Abstract: A reinforcing element includes a single strand of high-modulus textile monofilaments and a single strand of low-modulus textile monofilaments. The strand of high-modulus textile monofilaments and the strand of low-modulus textile monofilaments are wound around each other in a direction D3 with a twist R3. The strand of high-modulus textile monofilaments has a residual twist R1 in a direction D1. The strand of low-modulus textile monofilaments has a residual twist R2 in a direction D2. The residual twists R1 and R2 have a relationship such that: when R2 is substantially non-zero, R1>R2, and when R2 is substantially zero, R1 is substantially non-zero.

Abstract: The reinforcing element (45) comprises an assembly (49) made up: of a multifilament strand made of aromatic polyamide or aromatic copolyamide (46) and of a multifilament strand made of polyester (48). The two strands (46, 48) are wound in a helix around one another, and the reinforcing element (45) is twist-balanced. The twist factor K of the reinforcing element (45) ranges from 5.5 to 6.5 where K is defined by the formula: K=(R×Ti1/2)/957 in which R is the twist of the reinforcing element (45) expressed in twists per metre and Ti is the sum of the counts of the multifilament strands of the reinforcing element (45) in tex.

Abstract: The reinforcing element (36) comprises a single strand (54) of high-modulus textile monofilaments and a single strand (56) of low-modulus textile monofilaments which are wound one around the other in a direction D3 with a twist R3, the strand (54) of high-modulus textile monofilaments having a residual twist R1 in the direction D1, the strand (56) of low-modulus textile monofilaments having a residual twist R2 in the direction D2, the residual twists R1 and R2 being such that: R1>R2 when R2 is substantially non-zero R1 is substantially non-zero when R2 is substantially zero.

Abstract: The run-flat tyre (P1) comprises a carcass reinforcement (32) comprising at least one polyester reinforcing element and a sidewall insert (44) manufactured from a rubber composition based on a crosslinkable rubber composition comprising an elastomer consisting of polybutadiene having a Mooney plasticity within a range of values extending from 55 to 85 Mooney units and a carbon black having a specific surface area within a range of values extending from 15 m2/g to 25 m2/g and an oil adsorption number of compressed sample within a range of values extending from 65 ml/100 g to 85 ml/100 g.

Abstract: A tyre, which is designed to be able to run flat, includes a carcass reinforcement. The carcass reinforcement includes at least one reinforcing element. Each reinforcing element includes at least one multifilament plied strand made of aramid and at least one multifilament plied strand made of polyester. The at least one multifilament plied strand made of aramid and the at least one multifilament plied strand made of polyester are twisted together.