Forum Discussion

Splashers3's avatar
Splashers3
Explorer
Jun 27, 2019

Tire Pressure Accuracy

When measuring my RV tire pressure I have the TST TPMS, but when checking my tires before each trip, I also use one of those pressure measuring "sticks" (the kind in which you push on the stem and the measurer pops out the bottom telling you what your pressure is). The stick is much easier to use when adding air and with the TST, I have to repeatedly screw on/off...you guys know what I mean.

My quantry - the two systems are about 7-8 pounds different (across each tire, 111/112 vs 104/5). Which system would you trust as being closer to the real tire pressure? My tires are 110 PSI rated. The stick is one of the bigger models, over a foot long, not sure if that means its better than a small style.

Thanks for your help,
Mike
  • Had the same problem. Bought a high quality stick gauge and found out the old gauge was the problem.
  • Well, if your gauge disagrees the same amount with all sensors, then I would pitch the gauge and get a new one. One or two sensors could be off but not all of them, and not all the same amount. Time for a new gauge.
  • I have a digital tire pressure guage and it's always about 4 pounds different from the tpms.
  • My guess is that your stick is the one that is off. You need to try yet another gauge for comparison, or better yet compare your stick to one that has been calibrated. My TST sensors are within two pounds of each other.