TPMS Alert: Tire Pressure Too High?

After doing some research at the fount of all knowledge, I realize I should not lower the pressure in my tires as they heat up. Upon reflection, I should have known this anyway. Oh, well, the tires never rolled with less than 50 psi in them.

What was your loadcapacity of your Michelin 225/75R16 E-load tires ?
If you give that information , I can compare it wiht data I have from European Michelin.
Incidentially the inside tire temp can rise even up to 212degrF/100degrC, so I was informed by a valve importer here in Holland ( Europe).
And then mostly by the heat of brakes transported trough the rimms.
The tires are tested , so I read once ( in some topic by Capriracer and or Tireman9) to can stand an absolute overpressure of 2 to 3 times AT-pressure ( yours 80 psi and is not the maximum cold pressure of tire)
So if tire is constructed for E-load and put in the market for E-load it even can stand a pressure of about 160 to 240 psi before it blows up.
More to the borders it get when a D-load tire construction is put in the market as E-load , then it will blow at 2x65=130psi to 3x65= 195 psi.


But if pressure rises to much , never let out air, is also an advice of the tire-makers.

So here the TMPS , wich is meanth for extra savety , cources that you bleed of air when in fact you should probably even put more air in it.
And by this the use gets unsaver instead of saver, wich is probably not the goal of it.

My tires are 80 psi cold. I have seen 95 psi after running 50 miles.

I was able to touch the tire without burning my fingers.

Next time stop and measure the tire temperature. If you can touch the tire without discomfort then everything should be OK.

The temperatures that most TPMS system report are no where near actual tire temperature. My TST seams to report about 10 degrees above ambient regardless what the tire pressure is.

But as said do not let air out of the tire.

GMW, good advice and will try that on the next trip. These are E rated so will air to the max of 80 psi.

Tires are brand new, just bought them before Easter, they are Commodore LT's from Big-O Tire. If I did my research correctly, these are the least expensive set of LT225/75-16E tires on the market! I normally don't don't shop for tires on price, but wasn't planning to replace them until next year.

Those aren't the Michelin M/S LT 225/75R16 that were recalled are they?

Executive wrote:
Do your tires have MAX PSI stamped on them? If so, if the tires do not exceed that pressure, you're ok. If they do, then that's a problem.

Temps are another issue altogether. Too hot indicates an issue, (bearing, caliper hang up etc). Taking no action on a heated wheel can cause fire...not a pleasant outcome...Dennis

nope, nope, nope. the max pressure on the sidewall is for the max COLD pressure, measured when the tire hasn't been run for several hours. Hot tire pressure can go WAY above that without an issue. It's only the cold inflation pressure you need to be concerned with.

Now, if you have a dragging brake, wheel bearings going, they may heat up the rim and cause some additional heating in the tire, but most of the temp increase is due to friction in the tire carcas as it flexes as it rotates.

The proof would be in trying it. Perhaps he will try it, and report back what the pressure increase is after starting out with 80psi cold.

Running tires results in some flex causing an increase in temperature. Sun will also increase the temp. Although more flex will result in some more heat, I think it's almost impossible for *low* pressure to cause so much heat that it turns into high pressure.

My rear truck tires are 80psi cold, trailer 95psi cold. I've set my TPMS alarms 20psi above that. If it hits that I should look to see if I have a brake dragging or a bearing hot. As long as it's normal pressure increase due to driving and sun I'm not concerned. Tire manufacturers say set them cold and then run for the day.

Last winter we left MN at around 10deg and drove to TX, one day the ambient temp rise was about 40-50degs. TPMS didn't alarm, I did let a couple pounds air out before starting out the next day though since we'd be in warmer temps for a month.

Too low pressure is THE reason for TPMS. The temp indicator is a nice to have which *may* help catch a dragging brake or bad bearing, NOT looking for normal tire temp rise.

BurbMan wrote:
Loaded up last week in Louisville, ambient temps in the 70's and headed for FL. The LT225/75-16E tires on the TT set to 75 psi.

Down I-65 through AL with ambient temps in the 90's...pavement so hot I couldn't go barefoot.

Exit I-65 and down US 31 headed for the FL panhandle and the trailer TPMS alarm goes off...for high pressure in the RR trailer tire at 89 psi. RF was reading 87 and both left side tires were at 85. I stopped and bled off a few psi from both right side tires and also checked the rears on the truck.....80 psi cold was now a whopping 97 psi!! I brought them down to 90. I don't have TPMS on the truck tires.

Trailer tire temps were running in the 125*F range, not especially hot.

Anyone else ever experience this? Traveling from a cool area to a warm area with climbing tire pressures? I bought the TPMS to warn me of low pressures that could lead to a blowout, but never expected a high pressure alarm.

Don,
To large pressure change from cold to hot running could indicate the tire is getting too hot as a result of too low initial ( cold ) starting pressure. In your case I would start out with 80psi cold and see what you get then. The hope would the higher cold psi would result in less flex, therefore less buildup of pressure.

Do your tires have MAX PSI stamped on them? If so, if the tires do not exceed that pressure, you're ok. If they do, then that's a problem.

Temps are another issue altogether. Too hot indicates an issue, (bearing, caliper hang up etc). Taking no action on a heated wheel can cause fire...not a pleasant outcome...Dennis