The ornamental design for a bicyclestand, as shown and described.
FIG. 1 is a front elevation view of a bicycle stand showing my new design. The two V-shaped openings represent boundaries and form no part of the claimed design.
FIG. 2 is a right side elevation view thereof, the left side elevation view is a mirror image of the right side; and,
FIG. 3 is a top plan view thereof.
The broken lines at the bottom of the support posts in FIGS. 1 and 3 form no part of the claimed design.