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Friday, April 4, 2025

At what temperature reading of TPMS should I worry?

 Read a forum post with a question

 Hi all, very newbie here.

I have a 1/2 ton double axel travel trailer with ST225/75 R15E Goodyear Endurance Tires on it. I was  towing it today and my TPMS monitor alarmed because of tire temperature.

Now nothing extravagant, tires were between 75 and 82 PSI, running temps for all were not above 85 degrees.

The TPMS was at factory settings. I found this on the internet, this guy says 158 degrees is a standard alarm trigger for TPMS. Is there a critical do-not-exceed tire temperature?  What should I set the temperature tolerances at in the TPMS so it is not alarming with basic driving?

 

 Here is my response

 As an actual tire design engineer  who has been working with TPMS since 2002 I can suggest that you not worry about the "High Temp" warning as it is normally set to 158F. You need to pay attention to the PSI. I suggest the low pressure warning be set to the minimum psi required to support your MEASURED inflation level. I suggest that you never operate the tire in overload. TPMS Temperature is not reporting the hot spot of the tire as that point is located about 1/4" to 3/8" inside the shoulder of the tire. Rubber is an insulator so it does not transmit the heat energy to the tire inside air, TPMS temperature readings are closer to the temperature of the metal wheel, hub and wheel bearings as the metal does transmit the heat of these metal parts quickly. A high Temp reading from the TPMS without a significant increase in PSI is probably warning of a wheel bearing problem.

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