Originally Posted by
daniell
I just placed my rear wheel on my truing stand and spun the wheel. All of the cassettes except the last two large ones seem to be wobbling, though there is very little play in them. Can this be a factor in the ghost shifting?
Any wobbling of the cogs will look worse on the larger cogs.
Shimano cogs (and those that mimic Shimano) these days have a series of a few teeth in a row that are differently shaped for shifting ease. These spots can also look to be a wobbled cog.
Many ghost shifting issues are cable friction caused. But weak return springs are also a common issue as the years add up. One way to test for cable friction is to disconnect the rear shift cable (pulling a casing end out of a frame stop is the easiest way)and then move the der with your fingers to see how it works independent of the cable or lever.
There are other reasons like bent teeth, twisted/damaged chain, miss matched chain/teeth wear, badly worn guide pulley. With the wider tolerances (compared to 9, 10, 11, 12...) of an 8 cog system the der hanger alignment is of somewhat less concern, the fewer the cogs the more tolerant the system is to misalignments in general. Andy