Originally Posted by
soyabean
This is common with crazy groupsets like 1x11, and almost all of the time is that something is bent out of original alignment.
You don't need brute force or an accident to misalign a RD, sometimes a bump on a doorway can do that.
A LBS will fix it 100% with their Park Tool DAG-2.2 .
Me, I just eyeball it and get it right most of the time.
I already invested in the DAG-3. The hanger was indeed bent. i bent it back, but it didn't fix the problem. What did seem to fix it was adjusting the barrel adjuster while pedaling, as the White Industries guy suggested. I'm not sure whether the other cogs shift as well after the adjustment. They may be making some noise. It's hard to tell when riding, as opposed to when on the stand.