The ornamental design for a bicycleattachment, as shown and described.
FIG. 1 is perspective view of the bicycle attachment of my new design showing the attachment in a down or operative position, in which it is positioned underneath the rear wheel of a bicycle and elevating the wheel off of the ground.
FIG. 2 is a perspective view of the bicycle attachment of my new design showing the attachment in an up, or non-operative position.
FIG. 3 is an enlarged perspective view of the bicycle attachment of my new design.
FIG. 4 is a top plan view thereof.
FIG. 5 is a bottom plan view thereof.
FIG. 6 is an elevational view of one side thereof.
FIG. 7 is an elevational view of the opposite side thereof.
FIG. 8 is an elevational view of the right end of the attachment shown in FIG. 3; and,
FIG. 9 is an elevational view of the left end of the attachment shown in FIG. 3.
The broken line elements shown in FIGS. 1, and 2, depicting a bicycle, constitute unclaimed environmental elements, and are not a part of the claim.