If I were running the standard size tyre, I would certainly use the pressures as recommended on the filler cap.
My understanding is that with a non-standard size though, there's a different amount of rubber and a different volume of air in the tyre, so a different pressure is required for the tyre to behave in the same way as factory spec.
I canvassed this forum for recommended tyre pressures for the 275 size and someone kindly told me what their user manual said. Sorry, I've since forgotten the good samaritan and the pressure, but I've been following it ever since.
I'm happy to be schooled in this topic though - nothing would soothe my OCD more than being able to use standard pressures on non-standard tyres.
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