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Old 01-29-2019, 08:01 PM   #1
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Tires... How hot is too hot?

In another tread I asked about tpms. Many of the folks keep a watch on their tires by tire temperature. Not wanting to chase this rabbit on the other thread and not know anything about tire temps I ask the question how hot is too hot to begin worrying about the tire wheel etc?
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Old 01-29-2019, 08:08 PM   #2
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I've been told the 160 deg F is the critical temperature where rubber starts to beak down.
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Old 01-29-2019, 08:17 PM   #3
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Originally Posted by rvethereyet View Post
Not wanting to chase this rabbit on the other thread
I know what you're saying about chasing those wasky ol' wabbit trails. I'm certainly not an expert on tire temps, but from all what I've read and experienced, including my TPMS manufacturer, most TPMS manufacturers set their high temp alarm—I believe—at around 155 or so as default. You shouldn't have any problem, especially if your tires are in good shape, cold pressure PSI is set correctly according to your weight and are not out of DOT date.

It's normal—especially in the summer time—for tires to increase 10-15 degrees or maybe a little more above "cold pressure" once under way. (with proper cold pressure PSI set at the beginning)

If you want to read everything you ever wanted to know about tires, go here:
RV Tire Safety

And yes, I'm one of those who watch my tires on my MH and toad like a hawk, but I watch PSI not temp. If any tire gets out of range I'll see it or the alarm goes OFF.

Good luck my friend.
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Old 01-29-2019, 09:13 PM   #4
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Thanks for the replies
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Old 01-29-2019, 09:21 PM   #5
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How hot is the asphalt?


How much weight are tires carrying?


Are all tires on same side showing same temps (close to)?


Does one tire run hotter? THAT is the one to investigate WHY
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Old 01-30-2019, 06:02 AM   #6
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Originally Posted by marjoa View Post

And yes, I'm one of those who watch my tires on my MH and toad like a hawk, but I watch PSI not temp. If any tire gets out of range I'll see it or the alarm goes OFF.

Good luck my friend.
Watching temps can let you see a pending bearing failure easier than watching psi IMO so I monitor both and watch for one tire that is different then the rest.
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Old 01-30-2019, 08:32 AM   #7
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Watching temps can let you see a pending bearing failure easier than watching psi IMO so I monitor both and watch for one tire that is different then the rest.
Yeah good point and yes I do monitor the temps for the same reason I just didn't mention it. Mainly because it's things like that (adding additional info) that cause some of these threads to go off into these endless, scientific, engineering arguments that has no end and quite frankly drive me nuts. I've learned to try to just answer the OP's question and not much more. That's just me.

But, all in all, I really keep my eye on all my PSI readings.
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Old 01-30-2019, 08:35 AM   #8
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You should consider that most TPMS's do not monitor the "tire" temperature. They monitor the temperature at the end of the valve stem which is rotating in free ambient air. So you never really get a valid measure of the temperature of the tire rubber or air within the tire.
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Old 01-30-2019, 10:40 AM   #9
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I would get yourself a very good IFR (infrared) heat gun, expect to pay between $50 and $90. The cheaper IFR heat guns have a higher +/- range on temps than the middle level price IFR heat guns and are not as accurate.

I check my tires when towing at every stop about two hours between stops. My tire temps between front and rear tires on the same side never vary by more than 3F between them. Which to me is normal. The tires in the sun side will be about 10 to 15F higher than the shade side of the trailer.

Once you establish a baseline than you know if you deviate form that baseline that you need to take action before tire failure. I have been towing this way for 40+ years and I have never had a tire failure when checking my tires this way.
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Old 01-30-2019, 11:42 AM   #10
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I check my tires when towing at every stop about two hours between stops






Just for conversation sake, about what temps do you see when you check it?
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Old 01-30-2019, 12:33 PM   #11
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I think it is worthless to debate any specific temperature because there are numerous variables, not the least of which is tire construction & materials, but also pressure and loading. The value in temperature monitoring is to spot changes and trends, not in some artificial limit. If your tires typically run at 140 on a hot summer day, and you notice one of them is 160, you most likely have a problem that needs to be investigated further. The tire itself is still fine, but you may have a bad bearing or hung brake caliper or shoe.


A rule of thumb might be that anything over 50 degrees above ambient is sufficient reason to investigate for possible causes. The tire isn't really in danger at, say 150 on a 100 degree day, but it's worth keeping a closer eye on it and maybe checking the brake & bearings in the near future.
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Old 01-30-2019, 12:40 PM   #12
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I think it is worthless to debate any specific temperature


For conversation sake....I'm curious. I don't care about what conditions may be affecting anything.
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Old 01-30-2019, 04:47 PM   #13
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My TPMS measures both PSI and temp. I read them and process the information based on the current conditions, weather, load etc.

When we stop for a break, I use the old hand check method to make sure things are calm around the tires and wheels.

I could see myself chasing this around and around like a dog chasing it's tail. So now I just relax and let the devices and my experience take over.
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Old 01-30-2019, 05:24 PM   #14
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I think it is worthless to debate any specific temperature


For conversation sake....I'm curious. I don't care about what conditions may be affecting anything.
The highest I have seen is 120 degrees on the sunny side and 95 on the shded side. That is in Florida running 60 MPH in the heat of the day. That's mine.
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