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BareNecessities-
The chain tension was good so what probably happen is my awesome power combined against the QR skewer and chaintug to move the wheel forward slightly. This combined with me crashing into piles of dirt which filled the singlespeed freewheel enough to kick the chain off it. Cold weather meant my hands were too weak to undo the wheel and add tension back into it.
None of this would've happened with Di2 ;)
hippy
It was an efficient chain... right up until it was a slack chain.