What do people use to lubricate the derailer and the jockey wheels - GT85 or similar, or something heavier?
GT85 works fine if you apply it regularly and clean off the excess. Any build-up of crap on the derailleur will affect its performance.
@Thrustvector started
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What do people use to lubricate the derailer and the jockey wheels - GT85 or similar, or something heavier?