Shimano Dura Ace Di2 is not the first group of bicycle components to utilize electrically powered shifting, many systems came before. It is not the first electronic group aimed at road racing, Di2 was preceded by a few notable, if underdeveloped attempts. The first Shimano press releases were met with reactions ranging from mild reservation to complete dismissal. Yet there was still hope that Shimano, with their hard earned reputation for reliability, could deliver a fully realized system that would be a true advancement in the bicycle drivetrain.
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