Bike Towing System

FIG. 1 is a top perspective view of a bike towing system showing my new design; FIG. 2 is a bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left view thereof; FIG. 6 is a right view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The evenly-spaced broken lines illustrate portions of the bike towing system that form no part of the claimed design.