Hi.
This are rice tires. The pressure depends on what you want to get from your tires.
Ideal pressure for races range from about 5 PSI below maximum pressure to a value near to maximum pressure.
A good value for racing will start at about 45 PSI, up to 50 PSI.
Keeping the tires at race pressure (use 45/46, not 50) will give you good performance, but driving will be quite harsh.
For a good performance on everyday driving you can keep the tyres at 35 to 38 PSI, depending on terrain.
Here specs table.
Regards.
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