Originally Posted by revcp

IME, this is the reason most people lose air in a tubeless setup (one that actually "sets" and initially seems to work). You really have to make sure the valve core is tightened down. Not doing so often results in a slow leak. I don't ride tubeless for flat protection, as that hasn't been an issue for me here in Minnesota, and not really to save weight either. I just don't like riding tubes at low pressure because the tires and tubes fighting each other feels like raccoons wrestling in a gunny sack, to say nothing of the squishy squeegy sound.