A braking band of a disc for brake disc comprising: - a body having a pre-established rotation axis (a), said body having an extension in the axial and radial directions in relation to said rotation axis; - said body being restrained in the axial direction by a first braking surface adapted to be rubbed by a brake pad, in order to exert a braking action on a vehicle; and - a second braking surface, opposed to the first one in the axial direction, and adapted to be rubbed by a brake pad, in order to exert a braking action on a vehicle; - said opposed braking surfaces (3, 4) axially define a braking volume of said body; - said first braking surface comprising a first radially inner edge which radially defines said surface on the rotation axis side, said first inner edge being inscribed by a first inner edge line which is closed and lying on a circumference with radius (R1i) of a pre-established dimension; - said first braking surface comprising a first radially outer edge which radially defines said surface on the opposed side to the rotation axis, said first outer edge being circumscribed by a closed first outer edge line; - said second braking surface comprising a second radially inner edge which radially defines said surface on the rotation axis side, said second inner edge being inscribed by a second inner edge line which is closed and lying on a circumference with radius (R2i) of a pre-established dimension; - said second braking surface comprising a second radially outer edge which radially defines said surface on the opposed side to the rotation axis, said second outer edge being circumscribed by a closed second outer edge line; - said first and second outer edges being parts of a disc outer edge which radially defines said disc on the opposed side to said rotation axis; - at least one axial portion of said disc outer edge being circumscribed by a closed disc edge line comprising at least one angular portion (A, B, C, D) which is radially recessed towards the rotation axis to form an edge outer recess entering said braking volume; - said at least one axial portion consists in at least two axial portions of disc outer edge (15, 18), each forming at least one outer edge recess (17, 19); wherein - said two axial portions of disc outer edge (15, 18) are axially spaced apart from each other; characterized by the fact that the outer edge recesses (17, 19) provided in the radially outer edges of the braking surfaces (3, 4) are present in the opposed braking surfaces (3, 4) and are angularly offset one to the other in a circumferential direction to the braking band, so as not to completely overlap each other in the axial direction. - a body having a pre-established rotation axis (a), said body having an extension in the axial and radial directions in relation to said rotation axis; - said body being restrained in the axial direction by a first braking surface adapted to be rubbed by a brake pad, in order to exert a braking action on a vehicle; and - a second braking surface, opposed to the first one in the axial direction, and adapted to be rubbed by a brake pad, in order to exert a braking action on a vehicle; - said opposed braking surfaces (3, 4) axially define a braking volume of said body; - said first braking surface comprising a first radially inner edge which radially defines said surface on the rotation axis side, said first inner edge being inscribed by a first inner edge line which is closed and lying on a circumference with radius (R1i) of a pre-established dimension; - said first braking surface comprising a first radially outer edge which radially defines said surface on the opposed side to the rotation axis, said first outer edge being circumscribed by a closed first outer edge line; - said second braking surface comprising a second radially inner edge which radially defines said surface on the rotation axis side, said second inner edge being inscribed by a second inner edge line which is closed and lying on a circumference with radius (R2i) of a pre-established dimension; - said second braking surface comprising a second radially outer edge which radially defines said surface on the opposed side to the rotation axis, said second outer edge being circumscribed by a closed second outer edge line; - said first and second outer edges being parts of a disc outer edge which radially defines said disc on the opposed side to said rotation axis; - at least one axial portion of said disc outer edge being circumscribed by a closed disc edge line comprising at least one angular portion (A, B, C, D) which is radially recessed towards the rotation axis to form an edge outer recess entering said braking volume; - said at least one axial portion consists in at least two axial portions of disc outer edge (15, 18), each forming at least one outer edge recess (17, 19); - said two axial portions of disc outer edge (15, 18) are axially spaced apart from each other; characterized by the fact that the outer edge recesses (17, 19) provided in the radially outer edges of the braking surfaces (3, 4) are present in the opposed braking surfaces (3, 4) and are angularly offset one to the other in a circumferential direction to the braking band, so as not to completely overlap each other in the axial direction.