Originally Posted by
woodcraft
A 28t cassette can use a short cage RD for slightly snappier shifts and a few grams lighter, but the GS one preserves the option to put a larger cassette on if you want.
+1 on the long cage....I have that setup, gives me flexibility to change out cassettes when I venture to hilly areas to put on a 30, 32, or 34 tooth cassette if I want.