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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Good point Bob Barker. If you'll be using a cassette with larger than 27-teeth cogs, you'll be best off with a mountain bike rear derailleur. Either the MTB short/medium (GS) or MTB long cage (SGS).
Official Shimano party line for rear deraillaurs:
Road SS ("short" cage)............Double chainring....27T or smaller cassette
Road GS ("medium"/"long").....Triple chainring.......27T or smaller cassette
MTB GS ("short"/"medium").....Double chainring.....28T or larger cassette
MTB SGS ("long" cage)............Triple chainring........28T or larger cassette
Models are "upwardly" compatible (that is, a given model will also work with the setups listed above it).