using thorn resistant tubes , because they are thicker rubber, the pressure is retained longer..

and there is also the standard operating pressure.. greater the PSI in the tube, the more difference
in comparison to the outside air pressure , the more the air seeks to equalize .

so... light tube , high pressure , narrow tires is a different situation, than HD tubes in a Beach Cruiser.


On a Bike-Camping Tour of Ireland.. 700c -40 tires, HD p/v tubes ... I still topped off the tires to 6 bar,
when I felt the rolling resistance was increasing. every couple days..