John, You may want to check your tires, (after inflating them), for cracks, especially on the sidewalls. Tires, as they age, tend to "dry-rot" which is a misnomer for a deterioration of the rubber. I've read that although this type of damage is ugly, it is not structurally significant, as long as the cords (fabric) of the tire are intact, but I like my 23mm tires to be in the best shape possible.
Technology will never replace teachers, but, teachers that use technology will replace those that donít.
Bike tires, especially high pressure road bike tires lose a bit of air, and need to be checked often. I check mine (and pump them up a bit) at least one per week.
Don't risk using an air compressor. As the others have stated, invest in a decent floor pump with a gauge. You'll be glad you did the first time you use it. The frame pump is another needed investment.
I suggest that you purchase a book on bicycle maintenance so you can become familiar with maintenance requirements, lube and adjust components, and make some repairs yourself.
Another suggestion is to stop in at your LBS and have them do a quick check/tune up. If the tires are flat it probably needs some chain lube as well, and they can check quickly for other safety issues. The shop that I go to doesn't charge for this (but I don't know if that would be the case for all shops).
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