Originally Posted by
OldTryGuy
I ring my Mickey Mouse Bell and say PASSING ON YOUR LEFT or PASSING LEFT
IMO, on your left is ambiguous and non informative
"Bike passing" or "Coming around" or "ding ding" or "Excuse me sir, I am about to overtake you" all work. But I usually just ring my bell, and I don't really care what their response is as long as they don't wander in front.