Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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If it looks fine and shifts fine, don't worry about it. Shifting fine is what we're after.
If it starts doing goofy things, like refusing to shift into a cog in the middle of the cassette, you'll probably need to have a shop use a gauge to realign your hanger. As rear cassette spacing has gotten closer, hanger alignment has become more critical. I think that the best way to eyeball it is to shift into a gear combination that has the derailleur cage pointing straight down and looking at the bike from the back to see if the cage is parallel to the main frame triangle. Unless you're really good, that might not be accurate enough.