PSA: I figured out why your derailleur hanger keeps bending

I kept seeing bikes come in where the derailleur hanger was slightly bent after every ride. Took me 3 tries on my own bike to realize I was over-tightening the quick release skewer. Got a torque wrench from a buddy and found the sweet spot at 12 Nm for road bikes. Has anyone else dealt with this or am I the last one to figure it out?

2 comments

2 Comments

the_jamie11d ago

Wait, are you telling me I've been muscling my skewers down like I'm tightening lug nuts on a semi truck? I still cringe thinking about all those "ghost shifting" issues I had last season that I blamed on everything except my gorilla grip. Funny how we all think we're being "thorough" when we're actually just being destructive. At least now I can stop buying replacement hangers in bulk, though my torque wrench is definitely getting more use than my actual bike tools now.

-1

kimreed11d ago

Think about it this way - your derailleur hanger is basically a fuse. It's designed to break before your frame does when you crash. But cranking down on your skewer like that, you're actually stressing out the dropouts and the hanger every single ride. I've seen frames crack right at the dropout on older bikes from people overtightening. And that ghost shifting you mentioned? That's the frame flexing under your gorilla torque. The alignment goes just a hair off and your bike thinks you're shifting when you're not. So yeah, back off on that skewer and give your bike a break.