Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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Assuming you have friction shifting, any Sun Tour, Shimano, SRAM or Campy rear derailleur will work. There is nothing special about 6-speed. Some of the newer 9 and 10-speed rear derailleurs may have a problem if you use the wider 6 or 7/8-speed chains.
The advice to get a "bolt on" derailleur was probably intended to mean you need a derailleur that bolts directly to the built-in hanger on the frame's rear dropout, not a derailleur with a separate "claw" mount. All good quality rear derailleurs are "bolt-on"