Forces applied on the bolts in the bike's hinge

[sophiecentaur]

I took a shortcut. 1080MPa x 50,25mm2 = 54250 N --> (roughly equals to a mass of 5400kg)

Your "shortcut" took you down a blind alley. A Force doesn't ever 'equal' a mass. What would your mass be doing to be equivalent to that Force? It would be gently resting on the ground. If you are not familiar with Newtons then perhaps you should have more contact with the unit and then you'd use it as a matter of course. Imperial Units have always suffered from the possible confusion between force and mass (you can tell me about slugs but how many members of the public knw about them?). Please don't bring that problem into SI situations.

 

[kielbasa]

So far, so good. I found a turner who made the same-looking bolts (he modified some strong truck's engine bolts, he mentioned they're grade 10.9 steel ) and I installed them on my bike. We will see what happens, hopefully, they won't break.