i have never seen those on a bicycle actually used in real life, it’s either regular-ass derailleur or it’s hub gears, both of which are pretty darn simple on the level you’re going to interact with them (no one disassembles internal hubs and they don’t really break)
i have never seen those on a bicycle actually used in real life, it’s either regular-ass derailleur or it’s hub gears, both of which are pretty darn simple on the level you’re going to interact with them (no one disassembles internal hubs and they don’t really break)