Tyre (100) for wheels of vehicles, comprising a belt structure (106) comprising a radially outer circumferential belt layer (106c) of the belt structure comprising a plurality of hybrid reinforcement cords arranged according to a substantially zero angle with respect to the equatorial plane (X-X) of the tyre, each of said hybrid reinforcement cords being formed by two aromatic polyamide fibre yarns and by a polyester and/or aliphatic polyamide fibre yam wherein each of the aromatic polyamide fibre yarns has a linear density less than or equal to about 1500 dTex and an initial modulus equal to or greater than about 6000 cN/tex measured in accordance with the BISFA standard-Testing methods for para-aramid fibre yarns, 2002 edition.