The ornamental design for a crank arm for a bicycle crank assembly, substantially as shown and described.
FIG. 1 is a top plan view of a crank arm for a bicycle crank assembly
showing my new design, it being understood that the bottom is
substantially a mirror image thereof;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a left end elevational view thereof;
FIG. 4 is a right end elevational view thereof; and
FIG. 5 is a cross-sectional view thereof taken along line 5--5 in FIG. 2.