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@miro_o
A lot of people use 15% lower pressure on the front as a guide. You really want to settle on the lowest pressure that keeps your rims and tubes safe. That's going to be totally different for someone pottering around on the flat town to someone riding hills (putting weight on the front) and going quicker.
I'm 60kg, on 25mm tyres – 85 front, 90-95 rear. 5 psi less if it's wet.