One of the most popular choices is Shimano’s Di2, with 14 of the 18 men’s WorldTour teams using Shimano Dura-Ace groupsets ... but other wireless shifters may also be similarly vulnerable.
Batteries for the the shifters Although the 105 Di2 control levers are a lot like Dura Ace and Ultegra in terms of form and function, they don’t have all the same features as Ultegra and Dura Ace.
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