Originally Posted by
Andrew R Stewart
I agree that a vastly larger volume, than typical bike tires have, will mean that the natural pressure loss will be less noticed. However, I have attributed natural loss much more due to higher pressures (2 to 5 times more than most cats need) and thinner amounts of rubber between the pressured air and the outside air. Andy
We're getting closer, but not home yet.
Loss of air pressure is proportional to but not the same as air volume loss.
Differences in the pressure loss rate depends on 3 main factors.
The initial pressure, the volume to surface ratio, and the permeability (thickness and properties) of the tire or tube.
Bikes lose air faster because all 3 are against us compared to cars. However, the rate will slow as the pressure drops.