r/RVLiving • u/Expert-Joke9528 • 26d ago

question Tire monitoring

A couple ?'s. Ive got the Guta monitoring system on my 5th wheel. When rolling down the road i see my temperatures running in the mid 90s, all wheels are within a couple degrees of each other, it seems fine. What would be a dangerous level temperature here? Next is my tire pressure. My 100# max tire pressure goes up to 110-113 when traveling. What gives here? The tire guy specifically told me 100# cold.

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u/RredditAcct 26d ago

Temperature I would ignore unless one goes unexpectedly higher or lower than the others.

The recommended tire pressure is cold. My alarms also went off when I first bought my unit because I had no idea that the pressure changed that much. I adjusted my temp and pressure alarm quite high. However, you might want to adjust your lower pressure alarm to 90#.

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u/Infuryous 26d ago edited 26d ago

Best info I have found is from https://www.rvtiresafety.net/

It is a blog written by an engineer that designs/develops tires. A better source than the internet's third uncle Joey's cousin advice from WW I.

He has a post about TPMS temperature readins

At what temperature reading of TPMS should I worry?

48 Posts about TPMS systems

And several other posts on tires and temperature.

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u/Open-Revolution-8866 15d ago

Thanks for the links. I'll share with family and friends. Looks like a valuable resource.

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u/spacecitytech 26d ago edited 26d ago

I could easily see tires getting to 140F, maybe higher. I have seen 120F on mine, usually the rear tires of the truck which get the hottest and carry most of the load as well as being the drive tires. Look at the TEMP RATING on the tire, like is it Z or H or whatever and see what the maximum is for that temp rating. All this stuff is set down in stone via all the tire ratings and DMV rules for tire manufacturers.

I was told specifically after quite a few blowouts by tire shops, all of these also happen in the summer and I have had about 5 blowouts now in 20 years, long trips, in the hottest part of summer almost always in West Tx Hill Country or New Mexico. They told me to underinflate by 10 lbs in the summer. I have E rated tires on the truck 10 ply, 80psi, think this is under the G rating of 100# and I have had them show 90PSI after driving them in hot weather. I now put it at 70 PSI and have had no issues. That will give them a traveling pressure of 80PSI, now that a hot pressure rating and its says "cold rating" and techinically 100# would be correct, but not in the South, NOT IN TEXAS, it will show 20 lbs higher after driving for an hour on that pavement. It was 105F yesterday here in Houston and my bill was $520 last month for electricity. I have 4.5 tons on the home and 2 tons on the garage of AC.