You'll be able to find the proper tire pressure from the manufacturer manual. Although it will vary from make to make... It should be approximately....for two wheeler. PSI(Pounds Per Square Inch) 18-24 psi for the Front tire. 28-36 psi for the Rear tire. The best tire pressure for a car should be indicated on the Weight/Safety label on the driver's door jam, in the center console, or in the user manual. The tire will normally have the maximum tire pressure on the sidewall (do not exceed this.) Below is an example of the door jam sticker: For bicycles, the tire pressure depends on type of tire/tube. You should consult the user manual or bike shop if you are not familiar with testing by hand / firmness. Road tubes/tires often allow 70-100psi while mountain bikes and "cruiser" bikes use much less (30-40psi)"