on the mup's I just go "ding, ding" as i ride past. people seem to like it. in amsterdam the bike bell seemed indispensible. they are useless with cars. you need a freon honker. eff the ozone layer. most urban fix and ss riders in the US probably spend more time in traffic than mixing with peds. so a bell is of limited value. i put one on my mtb, to alert bears and chipmunks.