Originally Posted by
likewater
Never dropped and never hit the derailleur on anything.
Doesn't take much. Might have come that way from the store. If it's 7-speed you can probably diagnose it yourself:
1. Shift into a gear combination that makes the derailleur arm point straight down toward the floor.
2. Now prop your bike upright against something and look at the derailleur from the rear or the bike.
3. If the arm seems to be pointing inward toward your rear tire, that's it!
I own the Park tool for straightening hangers but, on a 7-speed equipped bike, I can align it adequately just by eyeball.