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Tyre preasure is not dependent on ur wheel size - only the weight of the car! If the weight of the car goes up - so should the preasure... hense the laden and unladen preasures on most charts.
I actually phoned Pirelli when I was changing wheel sizes on my old 205 - they were very helpfull.
Running too high you may loose a little grip, run to low and ride will suffer and so will fuel consumption... (to an extent)