Bicycle derailleur

The invention relates to a bicycle derailleur comprising a chain guide (11) configured to interact with a transmission chain of the bicycle and movable between a plurality of intermediate positions comprised between an inner position and an outer position, a fixed body (15) adapted for being fixedly associated with a part of frame (101) of the bicycle, an outer connection element (14) rotatably connected to the fixed body (15) about a first articulation axis (A) and rotatably connected to the chain guide (11) about a second articulation axis (B) parallel to the first articulation axis (A), an inner connection element (13) rotatably connected to the fixed body (15) about a third articulation axis (C) and to the chain guide (11) about a fourth articulation axis (D), an actuation arm (20) hinged to the fixed body (15) about the first articulation axis (A), a cable-clamping washer (50) equipped with a cable-bending appendage (51) insertable in a seat (40) of the actuation arm (20). The seat (40) extends along a f