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Old 08-24-2015, 10:11 PM   #1
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A/S Wheel Temperature Question

I bought an after market TPMS system for my A/S and TV. It is nice to be able to know that the pressure is being monitored but I also get wheel temperature readings as well. Today the ambient temperature was 80F. After an hour of driving the wheel temp got up to 120F.

What is the normal range for wheel temperatures?
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Old 08-24-2015, 10:35 PM   #2
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That sounds about right. I measure my tire surface temperature with a laser IR thermometer and on a hot day they usually run 115 to 120.
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Old 08-24-2015, 11:12 PM   #3
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That is warming quite a bit..

Have you read this?
RV Tire Safety: Tire Temperature & Pressure - A Hot Topic
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Old 08-24-2015, 11:20 PM   #4
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I checked mine after an hour on the interstate a couple of weeks ago. It was also 80-85 degrees. My hottest tire was 110.
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Old 08-24-2015, 11:31 PM   #5
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I use TST stem mount system on 28ft FC with 80psi Michelin 16" LT E @65-70 mph. Tires always run 5-10 degrees above ambient in summer (90-100 degree temps) with tires on sunny side usually 3-4 degrees above shade side and psi gain of about 5 over cold. Front axle tire trmp is generally 2 degrees higher than back axle, side to side is same except for stated sun effect. Cold weather (30-40 degrees) temp increase about 5 degrees, really not all that much different.
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Old 08-25-2015, 05:41 AM   #6
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Replies 6 and 7 in this thread: http://www.airforums.com/forums/f438...nt-119498.html were posted by 2 of the forum's tire engineers when I asked a similar question. Good luck!
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Old 08-25-2015, 08:07 AM   #7
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Tireman references his blog. Do you have a link to that?
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Old 08-25-2015, 08:13 AM   #8
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A/S Wheel Temperature Question

I'm not 100% sure but I think it might be this one: http://www.rvtiresafety.com/?m=1

Maybe Tireman9 can confirm?

(Edit - he emailed or PMed it to me once and I can't find it - I never remember to save sites as favorites - I just googled Tireman9 blog and this looked reasonable &#128563
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Old 08-25-2015, 08:29 AM   #9
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Monitoring with a TST system my tire internal temps usually go up 5 to 10 degrees. Ambient temps recently have been in the mid 90's.
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Old 08-25-2015, 10:54 AM   #10
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Thanks to everyone for the quick responses and links. When I was researching TPMS units there was a note somewhere in this forum about using the TPMS temperature readings to warn of a wheel bearing that is going bad. I cannot find a post that discusses what the temperature profile would look like if a wheel bearing was heating up. Any ideas?
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Old 08-25-2015, 11:03 AM   #11
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Quote:
Originally Posted by Eagle & Bear View Post
Thanks to everyone for the quick responses and links. When I was researching TPMS units there was a note somewhere in this forum about using the TPMS temperature readings to warn of a wheel bearing that is going bad. I cannot find a post that discusses what the temperature profile would look like if a wheel bearing was heating up. Any ideas?
A dragging brake can overheat the wheel... then the tire. Not just the hub which is usually a bearing/lube issue.

You should be able to hold your hand on the Hub if it is running properly.
Same with the wheel... but, start from the outside of the wheel near tire and work your way to the hub. If too hot, you will know it.

One quick check will be to jack up the trailer until tires are of the ground. Now, spin the tires... do you hear any noise? Rock the tire back and forth like trying to pull it off the trailer then push back.. how much does it move? too much slack/endplay can indicate a problem.

Since you are FT... keeping up with the status of each wheel is important...

Let us know what you find...
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Old 08-25-2015, 01:07 PM   #12
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16" Michelins inflated to 75 psi and the two axles are supporting around 8,200 pounds. One tire around 1,950 pounds and another is around 2,150 pounds with the other two around 2,050 pounds. Pressure rises about 8 to 10 psi and temps about 10 to 15 above ambient.
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Old 08-25-2015, 01:34 PM   #13
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16" Michelins inflated to 75 psi and the two axles are supporting around 8,200 pounds. One tire around 1,950 pounds and another is around 2,150 pounds with the other two around 2,050 pounds. Pressure rises about 8 to 10 psi and temps about 10 to 15 above ambient.
Switz: The sidewall recommended cold inflation pressure on my 16" Michelins reads "80 lbs." I note that you stated you used 75 lbs. Is there some reason you are running 5 lbs below the recommended cold pressure?
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Old 08-25-2015, 01:53 PM   #14
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The operational temperatures and pressure gain are less at 75psi. Since on average the tires are supporting 2,100 pounds, I think 75 psi is the correct pressure for MY trailer. See pressure table below for the Michelin LT225/75R16/E LTX M/S2 tires. That pressure and load rating is still a 20% buffer above the actual payload.

80psi 2,680 (E)
75psi 2,560
70psi 2,440
65psi 2,335 (D)
60psi 2,190
55psi 2,060
50psi 1,940 (C)
45psi 1,790

I think the trailer rides a little easier as well.
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