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Nope, 74kg. Tyre drop was the same as 90 or so psi on a normal rim. They are absurdly wide rims, but I've used them with gp4000s and Schwalbe one at around the same pressure.
Fwiw, I wasn't expecting free tyres and didn't push for it at all. I was returning them because I wasn't sure if it was a manufacturing fault, I certainly didn't expect a refund/replacement.
55psi in 25 seems very low. Are you a sparrow? I never used to get much more than 1500 miles out of a Corsa SC on the rear so I think you've done well.