The bike rider runs with his red bike while another gains on him , both wearing green outfits and black helmets .
It is impossible that two bike riders are know each other , personally , outside of biking .
It is impossible that two bike riders are know each other , personally , outside of biking .
It is highly likely that two bike riders are know each other , personally , outside of biking .
Two bike riders are know each other , personally , outside of biking .