What's the story here?

Stopped at the petrol station this morning and spotted what appears to be an entirely toothless front sprocket on the floor next to one of the pumps.

I can’t imagine that anyone managed to ride it to Tesco to do a quick change at the pump so how did this poor neglected sprocket come to be heartlessly abandoned like this?

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Someone chucked it?
Fell out of a rubbish bag?

I think we need CSI here

jeez, they got their monies worth out of that one

Fuck, that’s absolutely shagged.