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Old 02-24-2016, 08:55 AM   #1
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Tire temperature?

I measure my wheel & tire temperatures with a IR pyrometor. My original reason was to see if the brakes were all working the same or it one was dragging. However, thought I'd measure the tire temp because of running the tire at about 90% of max. rating. So, after long (150 - 250 miles) freeway runs, I'd measured between the lug nuts, get 75 - 80* and the tires (at the widest section of the side wall) about 93- 97* on all 4 tires, ambient temp about 55 or so. Then I check my truck tires...they measured about 70 - 75*. I performed this at 2 stops on one trip. On a previous day trip, one side measured 115* on tire temp, while the other measured in the 95*...wheels about the 77* range. Now the sun was shinning nicly that day. Feeling that my pyrometer gone goofy, I cheched with my hand...and yep the one side was hotter.
Two reason for posting...bit confused on why 115* on one side, and the other 95*. then the next day both reading the same at 95*, but it was more overcast. Then the big difference in truck tires vs 5ver tire temp. I my mind the 5ver tires are working harder...making more heat. I know we have some tire engineers, tire consultants and RV tire sales guys that know alot about this stuff...just looking for some feedback.
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Old 02-24-2016, 10:11 AM   #2
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I've been shooting my tires on my coach and toad about 6 years every time I stop anywhere.

You will see a lot of variance depending on sun, wind and rain. What I look for is a tire that is consistently higher than the others over the day. A hotter tire indicates a lower tire pressure.

Those temperature differences you saw were not unusual for a sunny day.

Keep on shooting them and you will develop a feel for what is OK.

The other good thing about shooting your tires is that you are doing a walk around and may catch something that is amiss.

I occasionally will shoot 18 wheeler tires that pull in next to me.

Their tires are usually cooler than mine and I believe that is because truck tires don't flex as much as RV tires.
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Old 02-24-2016, 10:13 AM   #3
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Just one comment, since you can't check the temps without stopping, then brakes may make a difference. The truck probably has disc brakes while the trailer most likely has drum brakes. So, that could result in higher readings for the trailer tires. Also, the wheels will cool down faster than the tires, so how quickly you take the readings and the order you take them matters. Not sure if this helps, just some thoughts. On my trailer I have internal sensors with my TPMS and get temps w/o stopping which I feel has a better chance of detecting wheel bearing or brake shoe issues.
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Old 02-24-2016, 08:28 PM   #4
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Tire temps differences side to side on a tall boxy trailer may be from;
side winds
crown in the road
one side in the sun
brake dragging
bearings need looking into
low tire pressure on that side
tread belt delam
minimum tire pressures for the load from a tire pressure chart

Pulling in windy areas with strong side winds are tough on the lee side tires. I've read where big rig truck tires can run 40 percent hotter on the lee side than the other side.
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Old 02-24-2016, 08:57 PM   #5
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115* on a tire is nothing to worry about. The sun will make sometimes as much as 15 to 20* difference. The trailer will almost always read higher than the TV due to being loaded more. To give an example, my trailer tires run between 115 and 140* depending on ambient temperature while the TV tires run between 95 and 120*. While this seems high, remember that I have a GCW of right at 25,000#.
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Old 02-24-2016, 09:25 PM   #6
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The TST TPMS system says to leave the temperature sensor alarm at 158. As I remember from some reading tires are good to at least 200 internal before you should worry
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Old 02-24-2016, 09:49 PM   #7
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One day sunny......so tires on sunny side will run warmer
Next day overcast......tires close in temps which is an example of how much affect the sun has on tire temps

Truck tires vs trailer tire temps........difference in load on tires. Higher load/more resistance/ higher temps

IR guns are a great tool but should be used on tires/drums/bearings/rotors to get a 'trend' on temps
Temp readings are affected by where temp is taken and distance used.



Quote:
Originally Posted by Franka548 View Post
115* on a tire is nothing to worry about. The sun will make sometimes as much as 15 to 20* difference. The trailer will almost always read higher than the TV due to being loaded more. To give an example, my trailer tires run between 115 and 140* depending on ambient temperature while the TV tires run between 95 and 120*. While this seems high, remember that I have a GCW of right at 25,000#.
Frank

I see similar temps on my truck/trailer tires as 'Frank'
Truck & 5vr GCW 22K
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Old 02-24-2016, 10:45 PM   #8
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Old-Biscuit said:

"IR guns are a great tool but should be used on tires/drums/bearings/rotors to get a 'trend' on temps"

I agree. I check all those items plus my rear end (differential) and have developed a feel for what I should be seeing.

You can also check your exhaust system and find any blockages based on the temperature of the exhaust pipes up to the muffler or catalytic converter.
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Old 02-25-2016, 08:54 AM   #9
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thanks all...I feel good that I was not crazy with the +25* temp difference!
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