Bicycle frame
FIG. 1 is a top plan view of a bicycle frame showing my new design; 
     FIG. 2 is a right side elevation view thereof; 
     FIG. 3 is a front elevation view thereof; 
     FIG. 4 is a right side elevation view thereof, it being understood that the broken lines are for illustrative purposes only, and form part of the claimed design; and, 
     FIG. 5 is a left side elevation view of FIG. 4.