Originally Posted by
bampilot06
So, what the hell can cause a rear derailer to only shift correctly 6 out of 10 tries?
I don’t get it, I literally can’t adjust it any differently, or it won’t shift to the other cogs? Could the cable be bad?
Just issues with going to the smallest cog?
I'd start with maybe a 1/4 turn CCW on the high limit screw (or what Shimano calls the Top Adjustment).
Per Shimano the upper jockey wheel is to be aligned with the
outer edge of the smallest cog, if it's centered on the cog it will have issues dropping in to place.
