Join Date: Jul 2005
Location: St. Paul, MN
Bikes: Cannondale CAAD9, Ritchey Breakaway Cross, Nashbar X-frame bike.
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Originally Posted by Retro Grouch
Any Shimano rear derailleur that has a long arm will work.
At six speeds in that gear range, I would say ANY would work. That's well within the capability of all of their "road" derailleurs, and even more inside the capability of their "mountain" derailleurs.
The main issue, as stated, will be the attachment points.
An Acera RD, if the attachments work, will hook you up for pretty cheap, and be of enough quality to be reliable as well. After that they get "quieter", lighter, and fancier. A Sora will also hook you up pretty cheap in the "road" category.
Be mindful of the attachment mechanism.
Good night...and good luck