How often should you put air into your bike tires? There are many variables that effect the air pressure, but all of that aside if you ride regularly you should be putting air in your tires at least ONCE A WEEK. No joke. (I'm sure you can find nit-picky forum posters/comment section regulars all over this great world wide web who'd disagree with me, but I'm not talking to them. I'm talking to you, regular bicycle rider.) Bicycle tubes are slightly porous and will lose air over time.
How much air do you put in those tires? It depends on the tire. You should be able to find the pressure recommendations right on the sidewall of the tire. Like this:
Just find the number, find a pump (we keep one right outside the shop for you to use for free!), and pump it up. Once a week.