What may be more important is the tire pressure.
Our 21VD has VanContact A/S tires, which are rated for up to 80 PSI. WBO specifies 61 PSI. Lichtsinn installed a TireMinder A1A TPMS in our View.
The A1A triggers a high temperature warning when the internal temperature hits 167F (75C) and then again at 185F (85C). Our tire temperatures when running in 100 degree Texas heat never triggered a high temperature warning.
However... We did trigger high pressure warnings. The A1A will issue a warning when pressure is 20% above the baseline pressure. If the baseline is set to WBO's recommendation of 61 PSI then the high pressure warning is trigger when the tire is 72-73 PSI.
This is still well below the max tire pressure for our tires (per the manufacturer).
Since the A1A doesn't have a way to set the trigger point for the high pressure warning (it's always 20% above midline), I increased the baseline pressure slightly to move the high temperature warning a little higher, but kept the trigger point a couple of points below 80 (to provide some margin).
Before that change, we were getting a high pressure warning on almost every drive last summer - and after the change, we haven't had that happen.
Plus, we had nitrogen added to the tires, which also helps to slows heating of the tires, keeping the pressure a little lower while driving at high speeds in high temperatures.
Recommend you look at the specifications for your specific tires. Continental (who manufacturers our tires) does not provide a temperature specification - only a max pressure.
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