A Derailleur's job is to guide your chain to the right sprocket on your crankset and cassette. These highly complex machined components are tuned to give you the best gear changing experience and consistent performance regardless of what terrain you might be.
Double or triple cranksets, mechanical to Di2 Electronic shifting, you will be able to find exactly what you are looking for at Bicycles Online.
Derailleurs work best when paired to the exact same shifters, cassette and crankset.
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