Originally Posted by
soyabean
New RD's are very well made today, even a brand new economy Tourney from today works flawlessly on 6s and 7s.
I can attest to that. A Tourney TX ($13 new at LBS) made a fine replacement for the Dahon compact rear derailleur (replacement would have been $80!!), the Tourney worked much better. Box said 6 speed (in hand sharpie) but worked great on my 7 speed. Mine is a GS (mid) length cage. The TX also comes in direct mount, or a claw mount for those without a rear derailleur hanger, like my folder.