A cable installation aiding device is used to aid in the installation of cable members (e.g., brake cables or the like) in a steerer tube of a bicycle. The cable installation aiding device has an attachment part and a first cable guide part. The attachment part is preferably attached to the inner circumferential surface of the steerer tube. The first cable guide part is configured and dimensioned to guide cable members passing through the steerer tube between a first axial end of the steerer tube and an outer circumferential side opening of the steerer tube that is spaced from a second axial end of the steerer tube.
