Originally Posted by CapriRacer
There was a time where our truck tire specialists had a contest where seminar participants would guess the inflation pressure by thumping a tire. A prize to the guy closest. A very dramatic way of informing people that thumping is a pretty crude way to deal with inflation pressure.
It won't tell you the pressure, but it will let you know if one tire sounds different from the other. I had a flat repaired on one of my dual wheel, dual axle equipment trailers, the guys put it on and down the road I went.
Did my walk around the next morning and that tire sounded different from the ones next to it. They had not put enough air in it, it was a good 15-20# lower than the rest. I was about to load up close 20,000# of equipment it would not have made my day to have another flat tire, especially on a loaded trailer.