The nutshell version is this: I’ve ridden the new Dura-Ace 12-speed Di2 also, and Shimano’s Ultegra group performs every bit as well, but for a lot less money and only a few extra grams.
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The Selle Italia SLR Boost Superflow saddle is a treat when you’re on it too, while the shifting comes from Shimano’s Ultegra Di2 groupset, and that as it turns out is one of the highlights here.