Have a big one on my cruiser. I'm much more likely to be around joggers and whatnot when riding that bike. On my roadie I use the unofficial Campy "bell" of flicking the paddle shifter against the body of the shifter but a bell would be cool. Some of the ones in this thread are nice.
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“Life is not one damned thing after another. Life is one damned thing over and over.”
Edna St. Vincent Millay