A door closer having an output shaft, on which a cam disc is torque-proof disposed, and a pressure roller, wherein a closer spring presses the pressure roller against a running surface of the cam disc by means of an operational connection (106, 111, 107), the pressure roller being disposed with regard to an axial centre of the output shaft such that, upon opening or closing of a swing leaf, which may be coupled to the output shaft, the pressure roller is moved along a path, wherein, based on the fact that the path by-passes the axial centre of the output shaft, and based on a configuration of the running surface of the cam disc in different modes of operation of the door closer at a respective opening angle of the swing leaf, a very similar or identical torque is applied to the output shaft, • wherein the modes of operation comprise an operation of the door closer with a sliding track and an operation of the door closer with a standard arm assembly or a scissor arm assembly, and • wherein the door closer with a sliding track operation is mounted on a pull-side and with a standard arm assembly operation is mounted on a push-side, or wherein the door closer with a sliding track operation is mounted on a push-side, and with a standard arm assembly operation is mounted on a pull-side, • wherein the cam disc, seen in a first direction (±y) parallel to a longitudinal extension of the output shaft, includes a symmetrical cross-sectional surface, • wherein the bypassing of the path of the pressure roller is configured such that the door closer is adapted for the sliding track operation on a first section of the running surface of the cam disc, and for the standard arm assembly operation on a second section of the running surface of the cam disc, wherein a start of the sections of the running surface of the cam disc consists of a location of the running surface of the cam disc, against which the pressure roller rests, if the swing leaf is closed, characterized in that an arrangement consisting of at least the closer spring, the pressure roller and the operative connection between them in a first plane (x, z) transversally to the longitudinal extension of the output shaft is disposed to be rotatable by means of a closer housing or a spring abutment of the arrangement, wherein a point of rotation of the arrangement includes a distance to the axial centre of the cam disc in the first plane (x, z), or the arrangement in the first plane (x, z) at an angle (α) with regard to a connecting line between the pressure roller and the axial centre of the cam disc is displaceable and/or pivotable by means of a closer housing of the arrangement, in that the closer spring housing may be both displaced and pivoted by means of rotating one or more setting screws, wherein the arrangement is respectively disposed to be arrestable and serves for setting the position of the pressure roller with regard to the cam disc. • wherein the modes of operation comprise an operation of the door closer with a sliding track and an operation of the door closer with a standard arm assembly or a scissor arm assembly, and • wherein the door closer with a sliding track operation is mounted on a pull-side and with a standard arm assembly operation is mounted on a push-side, or wherein the door closer with a sliding track operation is mounted on a push-side, and with a standard arm assembly operation is mounted on a pull-side, • wherein the cam disc, seen in a first direction (±y) parallel to a longitudinal extension of the output shaft, includes a symmetrical cross-sectional surface, • wherein the bypassing of the path of the pressure roller is configured such that the door closer is adapted for the sliding track operation on a first section of the running surface of the cam disc, and for the standard arm assembly operation on a second section of the running surface of the cam disc, wherein a start of the sections of the running surface of the cam disc consists of a location of the running surface of the cam disc, against which the pressure roller rests, if the swing leaf is closed,