I had a flat on the side of the road. So I took my wheel off to replace the tire with a temp to get me home. When I reinstalled the wheel, the derailleur "opened up" completely...what have I done/forgot to do? Can I fix it or is it done?

enter image description here

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    I find it unlikely that you would have accidentally adjusted the "B tension" screw or that it could even cause such a large adjustment. Have you checked if there is a broken spring in the derailleur? – juhist Sep 12 '20 at 7:16
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    You're on a smaller gear at the rear end and your chain is tight. That should not happen, and it's potentially a serious problem, whatever is causing it. If you were to try shifting to a larger gear on the rear now, the chain would try to be even tighter, which won't end well. I don't see how it can be a problem with the derailleur - something else is pulling the chain tight - which doesn't really make any sense. Check the chain - where is it? Post pictures that show the entire chain - where it's sitting, what gear(s) it's on. – Andrew Henle Sep 12 '20 at 13:14
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    Does Acera have offset jockey wheels? To me, it looks like the guide pulley is missing. There’s also what looks like a bend midway on the derailleur cage, although that may be intentional as well. – MaplePanda Sep 12 '20 at 17:20
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    Try removing the wheel again and see if the derailleur can pivot around the mounting bolt. In the photo, that pivot seems to be rotated too far clockwise, which is why juhist suggests the possibility of a broken spring. I also think you may be missing the B-link; the derailleur in a more “normal” position would be awfully forwards. – MaplePanda Sep 12 '20 at 17:25
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    Its been a couple of months, how have you got on with this ? Did you fix it? Please do post an answer showing what the cause was. – Criggie Jan 13 at 11:25

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