Bicycle frame

FIG. 1 is a top, front, right side perspective view of a bicycle frame, showing the claimed design;

FIG. 2 is a top, rear, left side perspective view thereof.

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dashed broken lines in the drawings depict portions of the bicycle frame that form no part of the claimed design.