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
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
What do people use to lubricate the derailer and the jockey wheels - GT85 or similar, or something heavier?