A brake disc for motorcycles; comprising: a brake track which has radial legs on the inner contour thereof; a core which has radial recesses on the outer contour thereof wherein respective end portions of the legs of the brake track are housed and; means for anchoring the brake track to the core of the disc; wherein: - the legs of the track and the peripheral portion of the core, which carries the recesses are arranged in a coplanar manner; - said legs comprise a circular hole that forms mounting points of the anchoring means; - said anchoring means comprise: - pins provided with: a head which acts against a first face of the corresponding leg of the brake track and of the core, and a through rod mounted through the hole in the corresponding leg and the end of which protrudes through a second face opposite from said leg; and wherein the legs of the track and the peripheral portion of the core have the same thickness; and in that said anchoring means further comprise: - a spring mounted on the protruding end of the pin and which exerts a pressure against the second face of the corresponding leg and of the core, and maintains them in a coplanar manner, and - a retaining element of the spring in the mounting position on the rod of the pin; characterised in that the legs of the brake track have a uniform width, slightly less than that of the recesses in the core and are partially housed in said recesses, the end of said legs being spaced from the bottom of the corresponding recesses to an extent suitable for enabling the expansion of said legs towards the centre of the disc, if the brake track heats up. - the legs of the track and the peripheral portion of the core, which carries the recesses are arranged in a coplanar manner; - said legs comprise a circular hole that forms mounting points of the anchoring means; - said anchoring means comprise: - pins provided with: a head which acts against a first face of the corresponding leg of the brake track and of the core, and a through rod mounted through the hole in the corresponding leg and the end of which protrudes through a second face opposite from said leg; and wherein the legs of the track and the peripheral portion of the core have the same thickness; and in that said anchoring means further comprise: - a spring mounted on the protruding end of the pin and which exerts a pressure against the second face of the corresponding leg and of the core, and maintains them in a coplanar manner, and - a retaining element of the spring in the mounting position on the rod of the pin; characterised in that the legs of the brake track have a uniform width, slightly less than that of the recesses in the core and are partially housed in said recesses, the end of said legs being spaced from the bottom of the corresponding recesses to an extent suitable for enabling the expansion of said legs towards the centre of the disc, if the brake track heats up. - pins provided with: a head which acts against a first face of the corresponding leg of the brake track and of the core, and a through rod mounted through the hole in the corresponding leg and the end of which protrudes through a second face opposite from said leg; - a spring mounted on the protruding end of the pin and which exerts a pressure against the second face of the corresponding leg and of the core, and maintains them in a coplanar manner, and - a retaining element of the spring in the mounting position on the rod of the pin;