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@bright
Someone @gbj_tester would have to work it out quantitatively, but that's going to put a very amount of stress on the head tube cluster (not designed for it) when under acceleration or going up a hill.
I'm guessing, with a heavy rider and under full power close to 5x the normal load. When just petering along, probably 2-3x.
Combine this with the wrong choice of bike and there could be a complete failure of the frame.
The irony is there's no real need to limit the weight on the rack as it just goes through the hub and wheel.
Just my thoughts from halfway around the world.