Your correct tire size and tire pressure can be found in your vehicle’s owner's manual in the glove compartment or on the OEM sticker on your driver’s side door.
OEM stands of Original Equipment Manufacturer. Quite simply, these are the tire specs that originally came with your vehicle, according to the manufacturer (Honda, Ford, etc). It includes the tire size, rim size, the aspect ratio, etc. To learn how to read this information, click here.
The correct tire pressure to inflate your tires can be located on the vehicle or tire placard or Vehicle Owners Manual and is the proper tire pressure to maintain, so your tires can give you maximum performance, including gas mileage and tread life. For proper results, make sure your tires haven't been driven for three hours before you check for air pressure. (Friction creates heat, which increases tire pressure and gives improper readings.) Be aware that the air pressure displayed on the tire sidewall is the maximum pressure, not the recommended tire pressure. To learn how to properly check pressure, click here.