Quote:
Originally Posted by sweetbmxrider
I'm going with malicious activity.
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Likely this. Speaking from my experience, when the temperature dropped rather suddenly on my old beater, I got a leak in one of the tires. Turned out the valve stem got a small crack in it due to the rapid temp change. If I kept it well inflated, the stem didn't leak much but once it dropped to a certain point, it leaked rather quickly.