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Old 03-17-2014, 08:50 PM   #1
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I suspect that this has been discussed before but I couldn't find the thread, so here goes.
I have a new external TPMS, so now I have lots of information but what does it mean. What is considered excessive tire temp, how do you understand inflation. Example, left the campsite this morning, front tires were at 95psi rears at 105, during the course of the day fronts were often times not equal but ran about 105, whereas the rears were all over the map either 110,115,119 etc.

Tire temps were consistently about 78, with little variation.
Information is good if you know what to do with it, otherwise mind boggling.

2005 Winnebago Vectra, 2013 Ford Edge AWD toad, Jim & Barb along with our two Westie co pilots Maggie and Buddy
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Old 03-17-2014, 09:18 PM   #2
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Expect pressures to go up a little (like yours showed) as daytime temperatures and heat builds up in the tires. As long as all tires read close in temperature build up, it's O.K. If one tire spikes higher than the others, it could be damaged or a brake dragging heating things up. Pressures can change due to road crown, bumps just as a reading is taken, etc.


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Old 03-18-2014, 01:52 AM   #3
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My fronts are at 110lbs, rears at 95lbs. All coach tires routinely increase 15-18lbs while running, toad tires about 10lbs. Tire sensor temps generally run about ambient plus 10-12 degrees, but with great variation depending on sunshine, etc. Also, as others have noted before, my left front toad tire runs about 10 degrees hotter than others because its right in path of the diesel exhaust.
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On the road since June '12 with Lincoln, the guard cat.
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Old 03-18-2014, 04:52 AM   #4
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You are correct, it has been discussed. We just "googled" TPMS in iRV2 and found a days worth of reading....
Hal & Ginny Miller '04 Beaver Santiam PRT40
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Old 03-18-2014, 06:32 PM   #5
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TPMS Questions

Thanks for all of the response, and yes Mr. Miller there are pages of discussions on TPMS systems mostly as to what everybody thinks is the best. I was and still am trying to understand some information on what it is telling me etc. Example what is an excessive temp, today in 80 degree weather in Texas at 65mph I saw readings of 100 degrees on the sunny side of the trailer and coach.
Pressure wise I see psi increases of 10 or so psi after about 25 miles and then they stabilize but still wonder what is consider extreme pressure. i.e if a tire is 110 cold and raises to 120 is it in danger of failure or can it handle say 130 without issue.
2005 Winnebago Vectra, 2013 Ford Edge AWD toad, Jim & Barb along with our two Westie co pilots Maggie and Buddy
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Old 03-18-2014, 09:48 PM   #6
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Regarding excessive temp, the TST 507 installation manual states " we recommend you leave the temperature set at 157° Fahrenheit; tires typically fail between 180-200° Fahrenheit".

The same manual also recommends setting hi pressure to be about 20% higher than your normal operating pressure.


Fred & Vicki
St. Augustine, Fl.
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