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@wvm
I had the same thought too although I was thinking more of the force going to the back wheel via the frame if the bike is being rocked from side to side. If you imagine the bike leant to the left and a lot of pressure going down into the right pedal, some of this 'may' travel back through the frame and into the wheel flexing it sideways and into the cage.
As I've said above it could be down to my poor climbing technique, complete tosh, or a combination of both or indeed, something completely different.