Community Forums

sbleiweiss · 05-17-2025, 07:09 AM

My right inner duelly keeps heating up and getting too high pressure while driving. My TireMinder keeps alarming for it. Its cold setting is 95 pounds. It gets to 117. It is at 105 degrees when the other duelly is 95 degrees. What would cause this? Is it dangerous to drive this way? Tires are Michelin 735x80x22.5. Thanks.

wolfe10 · 05-17-2025, 07:18 AM

What "heat source" is on that side (like exhaust)?

Inners normally run warmer than outers, but if no apparent reason, it needs to be looked into.

For example, a dragging brake can cause higher temps.

Tony Ramirez · 05-17-2025, 07:32 AM

"For example, a dragging brake can cause higher temps."

That's what I'm thinking, possibly a brake issue? All my tire temps are usually close to each other, although the Sun side front & outer are warmer.

Argosy · 05-17-2025, 07:37 AM

I got a cheap laser thermometer at HF a few years ago for $20. I doubt if it's very accurate but it's good enough for something like hub and tire temps

If the tires aren't the same diameter the taller one will carry the weight. If for some reason the outer was replaced in the past and it's shorter that can cause problems.

Old Scout · 05-17-2025, 07:56 AM

Agree--duals should be of similar temp and PSI, exception being the inside duals [eg, air flow proximity to differential, exhaust pipe [gasser], etc. Depending on tire position, sunny side of rig, cross-winds, there can be some differences. Less likely, different tire diameters could be an issue. Generally, 15-20% increase in cold vs ops PSI is not unusual, tire temps are not critical until you get above 160-165 degrees. So, don't see your situation as being dangerous, but the differences in only one inside dual is curious.

Gary RVRoamer · 05-17-2025, 09:14 AM

Neither that 117 psi nor the 105 temperature is worrisome in & of itself, but the fact that one tire is markedly different than the others is worth investigating. It's common for an inner duel to be somewhat warmer (and thus higher psi) than the outer, but not usually that much. You should find out WHY the variance is large. It could be something simple like a nearby exhaust pipe heating it up, or something more serious like the dragging brake that others mentioned.

bentjm · 05-17-2025, 10:43 AM

You could also have a wonky sensor. Swap the two sensors and see what the readings are.

PS89 · 05-17-2025, 12:08 PM

Adjust the settings on the TPMS, yours are too tight.

As far as the temperature reported by the sensor, you're measuring at end of a long tube. That means you're measuring mostly the combination of the air temp around the sensor combined with any heat that has conducted up the valve stem. You're not measuring much of either the temperature of the tire or its interior air. The only real time that reported temperature is valuable is if it rises abnormally without an underlying decrease in pressure (means it's running under-inflated). This might indicate heat that is being generated from a hub or brake problem.

Quote:

Generally, 15-20% increase in cold vs ops PSI is not unusual, tire temps are not critical until you get above 160-165 degrees.

Pay attention to this and readjust the warning limits on your Tireminder, they are too narrow on the top end.

If you want an example of how a tire expert set up his TPMS, see this blog post by Roger Marble (Tireman9) - https://www.rvtiresafety.net/2017/08...m-my-tpms.html

Old Scout · 05-17-2025, 01:11 PM

OK--lets start over here. First--depending on ambient air temps, the higher PSI and temps are not a safety issue at this point. Second--I would like to see temp and PSI readings for all four dual tires, while at ops temp. At ops temp--all four tires should have elevated temps and PSIs vs cold temps. A manual PSI gauge reading vs TPMS would be desirable. Your post suggests the outside dual was still at 95 PSI, at ops temp? As mentioned, this could all be a "wonky" TPMS sensor[s] issue.

PS89 · 05-17-2025, 01:34 PM

Might help to also go watch this video.

https://www.youtube.com/watch?v=5Eu4D4eTu6A

ChrisDParise · 05-17-2025, 07:42 PM

Quote:

Originally Posted by PS89

Adjust the settings on the TPMS, yours are too tight.

As far as the temperature reported by the sensor, you're measuring at end of a long tube. That means you're measuring mostly the combination of the air temp around the sensor combined with any heat that has conducted up the valve stem. You're not measuring much of either the temperature of the tire or its interior air. The only real time that reported temperature is valuable is if it rises abnormally without an underlying decrease in pressure (means it's running under-inflated). This might indicate heat that is being generated from a hub or brake problem.

Pay attention to this and readjust the warning limits on your Tireminder, they are too narrow on the top end.

If you want an example of how a tire expert set up his TPMS, see this blog post by Roger Marble (Tireman9) - https://www.rvtiresafety.net/2017/08...m-my-tpms.html

Good answer

I have the Tireminder i10 TPMS on all 6 tires plus my toad

First season got warnings about high pressures. My baselines were set to the actual set pressures. Called Tireminder for help. They advised setting all the baselines to actual plus 8%. That solved the warnings

My inner dually near the exhaust is always hotter than the outer.

In my 5th season with Tireminder. Works like it should

sbleiweiss · 05-18-2025, 08:08 AM

Thanks everyone. OP here.

This tire that is higher on temp and pressure is on the opposite side from the exhaust pipe. And it didn't use to be different, so I don't think it would be due to a design issue like that.

All tires are the same size. No, I didn't mean that the OUTSIDE dually was still 95 degrees at op temp. I meant the other INSIDE dually was.

Glad to hear that it is not dangerous at these numbers. I sort of guessed that, since my fronts are run much higher (105 cold), so they normally get much higher while driving without reaching the 20% alarm. I am now about 800 miles from home so will leave this until I get back.

How do I check to see if a brake is dragging?

Odd that TireMinder sets its alarms at 20% if normal rise is close to that amount. My understanding from talking to TireMinder is that the 20% can't be changed. The only work around would be to lie about what the tires are actually set to, as one of you suggested.

I will read the post and watch the video that you suggested. Thanks again.

MN_Traveler · 05-18-2025, 08:35 AM

To op: agreed that tireminder is overly tight on their high pressure alarm. I fight it constantly, and have to reset my baseline to avoid it. That said, it is often mentioned here (and I fully agree) that the TPMs is best used to detect *differences*, not absolutes. If you have history with this system, and this is a new behavior, then this is a warning to get that tire/brake checked to see what is different. If the TPMs is new to you and you are just seeing this for the first time, then …. This is a warning to have the tire/brake checked to see if anything is wrong (and do check both -there could be something amiss with the bands in the tires)

ChrisDParise · 05-18-2025, 09:14 AM

Quote:

Originally Posted by sbleiweiss

Thanks everyone. OP here.

This tire that is higher on temp and pressure is on the opposite side from the exhaust pipe. And it didn't use to be different, so I don't think it would be due to a design issue like that.

All tires are the same size. No, I didn't mean that the OUTSIDE dually was still 95 degrees at op temp. I meant the other INSIDE dually was.

Glad to hear that it is not dangerous at these numbers. I sort of guessed that, since my fronts are run much higher (105 cold), so they normally get much higher while driving without reaching the 20% alarm. I am now about 800 miles from home so will leave this until I get back.

How do I check to see if a brake is dragging?

Odd that TireMinder sets its alarms at 20% if normal rise is close to that amount. My understanding from talking to TireMinder is that the 20% can't be changed. The only work around would be to lie about what the tires are actually set to, as one of you suggested.

I will read the post and watch the video that you suggested. Thanks again.

Tireminder i10 individual tire baselines can be edited otherwise they're set to the actual tire pressure when the cap is installed on the tire. The i10 owners manual says to set the baselines but there's no guidance on what they should be so it's up to the owner to adjust them

To avoid false high pressure alerts I was advised by Tireminder to raise the baselines and the advice they gave me was for my 80 psi duallys but i raised all 6 tires the same percent, i think by 8%. Didn't like getting a false alert when there wasn't an issue.