times/25 mm, and a ratio of a number of the primary twists in each of the plurality of the strands to the number of the final twists of the plurality of the strands (the number of the primary twists/the number of the final twists) is in a range of 1.5 to 2.5.