Originally Posted by
bitpuddle
It is difficult to say without seeing it happen, but:
- that chain looks too short
- if the chain was that worn, there is a good chance that the cassette and possibly the chainrings are also worn. Chains and cassettes wear together, so putting. New chain on a badly worn cassette can make the performance worse.
I'd start here.
The good news is it looks like the chain is a 7 speed and you should be able to easily press a link or two back in.