Process for producing tyres comprising: - building a green tyre comprising two bead structures, each comprising a bead filler and annular anchoring structures, - subjecting the green tyre to moulding and cross-linking in order to obtain a finished tyre; wherein at least one rigid component of said green tyre selected from among said bead filler, a coating of said annular anchoring structures, an anti-abrasive strip and a sidewall insert, comprises a final elastomeric compound comprising at least one elastomeric polymer, at least one reinforcement filler, components capable of facilitating the cross-linking, and at least 5 phr of hardening resin; and wherein said final elastomeric compound is produced by: - feeding at least the elastomeric polymer and the reinforcement filler to a first batch mixing device; - mixing and dispersing, in said first batch mixing device, said reinforcement filler in said elastomeric polymer, in a manner so as to obtain a first-phase elastomeric compound; - unloading said first-phase elastomeric compound from said first batch mixing device; - feeding said first-phase elastomeric compound, along with in addition at least 5 phr of said hardening resin, to a continuous mixing device, said continuous mixing device being of intermeshing and co-rotating twin-screw or multi-screw type, or of planetary type, and - mixing and dispersing, in said continuous mixing device, said hardening resin in said first-phase elastomeric compound, in a manner so as to obtain an intermediate elastomeric compound, said mixing in said continuous mixing device being executed at a speed of screws or of central rotor from 40 revolutions per minute to 400 revolutions per minute; - unloading said intermediate elastomeric compound from said continuous mixing device, - feeding said intermediate elastomeric compound along with in addition components capable of facilitating the cross-linking to a second batch mixing device, wherein said components capable of facilitating the cross-linking comprise vulcanising agents and/or accelerant agents; - mixing, in said second batch mixing device, said components capable of facilitating the cross-linking in said intermediate elastomeric compound, in a manner so as to obtain said final elastomeric compound, wherein each of said first and second batch mixing device has two counter-rotating rotors and the mixing in said batch mixing devices is executed at a rotor speed from 5 revolutions per minute to 80 revolutions per minute; - unloading said final elastomeric compound from said second batch mixing device. - building a green tyre comprising two bead structures, each comprising a bead filler and annular anchoring structures, - subjecting the green tyre to moulding and cross-linking in order to obtain a finished tyre; - feeding at least the elastomeric polymer and the reinforcement filler to a first batch mixing device; - mixing and dispersing, in said first batch mixing device, said reinforcement filler in said elastomeric polymer, in a manner so as to obtain a first-phase elastomeric compound; - unloading said first-phase elastomeric compound from said first batch mixing device; - feeding said first-phase elastomeric compound, along with in addition at least 5 phr of said hardening resin, to a continuous mixing device, said continuous mixing device being of intermeshing and co-rotating twin-screw or multi-screw type, or of planetary type, and - mixing and dispersing, in said continuous mixing device, said hardening resin in said first-phase elastomeric compound, in a manner so as to obtain an intermediate elastomeric compound, said mixing in said continuous mixing device being executed at a speed of screws or of central rotor from 40 revolutions per minute to 400 revolutions per minute; - unloading said intermediate elastomeric compound from said continuous mixing device, - feeding said intermediate elastomeric compound along with in addition components capable of facilitating the cross-linking to a second batch mixing device, wherein said components capable of facilitating the cross-linking comprise vulcanising agents and/or accelerant agents; - mixing, in said second batch mixing device, said components capable of facilitating the cross-linking in said intermediate elastomeric compound, in a manner so as to obtain said final elastomeric compound, wherein each of said first and second batch mixing device has two counter-rotating rotors and the mixing in said batch mixing devices is executed at a rotor speed from 5 revolutions per minute to 80 revolutions per minute; - unloading said final elastomeric compound from said second batch mixing device.