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  • Probably the rear hinge pivot, it’s a wearable part that needs replacing every so often. If your off the bike, give it a push sideways where the rear half folds (just behind the bottom bracket) and see if that moves. If so, that’s where the knocking is. Best to get it fixed asap if it’s that bad, or else risk damage to the main frame

  • No I'm pretty certain that's still rock solid. I just tried as well.

    Forgot to mention, the faster I'm going the faster the knocking is. It's directly correlated to the speed the wheel is turning hence thinking it's something on the wheel. Initially till today (and until I checked at the weekend) I thought it could have been something like a stone in the tyre, that's the kind of thing I mean about it speeding up the faster I'm going.

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