An adjusting mechanism is provided for a bicycle derailleur, which can adjust
a position of a chain guide in an axial direction. The derailleur basically has
a base member, a movable member with the chain guide and a linkage assembly. The
adjustment mechanism is preferably operatively coupled between the movable member
and the chain guide, or between the base member and the frame. The adjusting mechanism
includes a first tubular portion, a second tubular portion, a biasing member and
an adjustment member. The second tubular portion is arranged around the first tubular
portion to move axially relative to the first tubular portion via the adjustment
member. The biasing member is arranged to apply an urging force on the tubular
portions. One of the tubular portions has a rigid non-compressible support projection
arranged to selectively contact the other tubular portion when the tubular portions
move relative to each.
