TPMS Accuracy

TPMS Accuracy

I purchased a Martins Industries MHA-100 automatic tire inflator accurate to +/- 0.3 PSI. The cold tires were inflated to 45 PSI, the recommended pressure, but the TPMS indicates 46 PSI on the driver's display, and can show as high as 49 PSI after about a half hour of 60 mph driving on a 50 degree day. Does this sound normal?

Bighorn | 2019年3月16日


barrykmd | 2019年3月16日

I second the motion from the gentleman from Wyoming.

hammer @OR-US | 2019年3月16日

And the motion is carried.

murphyS90D | 2019年3月16日

Rule of thumb:

For each 10° F change in ambient temperature the tire pressure will change 1 psi. | 2019年3月16日

And when driving fast, the tires heat up too. That's one reason the tire pressure (when filling them) should be measured when cold (i.e. not driven in the last hour or so).

barrykmd | 2019年3月16日

Another rule of thumb - as elevation changes, the TPMS becomes inaccurate because it has no external reference. A mile above sea level it reads 3 psi low (if calibration was done at that elevation).

sr.smr | 2019年3月16日

Thanks guys!

NKYTA | 2019年3月16日

There isn’t really anything to add from response post one, nor what a search on the forums might reveal, or a search on google.

But it is nice that in these trying times, owner outreach still exist with details.

Shall we talk about rivets now? ;-)