A window lifter assembly for a window lifter provided for the adjustment of a window pane (S), comprising - a carrier (A), - a flexible traction means (Z, Z') for the transmission of an adjusting force for the adjustment of the window pane (S), and - a deflection piece that is non-rotatably arranged on the carrier (A) and includes a guide channel for the deflection of the traction means (Z, Z') in a guide plane (xz-plane), wherein for holding the traction means (Z, Z') in the guide channel at least two securing elements on the carrier (A) and at least one securing portion (11 A, 11B; 35A, 35B; 50) are provided, wherein - the at least two securing elements of the carrier (A) extend in a spatial direction (-y) that is substantially perpendicular to the guide plane (xz-plane), are spaced apart from each other and each of which faces the guide channel of the deflection piece , - the at least one securing portion (11A, 11B; 35A, 35B; 50) protrudes from an edge of the guide channel in a spatial direction (-z) that extends substantially parallel to the guide plane (xz-plane), - the at least two securing elements and the at least one securing portion (11A, 11B; 35A, 35B; 50) are formed and arranged relative to each other such that when traction means portions (ZA1, ZA2) of the traction means (Z, Z') are displaced out of the guide channel in the direction of the securing element and the traction means (Z, Z') hence abuts against the securing element , the securing portion (11A, 11B; 35A, 35B; 50) still blocks the traction means (Z, Z') against a displacement transversely to the guide plane (xz-plane) out of the guide channel , characterized in that - the guide channel has a varying depth along its extension, wherein in at least one portion the depth of the guide channel is less than a mean diameter of the traction means (Z, Z') guided therein and in at least one further portion bordered by the at least one securing portion the depth of the guide channel is greater than a mean diameter of the traction means (Z, Z') guided therein. - a carrier (A), - a flexible traction means (Z, Z') for the transmission of an adjusting force for the adjustment of the window pane (S), and - a deflection piece that is non-rotatably arranged on the carrier (A) and includes a guide channel for the deflection of the traction means (Z, Z') in a guide plane (xz-plane), - the at least two securing elements of the carrier (A) extend in a spatial direction (-y) that is substantially perpendicular to the guide plane (xz-plane), are spaced apart from each other and each of which faces the guide channel of the deflection piece , - the at least one securing portion (11A, 11B; 35A, 35B; 50) protrudes from an edge of the guide channel in a spatial direction (-z) that extends substantially parallel to the guide plane (xz-plane), - the at least two securing elements and the at least one securing portion (11A, 11B; 35A, 35B; 50) are formed and arranged relative to each other such that when traction means portions (ZA1, ZA2) of the traction means (Z, Z') are displaced out of the guide channel in the direction of the securing element and the traction means (Z, Z') hence abuts against the securing element , the securing portion (11A, 11B; 35A, 35B; 50) still blocks the traction means (Z, Z') against a displacement transversely to the guide plane (xz-plane) out of the guide channel , - the guide channel has a varying depth along its extension, wherein in at least one portion the depth of the guide channel is less than a mean diameter of the traction means (Z, Z') guided therein and in at least one further portion bordered by the at least one securing portion the depth of the guide channel is greater than a mean diameter of the traction means (Z, Z') guided therein. <EOS>