Derailleurs are the transmission of your bike. When you shift, they guide the chain to the correct gears. Whether you’re fixing a particular problem with your chain or simply giving the system a ...
In 2009 Shimano brought electronic gear-shifting to road bikes, in the form of its Dura-Ace Di2 group. The slightly-less-pricey Ultegra Di2 system followed, although it was still aimed at roadies.
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