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 > Question about tires..smell? Temp?

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cbigham

orange , CA

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Posted: 10/03/21 11:45am Link  |  Quote  |  Print  |  Notify Moderator

[image]

Hi all,
Have a question about tires..Tires are hot at 80, 82 psi returning from cold mountain trip thru local desert, traffic and home. Rear tires noticably hotter than fronts and had a smell like hot rubber.
Posted are the weights on the axels for my 23u thor. I notice I'm about 700lbs below the limit of the rear axle. Usually that axle is loaded about 600 lbs lighter. No smell, not so hot.

Is there a danger? Factory michelin tires, 2016 date. Don't recall smelling this. Tires not painful hot but hot. Touched the rims, axle shafts..not the source of heat. It's tire flex. This is the most I've loaded this. E450 chassis, 2017 model 14,000 gvwr. Usually carry a 300 lbs motorcycle on back never a worry. This time a 470 lbs bike and about another 50lbs lbs for the more stout rack tying into frame.

Any thoughts?


Thanks

Cb

* This post was edited 10/03/21 12:48pm by cbigham *

PartyOf Five

Wheaton, IL

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Posted: 10/03/21 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

Our 31' has a lot of extra weight on that rear axle regularly so we go overweight regularly so we need to keep them at the max 80 psi. Never noticed a smell but we watch the speed on hot pavement, sometimes even deliberately choosing to drive early/ late.


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DrewE

Vermont

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Posted: 10/03/21 01:54pm Link  |  Quote  |  Print  |  Notify Moderator

I wouldn't be worried. If one tire were noticeably hotter than the others it would be good to give that one some scrutiny as it may be low or delaminating internally or something; but tires generally getting quite warm in use is normal. (I'm assuming the cold inflation pressures are correct for the weight they're carrying; pressures when they're hot will of course be higher per the ideal gas law.)

I highly suspect the smell comes from something other than the tires.





CA Traveler

The Western States

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Posted: 10/03/21 01:55pm Link  |  Quote  |  Print  |  Notify Moderator

Congradulations you have the first step to setting the correct tire pressure. Go the the tire mfg load inflation table for your tires and set the tire psi per axle per given weight when cold as indicated. Weight is based on fully loaded, full fuel, water and propane.

Example: My steers are set to 120psi and duals to 90 psi based on axle weight and 2 vs 4 tires on the axle, same tires.

Max psi is used when you don't know the weight or think you know more than the tire mfg.

I've seen 140F internal tire temps, just keep on trucking.


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
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Bob


cbigham

orange , CA

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Posted: 10/03/21 02:08pm Link  |  Quote  |  Print  |  Notify Moderator

I've already done the math. I set off at 76 lbs, came in at 82, 83 lbs??

* This post was edited 10/03/21 06:15pm by cbigham *

Desert Captain

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Posted: 10/03/21 02:28pm Link  |  Quote  |  Print  |  Notify Moderator

"Weight is based on fully loaded, full fuel, water and propane."

Not sure what you mean... Weight is weight regardless of how you get there. Our E-350 with a GVWR of 11,500# can be anywhere from 10,000 to 11,500 depending on how I am loaded and/or towing. Weigh the coach loaded as you normally travel and then set your psi based upon the tire manufacturers load/inflation table. The weights shown on your door jamb are rarely accurate in the real world.

Depending on your tires load rating {D, E, F whatever} your tires may be quite capable of handling their actual loads and still be well under the max psi found on the sidewalls. Max Psi and door jamb numbers might maybe be accurate occasionally but never assume them to be correct without knowing the load each tire is actually carrying.

Just sayin...

[emoticon]





CA Traveler

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Posted: 10/03/21 02:36pm Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:

I wouldn't be worried. If one tire were noticeably hotter than the others it would be good to give that one some scrutiny as it may be low or delaminating internally or something; but tires generally getting quite warm in use is normal. (I'm assuming the cold inflation pressures are correct for the weight they're carrying; pressures when they're hot will of course be higher per the ideal gas law.)

I highly suspect the smell comes from something other than the tires.
X2

Tire temp and hence psi is also dependent on road condition and the sun can be a significant factor.

CA Traveler

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Posted: 10/03/21 02:47pm Link  |  Quote  |  Print  |  Notify Moderator

Desert Captain wrote:

"Weight is based on fully loaded, full fuel, water and propane."

Not sure what you mean... Weight is weight regardless of how you get there. Our E-350 with a GVWR of 11,500# can be anywhere from 10,000 to 11,500 depending on how I am loaded and/or towing. Weigh the coach loaded as you normally travel and then set your psi based upon the tire manufacturers load/inflation table. The weights shown on your door jamb are rarely accurate in the real world.

Depending on your tires load rating {D, E, F whatever} your tires may be quite capable of handling their actual loads and still be well under the max psi found on the sidewalls. Max Psi and door jamb numbers might maybe be accurate occasionally but never assume them to be correct without knowing the load each tire is actually carrying.

Just sayin...

[emoticon]
OK, agree Just sayin... - tryin to say that is. RV fully loaded, full water, fuel, propane (and passengers) and use that axle weight for the load inflation tables.

If you know your actual weight for a given trip and choose to adjust your tire psi for that trip then ...

rjstractor

Maple Valley, WA

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Posted: 10/03/21 05:41pm Link  |  Quote  |  Print  |  Notify Moderator

cbigham wrote:

I've already done the math. I set off at 86 lbs, came in at 82, 83 lbs??


Meaning your cold tire pressure was 86? When I had a C I ran rear tires at 80 psi cold, and they would routinely read 95 psi when hot, which is normal.

On these rigs in particular there are factors at play that contribute to hot tires and premature failure (learned this the hard way). When fully loaded, the tires are very close to their maximum load ratings. Also, the wheelwells are quite small, so there is not much airflow to help cool the tires. Another thing that I experienced was two tread separations on the passenger side inside dual, which was quite close to the exhaust. I think that the extra exhaust heat may have contributed to the tire failure.

CA Traveler

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Posted: 10/03/21 06:07pm Link  |  Quote  |  Print  |  Notify Moderator

cbigham wrote:

I've already done the math. I set off at 86 lbs, came in at 82, 83 lbs??
What math? All things being equal psi goes down with elevation. All things being equal psi goes up with tempeature.

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