driveby wrote: for temps I think the actual number is less important than the delta between cold and blow out and the delta between each tire. IE if you stop and all tires are mostly the same temp and then stop again and one tire is significantly different (likely higher) that would be a cause for concern. IMHO 1 or 2 degrees is rounding error, 10 degrees would make me think. 20 degrees would have me calling Coach Net
Driveby I totally agree. The case where the guy caught the dragging front brakes with the TST TPMS had readings of like 130 and 140 with 100 at the rears. When he lifted his front tires off the ground they would not turn freely. Normally they all will read within a few degrees.
Looking for differences is why we like to check the PSI/Temps about every hour when traveling plus it helps keep us alert and focused to what we are doing.
In "my" instrument I could set a new null any time I deemed desirable.
A 'normal' temperature would be selected by the operator, after traveling an appropriate number of miles, then he would select some higher temperature at which he wants the alarm to go off.
* This post was
edited 07/03/09 10:00am by Cloud Dancer *
Willie & Betty Sue
Miko & Sparky
2003 41 ft Dutch Star Diesel Pusher/Spartan
Floorplan 4010
Blazer toad & Ranger bassboat
According to Bridgestone Tire Company in response to a question about tire temp sensors installed in aluminum wheels:
"a general rule of thumb is that a properly inflated/loaded timre, when up to operating temperature - one hour or more of operation - will typically run about 60 degrees F hotter than the ambient temperature. Anything above 200 degrees F could lead to tire degradation and you need to investigate for a problem."
Bridgestone Tire Company also says the following regarding surface/tread temperature (which you would see if you use an infrared thermometer):
"While there are many factors, such as ambient temperature, load, speed, air pressure, wheel position and tire pattern that will determine the tread temperature of a truck tire in normal operating conditions, we normally experience surface tread temperatures in the range of 150 to 180 degrees F."
They also note that the ribs will be cooler than the grooves and the center will be cooler than the shoulders.
Michael Day
Newell Coach
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Fulltimingman wrote: According to Bridgestone Tire Company in response to a question about tire temp sensors installed in aluminum wheels:
"a general rule of thumb is that a properly inflated/loaded timre, when up to operating temperature - one hour or more of operation - will typically run about 60 degrees F hotter than the ambient temperature. Anything above 200 degrees F could lead to tire degradation and you need to investigate for a problem."
Bridgestone Tire Company also says the following regarding surface/tread temperature (which would would see if you use an infrared thermometer):
"While there are many factors, such as ambient temperature, load, speed, air pressure, wheel position and tire pattern that will determine the tread temperature of a truck tire in normal operating conditions, we normally experience surface tread temperatures in the range of 150 to 180 degrees F."
They also note that the ribs will be cooler than the grooves and the center will be cooler than the shoulders.
Thanks for your post. I knew I had read the 200 degree number somewhere. We find the TST system reads about more or less 15 degrees lest than shooting the rubber.
Do I assume that if my tires are not hot during running they are adequately aired up. My tires run very cool at the max pressure. Can I let some air out and enjoy a smoother ride?
"a general rule of thumb is that a properly inflated/loaded timre, when up to operating temperature - one hour or more of operation - will typically run about 60 degrees F hotter than the ambient temperature.
So technically you could set your air pressure by monitoring temperature. If the tires are heating more than ~60 degrees, then you need more pressure. If its less, you are overinflated.
I've heard someone explain that you can set your tire pressure based on how much the tire increases. In otherwords, the tire should increase by X% after driving for an hour. I thought I remember it being 15%, but don't trust that info.
Dave
FMCA F298817
'83 Revcon Prince 31' FWD
502 w/Howell/Edelbrock MPFI, Thorley's & Magnaflows,
Koni FSD, Class A built for gear heads ?????? Revconeers Forum
There is nothing compassionate about taking someone elses money and giving to the poor.
"a general rule of thumb is that a properly inflated/loaded timre, when up to operating temperature - one hour or more of operation - will typically run about 60 degrees F hotter than the ambient temperature.
So technically you could set your air pressure by monitoring temperature. If the tires are heating more than ~60 degrees, then you need more pressure. If its less, you are overinflated.
I've heard someone explain that you can set your tire pressure based on how much the tire increases. In otherwords, the tire should increase by X% after driving for an hour. I thought I remember it being 15%, but don't trust that info.
It would not work for me, because I insist on keeping the 'recreation'
part of RVing intact. That's why I invested in being able to keep my MH in my backyard, with full connections. I like to take my time, whenever I'm prepping for a trip. One of the final steps is to check the tires and add a few pounds of air (if required). And, I would enjoy watching the tire temperatures come up as soon as I hit the road (if I had my 'dream' instrumentation).
I can not imagine how it would work better/handier if I were setting the initial air pressure by heating the tire first.
Jerry B wrote: Do I assume that if my tires are not hot during running they are adequately aired up. My tires run very cool at the max pressure. Can I let some air out and enjoy a smoother ride?
Of course you can, I lowered mine from 90lbs to 70lbs and let me tell you, the ride improved considerably, if you have driven on the CA freeways much, you know what I'm talking about. I have one of those infrared devices, but checking with your hand will give you a pretty good idea, check them with the higher pressure, then with the lower pressure.
* This post was
edited 07/03/09 09:26pm by semiretiredDIY *
Compressor looks to me like a little over kill as I use my 150- PSI -6 gallon Sears unit that is much small than what you have. I too have a digital air gauge as well as an analog gauge. We run pressure pro on all 10 wheels when traveling.
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