Abstract: A bicycle derailleur is provided with a base member, a linkage mechanism, a movable member and a guide member. The base member is configured and arranged to be attached to a bicycle frame. The linkage mechanism is coupled to the base member. The movable member is coupled to the linkage mechanism. The guide member is pivotally supported on the movable member, and is biased relative to the movable member in a first direction about a pivot axis. The movable member has first and second stoppers and the guide member having an abutment member. The first stopper is arranged to selectively contact the abutment member to restrict rotation of the guide member in the first direction. The second stopper is arranged to selectively contact the abutment member to restrict rotation of the guide member in a second direction opposite to the first direction.

Abstract: A bicycle derailleur is provided with a chain guide that basically includes inner and outer guide plates, a guide pulley and a tension pulley. The tension pulley is rotatable about a rotation axis between free ends of the guide plates. The tension pulley has an annular recess disposed about the rotation axis to form a projection. The inner guide plate has a guide section with a radially outermost edge. Preferably, the outermost edge of the guide section is located in the annular recess, and the projection projects axially further from a center plane of the tension pulley than the outermost edge. Preferably, the chain guide includes a dust cap coupled between the inner guide plate and the tension pulley. Preferably, the outermost edge of the guide section is located radially inwardly of the projection and radially outwardly of the annular portion of the dust cap.