The invention refers to a belt-roller arrangement with a deflecting roller (13.1, 13.2, 13.3) and an endless flexible belt (1.1, 1.2) and to a method for guiding such a belt (1.1, 1.2) over such a roller (13.1, 13.2, 13.3). The roller body (11) of the roller (13.1, 13.2, 13.3) comprises two deformable roller body segments (20.1, 20.2) and a rigid roller body segment part (12) which is - in an axial direction - positioned between these two deformable segments (20.1, 20.2). The belt (1.1, 1.2) is entirely guided over the central rigid segment part (12) and at least partially over both deformable segments (20.1, 20.2). The belt run is automatically corrected.
