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.
Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check Gadget Hacks' list of supported iPhone and iPad models, then follow the step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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