The derailleur is an important, albeit French, part of most modern bikes. This video features a professional mountain bike mechanic demonstrating the installation of a rear derailleur on a mountain bike. It is a short video, but detailed enough that any DIY bike mechanic should be able to do it themselves.
Just updated your iPhone to iOS 18? You'll find a ton of hot new features for some of your most-used Apple apps. Dive in and see for yourself:
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