Bicycle Frame

FIG. 1 is a top, rear, and left side perspective view of a bicycle frame embodying our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in the drawings illustrate portions of the bicycle frame and environmental bicycle structures that form no part of the claimed design.