Go Back   iRV2 Forums > MOTORHOME FORUMS > MH-General Discussions & Problems
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 04-29-2010, 07:41 AM   #1
Senior Member
Join Date: May 2003
Posts: 291
Tire temperature

I assume some of you are using the various Tire Pressure Monitoring systems out there such as Pressure Pro, Hawkshead, TST etc

Most times you probably only look at tire pressure or use the alarm for tire pressure.
Has there been an instance when you had looked at tire temperature instead because the temperature alarm kicked in?
Example: The pressure going on the road was (say)115psi but the temperature was at (say) 200F and hence you had to pull over.

caymann is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 04-29-2010, 08:42 AM   #2
Senior Member
mythplaced's Avatar
Alpine Owners Club
Texas Boomers Club
Join Date: Jan 2009
Location: United States
Posts: 1,282
On my TST the tire temp has never gone over 125....

Michael (Home base Northern CO)
USED TO HAVE; 03 Alpine 40MDTS Now RVless
mythplaced is offline   Reply With Quote
Old 04-29-2010, 09:20 AM   #3
Senior Member
GaryKD's Avatar
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,533
Hi cayman,
Nope, only PSI does it for me.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 04-29-2010, 10:52 AM   #4
Senior Member
Join Date: May 2007
Posts: 632
I watch the temps at most stops for fuel or breaks. One time I noticed a tire that was about 40F hotter than the others. It had a slow leak and needed repair. I caught it before blowout time which saved me a lot of grief and expense.

Tire materials start to degrade at about 180F and should run at no more than 120F to 140F. The sunny side in desert conditions may run 10F to 20F hotter than the shady side in my experience.

If your tires run much below 120F, they may be a bit overinflated. This is not necessarily a bad thing as the only downside in nominal conditions is a bit of extra center tread wear and that isn't usually an issue as most RV tires need replacement due to age rather than mileage.

You can only reliably measure PSI when the tires are at ambient temperatures (i.e. after sitting for a few hours without the sun on them). The general advice is that should be done every morning while traveling.

Temperature can easily be measured with an IR device and is a good way to detect problems early while en route. If a tire runs hotter than the others it is saying it needs air.
BryanL is offline   Reply With Quote
Old 04-29-2010, 07:37 PM   #5
Senior Member
Join Date: May 2003
Posts: 291
The reason i ask this is, Smartire website says...LINK

As a tire deflates, its rolling resistance increases and its operating temperature goes up. As its temperature increases, the air inside the tire expands so the tire appears to be operating at correct inflation. When measured using a non-temperature compensated gauge, a tire can be 30% under-inflated and still appear to be normal.

So TPMS system that rely only on pressure is not going to be enough.
If you have a Pressure and Temp readout, the above situation can be avoided.
Is this correct?
caymann is offline   Reply With Quote
Old 04-29-2010, 11:08 PM   #6
Senior Member
Join Date: May 2007
Posts: 632
re: "As a tire deflates, its rolling resistance increases and its operating temperature goes up." -- this is true, which is why you can use temperature as an indication of proper tire inflation. Think 'sidewall flexing' as being the main source of rolling resistance. Less air and the sidewall flexes more and that generates more heat.

If the tire has no leaks, there will be an equilibrium point where the temperature stabilizes.

If the tire leaks, it will get hotter and hotter until it fails (unless you stop first).

The relationship between temperature and pressure in a leaking tire can be a bit complicated. If the leak is fast, the drop in pressure will be the first symptom. If the leak is slow, then temperature rise will be the first indication.
BryanL is offline   Reply With Quote
Old 04-30-2010, 09:20 AM   #7
Moderator Emeritus
Cruzer's Avatar

Join Date: Oct 2002
Location: Sheboygan, WI
Posts: 4,965
That's one of the reasons I went with the SmarTire system. As the tire heats up the air expands and the pressure increases. A TPMS that does not monitor temperature won't be able to accuratelty tell if the pressure is correct. Eventually, if there's a leak, it'll get there and warn you but not for a while. The nice thing about the SmarTire is that it reports pressure, temperature, and pressure differential. It uses temperature compensated logic to determine ehat the true air pressure should be at the current temperature.

For instance, a 98 PSI cold tire that should be properly inflated to 100 PSI is underinflated by 2 PSI. You drive down the road and the tire heats up to 90 degrees. The SmarTire now shows 102 PSI as the tire pressure. Tioggling through the display shows 90 degrees as the temperature and -2 as the pressure differential. So that shows that you should have 104 PSI, not 102 PSI at that temperature. As the tire continues to heat, say to 115 degrees, the pressure will increase to maybe 112 PSI but the differential will still remain at -2. The low pressure warning are based on the pressure differential so you'll still have a -2 PSI reading on the display wheras other brands will think it's just fine and actually 12 PSI over, which is false. Warning usually go off at 10% pressure loss so a competitive system probably won't warn you until it sees 90 PSI, which is about a 22 PSI drop (or more as the tire heats up from low pressure) rather than the 10 PSI recommended warning level.

I've never had the high temperature alarm go off. The main use of the temperature sensing is to create the dynamic temperature compensated pressure tables that the system uses (as previouslty explained). It acn have value in that it would report if a brake was dragging or a wheel bearing was going out because that heat would be transferred to the wheel rim. Although, the odds of that happening are slim.

I do check the temperature differential when driving just to see where Im' at. If a certain tire is -2 PSI I know that I need to add 2 PSI to it one of these days. I can then check it with a gauge and add 2 more to whatever is in it regardless of what the temperature is. I no longer have to make sure it's a 60 degree day and the tire has been sitting, out of the sun, etc.

Every now and then I check the tire temps when driving because it does tell me a thing or two about my tires. If one tire is hotter than the other there's a reason for it. Chances are the pressure I'm running in that tire isn't adequate for the load I'm carrying and it's working harder and getting hotter than the rest. Coaches are not symetrically designed. Batteries re on one side, LP tank on the other, fridges not centered, etc. I may need to readjust my tire pressures or get a good 4 point scale reading to see where I'm at. It also will vary a bit depending on the crown of the road. Heavily crowned roads will create more heat on the right side. The right inner dual is always hotter than the outer dual for that same reason - roads just aren't that flat.

Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon
Cruzer is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tires...country or origin??? teofff MH-General Discussions & Problems 6 03-15-2010 08:59 AM
Changed Tire Myself! GaryKD Class A Motorhome Discussions 45 09-29-2009 09:37 PM
Tire Pressure / Temperature on 2008 Essex Gene & Kaye Newmar Owner's Forum 10 09-10-2007 05:17 PM
Tire Sidewall Temperature bontemp MH-General Discussions & Problems 16 07-13-2007 06:59 PM
Temperature and altitude for checking tire air pressure? LK23 Winnebago Industries Owner's Forum 23 10-22-2006 10:45 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:12 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.