Originally Posted by
greatalexander
I've noticed that every 2nd or 3rd pedaling cycle, the rear derailleur and derrailer pulley are clicking and moving funny. It seems as of the chain is out of alignment or something.
I suspect a tight chain link. Put your bike in a stand and turn the pedals slowly while watching the chain pass through the derailleur. If it's a tight link, it should become obvious which link is the problem:
Park Tool Co. » ParkTool Blog » Tight Link Repair