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It just takes one ride, one shift, one moment and you'll feel the difference. You'll be blown away. You'll be amazed at the engineering. You'll shift again to see if it was a fluke. You'll see that it wasn't. If there is one product that is set to revolutionize shifting this is it: the Shimano Dura-Ace Di2 Electronic groupset. We aren't talking about a mere attempt at electronic shifting, this is it! Shimano has set the naysayers aside and has worked dilligently for years developing, fine-tuning, and perfecting a complete electronic groupset. Perfect shifting. One shift at a time. Digital Integrated Intelligence.