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the bikes are rated to carry up to 150kg of cargo (not including bike and rider)
The bikes might be, the rims maybe not so much. Manufacturer's spec says 180kg maximum total system weight. Tyre width and pressure don't seem to be outside normal bounds, you're bang in the middle of the size range and 4 bar in a 54-56mm tyre is at the top of the range obviously, but not what anybody would call over-pressure on a heavy metal rim. On the other hand, "should be around" might be hiding a multitude of sins. By my back of a fag packet calculation, your width/pressure is going to be pretty squishy if all-up weight creeps up past 250kg - it's basically the same squish as me running 2 bar on my MTB, which is fine for me off road where I like the tyre to move about a bit, but your riders might be sneaking another couple of bars in while you're not looking to get lower rolling resistance and tighter handling on tarmac.
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gbj_tester
@MCamb
tyre section varies between 2.15” / 2.25”
Tyre pressure should be around 55psi
And the bikes are rated to carry up to 150kg of cargo (not including bike and rider)