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 ...

The rear derailleur is no different in this regard, but in order to demystify how it works, we need to break it down into its constituent parts.

Within the application, Shimano states: "While a bicycle travels on uneven terrain, it is possible for the chain guide of the rear derailleur to hit rocks, ground and so on.