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Shimano Di2 (Digital Integrated Intelligence) is a tried-and-true automated gear-shifting system that allows riders to shift gears with accuracy and speed up with a swift tap of a button. This technology for road bike was first introduced in 2009 with the announcement of 7970 series "10-speed Di2". It was in 2014 when Shimano first introduced Di2 shifting system, the Deore XTR M9050 for mountain bikes.
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