simple question
i'm sure there will be raging flames and controversy
but
here goes
assume presta valve and pump

you know how the pressure goes up, then back down, for each stroke?

which one is the real tire pressure, the high or the low number?

it can vary as much as 20 psi in my experience
so
?


i would guess the low number is correct..
discuss among yourselves..
(surprised to have never seen this come up)

also complicating matters: depending on the seal at the nozzle/valve junction, the pressure may go on down to zero
as air leaks from the hose, though the presta valve has closed by then
.. obviously the tire pressure isn;t zero..



wle