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The more supple the tyres, the higher the pressure you can actually go and still be smooth, the SWH casing is slightly more supple than the Grand Bois Hetres
In London with the start-stop traffic, I ride at 40psi, normal road riding in the countryside/club ride is 35psi, and 400+km audax is 30psi (all grand Bois Hetres).
It's currently resting at 50psi at home to stretch the tyres and bed it in a bit before dropping the pressure, I do this process to all my tyres.
@edscoble you're running the SWH at 40PSI, front and rear?? I'm 88kg and running them at 26/32 PSI front and back... like riding a sofa. My main commute is a mix of 20% road and 80% old railway track, mixture of hard pack, grass and gravel.
I'm going to try upping the pressure but you should def try and see how low you can go.