Per :
So how did it get loose and why? Besides, I have ridden substantial
distances that included hard braking with the QR open with no effect.
What did your wheel do that you could notice when braking?

That's the $64,000 question.

I'd put my money on either:

- Some artifact of being transported on a rear carrier for several hours

OR

- Yours Truly suffering from some sort of RCI.
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PeteCresswell