Originally Posted by
cxwrench
This is not correct. 99 times out of 100 the hanger gets bent in or twisted. This will have very little affect on the smaller cogs and will get progressively worse as you shift to larger cogs. It will NOT create a shifting problem in only one gear.
That doesn't agree with my experience. My old bike SRAM X9 rubbed on the 3 biggest cogs but shifted well on the others until I aligned the hanger. My current bike 12sp SLX rubbed on the side of the 2nd biggest cog and suffered from lazy shifting between 2nd and 3rd cog only until I aligned it.