Originally Posted by
Amt0571
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.
I'm sorry but that's the way it is. If the hanger is bent inwards the chain will get progressively closer to the next larger cog each shift. It will start to rub, then jump to the next cog. It's the only thing that can happen...it turns the situation into a geometry problem.
If everything is aligned properly the pulley cage is parallel w/ the cogs. If the hanger is bent inwards the line it creates is at an angle to the cogs and at some point will intersect the line created by the cogs. In the upper diagram the hanger is obviously straight, the chain will never rub or jump to the next cog. In the lower one it will. Not hard to grasp.
