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So I bought a vintage bike equipped with some nice modern components off Craigslist, and I've been giving it a deep clean and mechanical check. On the 3rd to lowest gear the rear derailleur folds in on itself and grinds, so I figured the chain was too long, but as shown in the image It doesn't look like there's much room for popping out chain links. Am I retarded or is this derailleur too short for this setup? It has a Dura-Ace rear with an Ultegra crankset, but It shifts great on the other gears.