Originally Posted by
noglider
I betcha the jockey wheels aren't really squeaking but rather the chain. You hear the sound there, because the chain bends the most there.
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Very good point, and think you might be right.
I was thinking something like that a few hours ago after I oiled the wheels but still heard some squeaking.
I gave the wheels a good oiling with the derailleur sitting flat on a bench (I was swapping all the parts from one frame to another), then put it on the bike, but it still squeaked -- then I noticed the chain was dry