FIG. 1 is a perspective view of a stationary exercise bicycle frame showing our new design;

FIG. 2 is a right side view of FIG. 1, the left side being a mirror image thereof;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a rear view of FIG. 1; and,

FIG. 5 is a top view of FIG. 1.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design.