We claim the ornamental design for a bike rack, as shown and described.
FIG. 1 is a top front perspective view of the bike rack of the present invention;
FIG. 2 is a side elevational view of the bike rack of FIG. 1;
FIG. 3 is a front elevational view of the bike rack of FIG. 1;
FIG. 4 is a rear elevational view of the bike rack of FIG. 1;
FIG. 5 is a top plan view of the bike rack of FIG. 1;
FIG. 6 is a bottom plan view of the bike rack of FIG. 1;
FIG. 7 is a top perspective view of the bike rack of FIG. 1 shown arranged in a bike tree assembly, with the broken lines shown to illustrate environment and forming no part of the claimed design;
FIG. 8 is a front elevational view of the bike rack of FIG. 7;
FIG. 9 is a left side elevational view of the bike rack of FIG. 7;
FIG. 10 is a rear elevational view of the bike rack of FIG. 7;
FIG. 11 is a right side elevational view of the bike rack of FIG. 7;
FIG. 12 is a top plan view of the bike rack of FIG. 7; and,
FIG. 13 is a bottom plan view of the bike rack of FIG. 7.