A hybrid cord of at least two multifilament yarns twisted together is described, where the first yarn is a viscose multifilament yarn and the second yarn is a non-metallic multifilament yarn composed of a material that is not identical to the first multifilament yarn. The viscose multifilament yarn is conditioned in the standard climate in accordance with DIN EN ISO 139-1:2005, and has a yarn linear density <1100 dtex and a breaking tenacity of 45 cN/tex. The hybrid cord has a cord linear density of 3000 dtex.

Provided is a tire having improved strength through use of polyamide 4 fiber. The tire contains a fiber-rubber composite including polyamide 4 fiber that contains polyamide 4.

A tyre (1) for motorcycle wheels is described comprising a carcass structure (2), a belt structure (6) applied at a radially outer position with respect to the carcass structure (2), and a tread band (8) applied at a radially outer position with respect to the belt structure (6), wherein the carcass structure (2) comprises a carcass layer (2a) which comprises a plurality of reinforcing cords comprising one or more textile yarns comprising a plurality of textile filaments made of a material selected from rayon, PET, PEN, and PEEK, and/or hybrid reinforcing cords comprising a plurality of textile filaments made of a combination of two or more of rayon, PET, PEN, and PEEK, embedded in a vulcanized elastomeric material having a dynamic elastic modulus E measured at 70 C. and 100 Hz comprised between 5.0 and 9.0 MPa and a tandelta measured at 70 C. and 100 Hz comprised between 0.130 and 0.170. The vulcanized elastomeric material also comprises a white silica-based reinforcing filler and a residual unreacted amount of a silane coupling agent of the white silica-based reinforcing filler, expressed as an amount of silicon measured by ICP-OES, greater than or equal to 70 ppm.

The tire comprises a carcass ply connecting two beads via two sidewalls, the carcass ply being surmounted radially towards the outside of the tire by a crown reinforcing zone which is itself surmounted radially towards the outside of the tire by a tread, the crown reinforcing zone comprising a plurality of reinforcing strips arranged over at least one ply of strips. The strips are arranged so that they are juxtaposed and at an angle less than or equal to 15 with respect to the circumferential direction. Each reinforcing strip is made up of a laminate of at least 3 composite layers, each composite layer containing oriented fibers having a tensile modulus greater than or equal to 55 GPa, which are parallel to one another and coated in a polymer matrix.