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RapidFire ®
From WikiPedalia
Shimano below-the-bar shift levers for upright handlebars. The original version of Rapidfire, introduced in the early '90's, had two thumb buttons, one above the other. One was for upshifting, the other for downshifting. Since the motion was the same for shifting in either direction, riders found it confusing, and it was quite unpopular.
The newer generation, known as "Rapidfire Plus" uses a thumb button to shift to a larger sprocket, and an index-finger trigger to shift to a smaller one. This is a great ergonomic improvement, and Rapidfire Plus has been widely accepted.
