Originally Posted by
series1811
This. Metal fatigue is an old wive's tale. Especially with the harder aluminum alloys used to make dropout hangers. Bending them only makes them stronger, not weaker.
Umm,replaceable derailleur hangers are meant to break, they usually are made of cheap stuff. Bending back an aluminum hanger is poor advice. My reference is on mt bikes. Where the hangers are supposed to break, saving your derailleur.