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Old 06-16-2021, 04:25 PM   #1
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Max Temperature

I have on our new camper Rainer ST ST 225 75/R15 Load range D tires

MFG says cold inflation is 65 lbs

I just got a TPMS and it has a setting for MAX temp. Where do I find that? Or if you know just clue me in, The default on the TPMS is 158 F
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Old 06-16-2021, 04:34 PM   #2
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Leave it on the default. No need to change it.
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Old 06-16-2021, 04:49 PM   #3
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On my eeze tpms system I set the max temp at like 120 I tires last week were running around 94 deg during a 3 hour trip at around 87 deg outside temp. If my temp on one tire rises more then 20 deg out of the blue I want to know right away. By 158 deg it may cause damage to the tire? I could be wrong but that was my thinking
I will double check what my max temp is set at if I remember tomorrow
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Old 06-16-2021, 05:06 PM   #4
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The idea is to keep an eye on the temps to see if anything is going bad on an individual tire. Could be getting hot due to a hung up brake, or wheel bearing seizing; things not usually related to tire pressure. Of course low tire pressures can cause the tire to get hot and eventually BLOW! We travel in the southwest desert where outside temps can get to 100. Tire temps can get to 110+. With higher temps the pressure also goes up. I'm told the manufacturers take this into account. Let's hope so.
Our TST brand TPMS is sensitive enough I can tell which side of the trailer the sun is shining on.
Just keep an eye on any unusually high temps compared to the other tires or an unusually low pressure reading. Alarms should sound but you can be ahead of the problem with just an occasional glance at your display.
IMHO the default high temp setting should be fine. Low pressure should be 10 to 20 pounds lower than your cold inflation pressure.
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Old 06-16-2021, 05:17 PM   #5
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Now you have me wondering.. I may be confused and thinking I set my max air pressure and not my max temp..I am gonna check tomorrow. Eeze recommends 158 as well..I hardly go 5 min without looking at the temps and pressures anyway
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Old 06-16-2021, 06:31 PM   #6
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I listened to a podcast recently and one of the guests was Roger Marble who, when asked about tire temperatures, said none of the TPMS devices could measure the temperature of critical parts of a tire, because the sensors can not be placed where the critical places are located. He said the only thing to be concerned with is the pressure. The 158 degrees noted in the manual for the TST TPMS manual IS what Michelin says is the safe top end temperature, so anything below that is OK.
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Old 06-17-2021, 03:26 AM   #7
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Surface temperatures of tires on a heavy fiver can easily reach 130-140 or more on a relatively warm day. I use the infrared EVERY stop and this is always 10-20 degrees hotter than the TPMS reads. As was stated, you are looking for the delta between the 2, 4 or 6 tires. If 3 read around 125 degrees and 1 at 145, it is time to stop and find the reason. Remember, TPMS will only give you the approximate temperature of the rim, not the surface of the tire. A combination of watching all three, pressure, surface temp and TPMS temp will usually keep you between the ditches.
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