So my bike’s wheels say something like 40PSI, and when I feel the wheel is kinda deflated or not fully inflated, I use the bike pump and pump until the gauge indicates 40PSI, but since the gauge starts at 0, and there was already some air left in the wheel, does that mean I went over 40PSI? Or does the bike pump compensates for the leftover air somehow? How should I properly pump the wheels to the recomended PSI?
In: 6
Pump until it says 40.
It measures by measuring the back pressure as you’re pumping the air. Because air is a fluid, the pressure is constant everywhere, so the back pressure is the same as the tire air pressure.
When it starts at 0, that is because either the air in your tire is at equilibrium (atmospheric pressure), or it’s so low that it isn’t easy to see on the gauge.
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