, yes that must be it. Oh except the fact I have purposely attached it further back so it has 4 bolts all the way along rather than just two like in their images. I’m not talking about jumping directly on the mount, it would quite comfortably take someone standing directly on it, I said pull up or down on the wheel rim.
The metal is literally twisting, aka flex because of the lever point of the wheel acting upon it which you don’t get with the front mount as the moments of force aren’t acting through the same plane and there is no lever point, plus it’s 5mm thicker, basic mechanics my friend.
Of course you can’t twist it by hand
. I’ll post up a video of it since you find it so unbelievable and won’t push up/down on your own wheel.