Published at Monday, August 06th 2018, 05:37:35 AM by Isabella Smith. Air Compressor. If you drive a large truck, with huge tires, you may find that the VIAIR 90P Portable Compressor s lacking a bit when the time comes to fill up your tires with air. This particular, portable compressor is designed more to be used with standard size car tires. It can easily inflate a flat 31 inch tire in just a few minutes. Once you hook up the VIAIR 90P Portable Compressor to your car battery, the compressor goes right to work, delivering air flow at up to 120 psi. That kind of air pressure doesn’t instantly inflate car tires, but it will get the job done in a few minutes, which is a heck of a lot quicker than dealing with a potentially dangerous tire change on the side of the road.