Rear derailleurs
The rear derailleur must match the number of gears and the cassette range, because each system has a different cable pull and a limited capacity. Parts from different manufacturers therefore usually cannot be combined. Electronic groupsets shift more precisely and do not need cables, in exchange for charging and a higher price. If the shifting cannot be adjusted, check the derailleur hanger first: it is deliberately softer so it bends in a crash instead of the frame, and a bent one throws off the entire shifting. Bending it back is not worth it, as the material is fatigued after bending. A replacement hanger costs little and fits in your bag for the ride.
You might be interested in: Inner tubes and tubeless, Bike tyres, Grips and bar tape, Saddles, , Bike pedals, Wheels, Handlebars, Stems
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