TPMS temps

The air in the tire is in direct contact with the sensor, though that really doesn’t matter. What matters is the temp of the tire itself. The tire heats up, the rim (being a great conductor of heat) heats up, the valve stem heats up, and the sensor, also.
So, I got a pretty good idea of the actual temp of the tire from the TPMS.
I’ll do another reading when we hit S.C. this summer.

MY TST temperatures typically run about 10-15 degrees warmer than ambient.

Since the sensor is external to the tire and only mechanically connected to the wheel via a valve stem with no air exchange it can not tell you what the internal tire air temperature is. Also the sensor is flying around in ambient air at 60 mph thus there would be significant cooling.

OK, next go round.
65 cold psi
70 running psi
66 o/s temp partly cloudy, some sun
Tread-84
Hub-92
Sidewall-92
TPMS-80
TPMS on valve stem-80

All in degrees F
55 to 65 mph back roads, a few towns

kellem wrote:
Thanks for sharing.

Tip:
Always run the the maximum recommended tire pressure stamped on sidewall.

Was running a tad lower at 60 to 62 pounds cold. Next time it will be at 65 psi.

wanderingbob wrote:
Did ya shoot the wheel bearings ?

No. I didn’t even think about that. Thanks for mentioning it. I’ll do it next go round.

In the summertime on a hot day I usually see the TPMS measured temps to be in the upper 90s at highway speeds. I run on GY Endurance tires.

When it's cool like this the tire temps can flux wildly and even be somewhat warmer/cooler based on what side the sun is hitting. We camp through the winter and when heading out at 65psi (max), that quickly soars when outside temps creep up.

Usually grab the outside hubs to check for bearing heat. Do carry a heat detecter to check various locations on the hubs and axles, never been more than hand warm...except on 90+ deg days, hot to the touch.

Did ya shoot the wheel bearings ?

Thanks for sharing.

Tip:
Always run the the maximum recommended tire pressure stamped on sidewall.