Shimano's new 105 Di2 groupset adds a long-anticipated third tier to the brand’s electronic shifting. Sitting below Dura-Ace Di2 R9200 and Ultegra R8100, it shares a lot of tech with those two ...

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We’ve seen this play out three times before, and so nobody should be surprised that Shimano’s affordable racing group, 105, has inherited the extra gear and trickle-down technology of Ultegra and Dura ...