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Old 04-21-2016, 11:00 AM   #41
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As a new TST user about to embark on a long trip, I certainly have appreciated everyones comments on this thread. Especially those of Tireman. Thank you all for a great discussion and a great learning experience dealing with tires and safety.
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Old 04-21-2016, 03:15 PM   #42
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Its the 75mph adj that is confusing. The 8008 (16" with Hispec wheels) have a max of 80psi and provide load of 3420. Since you cannot exceed 80psi, I was told a decrease of load by 10% was the acceptable safe alternate. So the 3420 max is reduced to 3078. Thus 4 tires with trailer weight evenly distributed would allow 13,680 trailer weight. A CAT weighing is required since some of the trailer GVW lies in the tongue carried by the truck payload.
EDIT: Escapees does individual weighings at each wheel for those of us that cant seem to figure out a load balance.
Okay, so when I weighed my 29RE, both axles were carrying 9460 lbs. (I honestly thought this weight would be higher) As of today, I do not know how that pressure is spread between the individual tires, so for my calculations, I used 11000 lbs to gain a reserve capacity. 11000/4 = 2750 per tire. According to the Maxxis load/inflation chart for my tire, the correct pressure would only be 55 psi. (yeah right) So, again, using their load/inflation chart and their guidelines in the email, I could add 10 psi to that inflation pressure and run 75 mph, or I could add 20 psi and run up to 85. Those numbers would allow me to run 85 mph with 75 psi in the tires. I will never tow that fast but that's what Maxxis states.

As I have posted before, my intentions are to run at a cold inflation of 80 psi. I am a little concerned with how high the pressures get after towing on the interstate for a few hours, but it's something I keep an eye on. It will be interesting to see how high the inflation pressures get when hot weather gets here. I'm sure that black asphalt in July/August will be well over 100 degrees F. So, I will be forced to do one of two things. (or a combination of) 1. raise the high temp alarm on the TST, and/or 2. lower the cold pressure in the tires.

Because I have changed more than a few blowouts on the side of an interstate, this is a very interesting topic for me, and I am learning a lot from several of the forum experts.
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Old 04-21-2016, 03:25 PM   #43
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Originally Posted by Medic97 View Post
As a new TST user about to embark on a long trip, I certainly have appreciated everyones comments on this thread. Especially those of Tireman. Thank you all for a great discussion and a great learning experience dealing with tires and safety.
X2. My TST system is arriving next week so this is very good and well-timed!
Thanks All.
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Old 04-21-2016, 03:34 PM   #44
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Forgot to mention, I do use the TST monitor. I have my high temp alarm set at 105deg. and I have my high pressure alarm set at 92psi. Just an FYI. I do adjust my driving habits according to outside conditions and ambient temps. It it's 105deg outside, I usually just drive at 65mph. If it's raining on a mountain road, go ahead and pass me 'cause I'm probably at about 35 or 45mph (or less).
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Old 04-21-2016, 04:10 PM   #45
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Forgot to mention, I do use the TST monitor. I have my high temp alarm set at 105deg. and I have my high pressure alarm set at 92psi. Just an FYI. I do adjust my driving habits according to outside conditions and ambient temps. It it's 105deg outside, I usually just drive at 65mph. If it's raining on a mountain road, go ahead and pass me 'cause I'm probably at about 35 or 45mph (or less).
Those are probably good settings, but be aware that the temperature reading on the TST and the actual tire temp are usually a world apart. I have a well built Klein infrared temp guage that I carry with me. Whenever we stop, that's the first thing to come out, and I'll check the temp of all 8 tires and hubs. During the summer, tire surface temps will easily hit 135 degrees F, and the hub a little cooler. As I understand it, the actual tire temp will be a couple of mm below the surface of the rubber at the outside corners. This is where the tire is flexed as it rolls. Before I stop, I'll check the TST which has been running around 84 deg F, and then I'll check with the Klein and temp will be around 108 +/-.

Thanks for sharing the data from your TST. That is good to know.
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Old 04-21-2016, 07:42 PM   #46
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105 seems awfully low for a high temp alarm. What is the default?


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Old 04-21-2016, 07:56 PM   #47
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I was told by TST that the default high temp was set to 158*. That is where mine is set.
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Old 04-21-2016, 08:38 PM   #48
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158 is also where mine is set, and that temp appears to be the lowest setting possible, but I understand there is a way around it. I just haven't gone to that trouble yet.

Having used mine a few times now, I've not seen the temps above 87. Granted it's not summer time yet, but the sensor is insulated from the rim by either a rubber valve stem, or by thick rubber washers on a metal stem. And, the sensor is out there spinning pretty fast at 60 +/- mph, so, even if it were to see the tire temps, it's being cooled off at a fast pace anyway.
In addition, the tires do not typically get warm where they seal against the rim. Tires are warmest at the side corners of the tire where the tread cap sits. About the only thing that might warm the sensor up would be a failing bearing, but that's not usually a long curve to failure. Once it starts, it's a fast, and self destructive event. Not always, but usually.

So, given all that, the temp sensor is almost useless as a predictive failure tool. At least that's my thought.

The pressure sensors however, are very useful technology.
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Old 04-21-2016, 08:41 PM   #49
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I would not get all wrapped up with TPMS temperature readings as in my experience they can be low by 20 to 50F.
Here is some info on real life temp measurement.
As you can see even expensive external IR guns do not provide the facts.

TPM sensors on metal stems are reading the temp of the air that has been cooled by outside air. Air is a great insulator so heat from the tire is not getting transfered to the TPM sensor.

I did a quick, low speed test and published the results. Note the cold ambient.

Use the TPMS to monitor PRESSURE as it was designed to be used.
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Old 04-21-2016, 11:02 PM   #50
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I would not get all wrapped up with TPMS temperature readings as in my experience they can be low by 20 to 50F.
Here is some info on real life temp measurement.
As you can see even expensive external IR guns do not provide the facts.

TPM sensors on metal stems are reading the temp of the air that has been cooled by outside air. Air is a great insulator so heat from the tire is not getting transfered to the TPM sensor.

I did a quick, low speed test and published the results. Note the cold ambient.
Use the TPMS to monitor PRESSURE as it was designed to be used.
Yep, and almost all the data in my last post came from Tiremans website. It's an excellent source of information to educate yourself. I learned a lot, yet I barely scratched the surface.

Tireman, thanks for making this information available. Helped me a lot.
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