FIG. 1 is a front view of a bicycle computer showing my new design; FIG. 2 is a back view thereof; FIG. 3 is a left view thereof; FIG. 4 is a right view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a right, front, top perspective view thereof; FIG. 8 is a right, rear, top perspective view thereof; FIG. 9 is a left, front, bottom perspective view thereof; and, FIG. 10 is a right, front, bottom perspective view thereof.