Hi, sorry to say but there is no standard pressure for a tire size. It depends on make, load, tire type i.e. radial or crossply, tubed or tubeless. My Suzuki rear tire original Dunlop radial 36psi. changed to a Bridgestone same size 39psi. I would check with the tire manufacturer, if you run the tire over or under inflated you risk damaging the tire, poor grip and stability.
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