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Old 08-17-2014, 09:20 PM   #1
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Another dumb tire monitor question..

I read how great the tire pressure monitor systems are. Some claim to tell you when the tire temperature rises. If I get the screw on type, how do they measure the temp inside the tire?

Thanks, Leo
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Old 08-17-2014, 09:23 PM   #2
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They don't, for tire temp you need to install the internal type of monitor. The screw on ones only monitor air pressure of the tire.
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Old 08-17-2014, 09:23 PM   #3
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They measure the temp of the inside air via the valve stem.
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Old 08-17-2014, 09:28 PM   #4
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For temp readings you need steel valve stems that will conduct heat from the tire. As the rubber heats it conducts heat to the wheel then the valve stem. They are not perfectly accurate but you see if one is running hotter then the others or shows a continual rise that may indicate a problem. Tires on the sunny side can run as much as 10 degrees higher. Not all monitor temps but my TST system doesm
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Old 08-17-2014, 09:49 PM   #5
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Quote:
Originally Posted by Engle View Post
I read how great the tire pressure monitor systems are. Some claim to tell you when the tire temperature rises. If I get the screw on type, how do they measure the temp inside the tire?

Thanks, Leo
LEO......The only dumb question is the one you don't ask.

Most of the TPMS systems that give a temp indication will show you relative temps (from one tire to the others), or trends- a sharp increase on a particular tire perhaps.

To get an accurate read on the critical tire temp you'd need an internal sensor embedded in the rubber of the sidewall near the shoulder. I don't know if anyone does that.
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Old 08-17-2014, 10:20 PM   #6
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I have the Smartire system (internal sensors) in both the motorhome and toad and I wouldn't want to be without the information (temp, PSI, etc.) it provides. Unfortunately Smartire was purchased by Bendix and they dropped the RV applications (sensors are still available, though).

Another manufacturer with a similar product is Valor Our Product
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Old 08-18-2014, 07:27 AM   #7
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They don't, for tire temp you need to install the internal type of monitor. The screw on ones only monitor air pressure of the tire.
BAD information!! Most newer systems have a temp. function... The temp reaches the screw on sensor thru the air in the air filling system.
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Old 08-18-2014, 07:55 AM   #8
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The screw on types like Pressure Pro measure the temp of the valve stem If it is a metal (Steel) stem then that will be the temp of the rim it's bolted to or close enough to not matter.

If it's a rubber valve stem (Towed) it can only measure the air near the tire, This may still be enough to alert to issues. key word MAY.
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Old 08-18-2014, 12:44 PM   #9
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I know this is a little off topic but,does anyone have a feel for how much pressure increases as temperature increases as you drive.
Like a percentage figure.
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Old 08-18-2014, 01:29 PM   #10
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I know this is a little off topic but,does anyone have a feel for how much pressure increases as you drive.
Like a percentage figure.
On my tires set at 100 -105 pounds the psi on a hot day will go to about 115 so my guess is about 15%. Interesting different tires set at the same psi will show different pressures - could be the sending unit or the tire positions (I guess)
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Old 08-18-2014, 01:36 PM   #11
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Thanks Bob
That's what I'm getting on my tireminder. Just curious what others are getting.

Rick
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Old 08-18-2014, 02:59 PM   #12
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My 90 lbs will go as high as 115 in very hot weather.
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Old 08-18-2014, 03:03 PM   #13
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Wayne

I get that sometimes too +20% and that sets off tireminder alarm..
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Old 08-18-2014, 04:12 PM   #14
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Quote:
Originally Posted by Angler3041 View Post
I know this is a little off topic but,does anyone have a feel for how much pressure increases as temperature increases as you drive.
Like a percentage figure.
Here's probably more information that you asked for:

Gay-Lussac's law - Wikipedia, the free encyclopedia
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