Tire Pressure

[Grandpappy]

Tire Temperature

I'm running the Smart Tire system on my 34' 5er that allows me to read tire temp. and press. from the cab while rolling. It can be set to give me low press. warning/alarm and high temp. warning/alarm. Problem is, what is too hot? No tire mfg. I have talked to can/will tell me what the max temp is on their tires. I have Goodyear Wrangler HT 235-85r-16 E-load range, (with circle s). I have seen as high as 148* running 65mph and 99* outside temp. Sure could use some help on this, don't want to throw cap on one of these POS Goodyears or worse yet blow one out.



TIA... ... ... Howard

 

[rickhans]

I have never considered a tire monitoring system like you have, but I would think that it would be useful only to know if you are losing air pressure due to a nail or something. It is my understanding that if you air your tire while cold to the max pressure shown on the tire, that it does not matter how much the pressure increases as the tire gets hot. I would think that all tires are designed to withstand the high heat generated on hot asphalt in Texas and other areas that are even hotter.



However, I know from experience that some brands will not. I went thru 2 complete sets of tires on my diesel 4x4 Suburban in 3 years because they would blow out in the summer when towing. I gave up after the second set. I now buy only Michelins or Goodrich all terrain tires for my trucks. I have never had a Michelin or Goodrich blow out on a hot highway.

 

[Grandpappy]

I agree the Smart Tire system is great for detecting slow leaks and warning of low air press. , however, since it also detects high temps. , without the "whats too hot" figures from the tire mfg. , I have a piece of info. I can't use. I really think that heat, for whatever reason, was/is the cause of the Firestone tire failures. I have lost one cap on a Goodyear without the little s in circle and really think temp. was cause. Tire still had 85# air in it with no cap when I changed it. Also caused ~$700. damage to trailer, this I want to avoid from happening again... ... ... ... ... Howard

 

[RADdodge]

Grandpappy - Where did you buy the SmartTire system? Looks like you have it installed on your 5er but not your rig? How do you know which wheel is where? What if you changed wheel positions? Sorry for all the questions, but I'm interested in it for towing my jeep. Thanks.



I know what you mean about tire manufactures not wanting to give additional details about their products other than what they publish. Never have seen a temperature rating. Probably because, up until now, the only thing a consumer could do was check the pressure.

 

[Grandpappy]

Bruce R. I got my SmarTire System from Discount Tire here local. They are one of SmarTire's approved installers and also less expensive than from the co. The sensors in the tires (attached to wheel by s/s band) are all different freq. so the monitor knows where they are at. Life span of batteries in sensors is greater than 5 years they say. The monitor is 12v powered from cig. plug.

You can rotate tires and reprogram the monitor so it knows where the tires were moved to. I can't find the ph. no. for SmarTire Inc but they are in Akron, Ohio, you should be able to find them on net with a search. Yes, I only have the system on 5er for now but truck is next and soon. If anyone needs more info please feel free to e-mail me, I will try to find the 800# and post it if I find it. When I bought mine 2 yrs ago, the cost installed was less than 4 big bills.



I haven't given up on getting temp. rating from tire mfg. yet. If anyone comes up with answers, please e-mail me. Going to be traveling but can read e-mail on road at least 2-3 times a week.



Howard

 

[Hokey]

Originally posted by Bruce Radford

Grandpappy - Where did you buy the SmartTire system? Looks like you have it installed on your 5er but not your rig? How do you know which wheel is where? What if you changed wheel positions? Sorry for all the questions, but I'm interested in it for towing my jeep. Thanks.



I know what you mean about tire manufactures not wanting to give additional details about their products other than what they publish. Never have seen a temperature rating. Probably because, up until now, the only thing a consumer could do was check the pressure.

Bruce,



http://www.smartire.com/fl/na/products/index.html

here is the site I was just checking it out yesterday neat stuff.

Hokey

 

[WestTN]

tire temp?

I seems to me a better approach would be to weigh the truck to get individual wheel weights, properly inflate the tires for the load they are carrying and then measure the temperatures they operate at. If you then see an increase, you can bet something is wrong.



In NASCAR racing it is common to measure tire temperatures. I think they run temps well into the upper 200's, BUT I am not sure of that and they are obviously running on the edge anyway.

 

[Hokey]

Re: tire temp?

Originally posted by WestTN

I seems to me a better approach would be to weigh the truck to get individual wheel weights, properly inflate the tires for the load they are carrying and then measure the temperatures they operate at. If you then see an increase, you can bet something is wrong.



In NASCAR racing it is common to measure tire temperatures. I think they run temps well into the upper 200's, BUT I am not sure of that and they are obviously running on the edge anyway.

absolutley, I agree with you 100%. I think there is more info at smartire's site. It seems to me the main reason this system measures temp is the relationship to pressure (Gas Laws)

anyway cool Idea.

 

[Grandpappy]

I know the scale weight of each wheel on my trailer, the tires are inflated cold to the pressure taken from chart put out by the Tire Mfg. Assoc. +5#. I know of the "gas law", the higher the temp. , the higher the press. so how high is too high/how hot is too hot. Before I got the smartire sys I have had real damage done to my 5er due to tires throwing caps which were still fully inflated when I got stopped. In each case they were about 90# which I have found to be a normal rise on a hot day from the 80# I run. Never had a blowout, only cap seperation. If not press. related, maybe temp? I still think I have a valid question for the tire mfg. which they won't/can't answer. If I knew the answer to my question, I could adjust driving speed to control temp. of tires or stop and let them cool. Now with smartire sys at least I know if I have a tire going down so alls not lost... ... ... ... ... Howard

 

[tlippy]

GrandPappy - you keep referring to "caps" What are they?

 

[Grandpappy]

tlippy... ... . The caps I'm refering to is the tread that is moulded to the tire... . the part of the tire that meets the ground. This is attached to the tire carcass using heat and pressure and is why too high temps can cause them to delaminate from the tire and the results ain't purty. Of course, bad design or mfg defects can also do this. Hope I answered your question, the above info I got from a Goodyear rep and is all I know about tire mfg.



Howard

 

[Eric_77]

Well the sensor for temp is not going to give you the right temps to be able to work with as temps we take at track and temp range provided by manufacturers are the carcass temps. The sensor is mounted on the wheel (giving air temp?). We run carcass temps of around 200-220 degrees for race tires that are designed for that temp range for max adhesion. The street tires, some people will show up with, will loose traction and self destruct at temps of 175-190 degees. Hope this helps without a pyrometer to measure the actual tire temp and how it relates to the numbers the sensor is giving, which could be higher, from brake heat, or lower, further from heat generation source this is all sort of just aguide by giving you tire temp (air temp).

 

[Grandpappy]

Eric... Thanks for the info. At least I have a guide line to start with. I think I will set my alarms at 150 degrees and see if these Goodyears can take it. I agree with you that air temp inside is most likely not same as true tire temp but maybe close enough for what I want. Thanks again..... BTW I had a '92 like yours, wish I still had it, best truck I ever owned. Hope this new one is as good... ... ... ..... Howard