Ever since I put my rear wheel on after taking it off, I have had this constant clicking noise from the cog.
Here's what I know:
It wasn't always like this. I rode for a few months with no clicking noise.
Chain line appears to be straight.
Clicking sound comes from the top of the cog when pedaling forward and the bottom of the cog when pedaling backward.
Chain appears to "bounce" quite a bit when leaving the top part of the cog when pedaling forward and when leaving the bottom part when pedaling backward.