Why Replaceable Rear Derailleur Hangers?

So…why do we have replaceable rear derailleur hangers? When rear derailleur hangers were first envisioned, the inventors of the rear derailleur obviously needed to attach the derailleur to the bicycle frame. Therefore, bicycles with rear derailleurs in that day and age used a rear derailleur hanger that was part of the frame. In other words, […]

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