With a small compressor all it takes is an air hose, some fittings, and an inflator, and you can pump up any tire (and anything else inflatable) in just a few seconds. There are also tools ...

though you can use an air hose with standard fittings. The compressor itself is hidden away. You can connect the hose both to let air out of the tires, and to refill them later. It works quickly ...