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Old 07-12-2014, 09:35 PM   #15
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I have read thumping tires does not work to tell a change in pressure.
That is not entirely true, I started thumping tires while running heavy equipment in the 70's. You can tell the difference in tire pressure by the sound, and how much the thumper bounces off the tire. Are you going to be able to tell how much air the tire lost? NO, but after time you will be able to tell one of them is lower than the rest.

Jim
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Old 07-13-2014, 06:43 AM   #16
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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.
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Old 07-13-2014, 07:02 AM   #17
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Tire bumping was more of a practice in the good old days, when you had dual bias ply recaps on 18 wheelers. You couldn't always tell if a tire was flat just by looking, especially if the rig wasn't loaded, but you could tell the difference in sound and bounce of a tire knocker between a flat and an inflated tire. Modern technology has made this generally not needed.
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Old 07-13-2014, 07:08 AM   #18
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Originally Posted by CapriRacer View Post
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.

Aaron
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