| If your tube doesn't have a hole in it:
1. the valve may be leaking
2. over a long period of time they will go flat. Even good valves don't seal completely and the tube itself passes air through the rubber very slowly. Cyclist, like me, who keep 100+ PSI in the tires have to pump them up at least once a week because of this fact.
Finally, slow leaks are at times very hard to see, you very well may have a hole but can't find it.
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