Licensed Bike Geek
Join Date: Oct 2002
Location: Los Barriles, Baja Sur, Mexico
Posts: 1,360
Bikes: Look 585, Kirk Terraplane, Serotta Ottrott, Spectrum Super Custom, Hampsten Carbon Leger Tournesol
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It sounds like you may have bent the rear dérailleur hanger or the dérailleur pulley cage. In either case, I would take it to your favorite LBS and have them check it out and fix as necessary. It doesn't sound like just an adjustment.