First of all, its spelled TIRE not TYRE. Second, your tires tell you the air pressure of how much it needs. It will say something like this: "30PSI or 60PSI". Look for the PSI. And third, go to your local gas station to pump air in it. They have a gauge or a meter that will tell you how much PSI is in the tire and then you can add more until the gauge or meter reaches your tire pressure PSI.
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