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Shimano has finally introduced its groundbreaking electronic Di2 technology at the Ultegra level. The new group will have lower-priced parts, with smarter wiring, at the compromise of weight and compatibility. There are currently no TT options in Ultegra Di2 -- you have to pony up the dough for Dura Ace for that luxury. But the fantastic innovations of Di2 are now available to more riders.
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