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@gbj_tester
Lightweight. I only use 90psi in my Diamantes for general road siding, and I'm 25kg heavier than you. Try 80psi and see how it feels.
Rated pressure on the side is the a: lowest pressue at which the tyre will work properly (i.e. not over heat) at maximum load and maximum speed and b: the highest pressure which won't blow off the rim in the worst case of tyre and rim size tolerance plus safety factor.