Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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Originally Posted by CravenMoarhead
7 Speed shifters and any Index compatibe RD seems to be the consensus.
Yes. Except for pre-9-speed (1997) Dura Ace, all Shimano indexed rear derailleurs have the same cable-pull ratio/geometry. As far as number of gears compatibility, if the number of gears in the shifter and the cog match, then the derailleur will go wherever it's told to.
Other factors you should consider:
-Chain wrap capacity: determined by the length of the cage--between the two pulleys--so that with the proper chain length you can use the bib chainring/big cog combo and still use the small/small combo without the derailleur folding into itself with no tension.
-Max cog capacity: so it can work with the size of your larg(est) cogs.
In general, for Shimano RDs:
-Road SS: double chainring, 27T or smaller cog
-Road GS: triple chainring, 27T or smaller cog
-MTB GS: double chainring, 34T or smaller cog
-MTB SGS: triple chainring, 34T or smaller cog