Is it bent? That's usually when the thing is hitting the limit screws.
EDIT: Nekature said exactly the same thing so I've typed this for nothing.
In other news 11-36 cassette coming from Shimano
11 or 12 speed?
Ooh, good point. I'm mostly in the 11s world. Forget they've trickled out their stupid 12s to road stuff now.
@Brommers started
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Is it bent? That's usually when the thing is hitting the limit screws.
EDIT: Nekature said exactly the same thing so I've typed this for nothing.
In other news 11-36 cassette coming from Shimano