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Hot tires?

Yahoo Message Number: 17183
Smartire shows the back tire temperatures at 148-157 degrees F. Is this too hot? If not, I wonder what is too hot. Temperature outside was 93. Anyone have any comparison temperatures? Thanks for any insight.

Larry, Debbie, Tiki and Tomi
USAF Retired

2003 36' Allure #30856

Re: Hot tires?

Reply #1 –
Yahoo Message Number: 17184
Those temps are definitely not too hot. You might want to check the alarm temps set up on your Smarttire unit. Mine, per Schwab recommendation, are set at 198 F. You should have a book which shows you how to check all of the alarm parameters, and if you have questions the folks at Schwab in Junction City are happy to help you.

Walt Rothermel
03Allure30811

Re: Hot tires?

Reply #2 –
Yahoo Message Number: 17186
Larry,

The temperature of your tires depends on the air pressure. We run our rear tires at 105 psi and the temp never goes above 135. This Tire pressure is about 10 pounds above what the book says for our weight. Your temp sounds OK but I believe it should be lower, thats why we carry more air then the book says. Your Smart Tire is set to alarm at about 195 degrees but I am not sure of that. You need to read the Smart tire book for the exact readings and I can't remember. At 135 degrees I don't worry about the temp. I will say that your inside dual will run hotter then the outside dual and your car tires will not run as hot as the coach tires. If you have not weighted your coach on a 6 or 4 point scale, do that and you will know what the air pressure should be and feel more comfortable with you Smart Tire. Because most people do not do this the tire manufacturers have started saying to carry the maximum air. I'm from the old school that says weigh your coach and run the tires 10 pounds over what you should use. But never go below 85 pounds. Never had a blow out since started doing this in 1993.

Bill g. 2005 Magna #6425

Re: Hot tires?

Reply #3 –
Yahoo Message Number: 17198
With SmartTire, one has to remember that it is measuring the temperature of the wheel -- metal being a better conductor of heat than air in the tire. For the inside duals, it is picking up the radiated temperature of the brake drums (on my 2002 Allure) more so than the tire rubber temperature. If I see my inside duals go above 150 degrees, I know I am using (have used) my brakes too much. It has reached 185.

I often wonder how those batteries in the sensors survive the high temperatures. When tires are replaced, I understand that it is a great time to replace the battery in each sensor. What battery # and

who carries them?
Herb

2002 Allure #30690

Quote from: Larry Feather

hot tires

Reply #4 –
Yahoo Message Number: 17187
Larry, just returned from a trip with temps in the 90's and checked my

tire temps with an infared temperture gun and the highest temp I saw was 143 on the inside duals. I run 110 psi rear and 115 front and the temps were fairly even side to side.

John Magna #5752

Re: hot tires

Reply #5 –
Yahoo Message Number: 17188
Great! Thanks to all for the replies.. I'm running the duals at 100 PSI, but am thinking of going to 110 for GPs. I haven't weighed it yet, but know from factory weigh sheet that my right rear is heavy.
John, just for information, I have compared tire temperatures between Smartire and infared and noticed the the infared showed about 10 degrees less than Smartire.

Incidently, both front and rear axles on my coach are actually rated for 1000 lbs more than what CC rated them at. CC calls it "conservative engineering." I noticed this when lubing the chassis and saw the data plates on the axles. Thanks again.

Larry, Debbe, Tiki and Tomi
USAF Retire

2003 36' Allure #30856

Quote from: odie101547

Re: hot tires

Reply #6 –
Yahoo Message Number: 17189
I'm currently on the road with my coach, just drove across Iowa today. Ambient temps in the high 80's to low 90's. Pulling my toad, running 60 to 65 mph and tires checked out from a low of 131 to a high of 139 degrees. I have used this method for years and it has always worked for me. The tires on the toad were around 115 degrees. These temps don't really mean anything in themselves except that checking them over many times starts to give you a picture and an exception would certainly send up a warning flag. Don't really bother to check the inners regularly but when I do they tend to be higher naturally.
Ron

98 Allure 30185

odie101547 wrote:

Re: hot tires

Reply #7 –
Yahoo Message Number: 17190
Been reading many posts today on hot tires and finally have some time to provide some input to this thread.

I talked with the Toyo techncial guy about pressures and weight.
Though this thread does not specifically talk about pressures there were some references. The tech said that the charts are the MINIMUM pressures for a tire based upon the corresponding weight. I had not seen anyone mention this thus far in the various tire pressure discussions. Second, they recommend that you run the tires at a higher pressure than that listed on the chart because it provides a level of safety in case something happens with the tire, like it starts to loose air quickly. I talked with him about the max pressures and they recommend this and did not feel there was any issue running at 120 PSI (cold) for the Toyo M120 for example. I did mention that I measured my weight and wanted to lower the pressures but he still felt it was best to run them at the higher pressure.

Now about the tire temperatures, I noticed that a few of you are measuring with infred. This is very inaccurate as this is reading a surface temperature that cools very quickly. For those that are using the silver leaf tire temp and pressure, I am not aware of the details of how they are reading the tire temperature form the inside, but the real heat that builds up in a tire is in the tread body. Over heating the tread body causes delamination issues when over heated which obviously will be a big problem for use motor coachers.
The solution is to use a pyrometer that is of the probe type so that you can measure the rubber in the tread body which is where the actual reading should be taken. If people are using other readings like the surface type this will be lower than the actual reading and depending upon how long before you stop and take the temperature will also provide an incorrect actual temperature as compared to actual driving conditions. All this information has been formed from the many years of sports car racing and seeing how tires react to temperature.
I am insterested in the silver leaf tire temp/pressure unit, but I am not sure it is really that accurate, though I am sure it will warn you to relative changes instead of just finding out once the tire fails.

Quote from: Ron Schonscheck\[br\
] > I'm currently on the road with my coach, just drove across Iowa today.
Ambient temps in the high 80's to low 90's. Pulling my toad,

running 60

Quote
to 65 mph and tires checked out from a low of 131 to a high of 139 > degrees. I have used this method for years and it has always worked

for

Quote
me. The tires on the toad were around 115 degrees. These temps don't > really mean anything in themselves except that checking them over many > times starts to give you a picture and an exception would certainly

send

Quote
up a warning flag. Don't really bother to check the inners regularly > but when I do they tend to be higher naturally.
Ron

98 Allure 30185

odie101547 wrote:
> > Larry, just returned from a trip with temps in the 90's and checked > > my

> tire temps with an infared temperture gun and the highest temp I saw > > was 143 on the inside duals. I run 110 psi rear and 115 front and the > > temps were fairly even side to side.
>

> John Magna #5752
>
>
>
>
Quote

>

> * Visit your group "Country-Coach-Owners > >http://groups.yahoo.com/group/Country-Coach-Owners>" on the

web.

Quote

> * ">Country-Coach-Owners-unsubscribe@yahoogroups.com > >
Country-Coach-Owners-unsubscribe@yahoogroups.com?subject=Unsubscribe>

Quote

> * >.
>
>
>

Re: hot tires

Reply #8 –
Yahoo Message Number: 17214
Ron,

The Silver Leaf is reading temperature and tire pressure from smart tire sensors. they have just eliminated the little Smart tire screen. on the dash.
While we are talking about tires, I just saw some new CCs at Lazy Days with the new Goodyear tires which take 130 pounds of air to handle 9000 pounds. There were also some new CCs with the Toyo tires with interesting labels in plain view on the tires. The label said for NORTH AMERICA, maxium speed 65 MPH. For those the don't believe this speed rating take a look at the new Toyos. Could not find the rating on the new Goodyears.

Bill G. 2005 Magna #6425
 

Re: hot tires

Reply #9 –
Yahoo Message Number: 18559
Quote from: gablerwh@a\.\.\.

Ron,

The Silver Leaf is reading temperature and tire pressure from smart

tire

Quote
sensors. they have just eliminated the little Smart tire screen. on

the dash.

Quote
>

While we are talking about tires, I just saw some new CCs at Lazy

Days with

Quote
the new Goodyear tires which take 130 pounds of air to handle 9000

pounds.

Quote
There were also some new CCs with the Toyo tires with interesting
labels in plain

Quote
view on the tires. The label said for NORTH AMERICA, maxium speed

65 MPH. For

Quote
those the don't believe this speed rating take a look at the new

Toyos. Could

Quote
not find the rating on the new Goodyears.

Bill G. 2005 Magna #6425

Bill,

The Goodyear G670 RV are rated at 75mph. Tire speed performance ratings indicate the max speed the tire is designed to run.
Consistent driving above those ratings means the tire/s will carry LESS load. This due to the increased flexing of the steel body plies and the increase in heat. So for tires rated and 65 and owners that continues to run at 66 or higher, this can translate into potential tire problems.

Also, the Goodyear tires are NOT truck tires where the Toyos ARE truck tires. Advantage Goodyear becuase the Goodyears disipate heat faster- run cooler -(less tread mass) and run smoother (less tread reduces tread squirm).