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Open Roads Forum  >  Fifth-Wheels

 > Max Pressure Cold vs Hot Pressures - How Much Is Too Much

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Rollochrome

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Posted: 11/18/21 04:16am Link  |  Quote  |  Print  |  Notify Moderator

My Carlisle CSL 16's have a cold max pressure of 110.

I installed a TPMS the same day I bought them.

I read up on these tires and there was nothing about a hot max pressure from Carlisle. I contacted Carlisle and they said there was no "hot max" specified.

So on the maiden voyage with them, I watched the temps rise and rise above 110 to just under 120.

The tires on the sunny side were uniformly higher than the ones in the shade side understandably too.

I read elsewhere that a different manufacturer emphatically states on their website regarding trailer tires to NEVER bleed down HOT tires.

So it begs the question, how much hot pressure is too much? The TPMS system instructs to set alert levels that are pretty high.

What do you think is an acceptable pressure level hot relative to the cold max?

* This post was edited 11/18/21 09:53am by Rollochrome *


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Cummins12V98

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Posted: 11/18/21 10:22am Link  |  Quote  |  Print  |  Notify Moderator

You are well under temps that would be of concern.

Does your axle weights require the MAX of 110# ?


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Gooma

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Posted: 11/18/21 10:24am Link  |  Quote  |  Print  |  Notify Moderator

You are over thinking this.
Inflate the tires to the recommended cold pressure and forget about it. Check the pressure regularly when cold, cold being the ambient temp. 110 pounds at 30 degrees is not the same as 110 pounds at 90 degrees.

Rollochrome

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Posted: 11/18/21 10:28am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

You are well under temps that would be of concern.

Does your axle weights require the MAX of 110# ?


gawr 7,000 LB each axle

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time2roll

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Posted: 11/18/21 10:35am Link  |  Quote  |  Print  |  Notify Moderator

Max cold inflation is before you roll and before the sun hits the tire. This is good in all conditions. Once set correctly there is no reason for concern. If you have a drastic change in elevation or climate, feel free to reset the pressure again the next morning.


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Rollochrome

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Posted: 11/18/21 10:37am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Max cold inflation is before you roll and before the sun hits the tire. This is good in all conditions. Once set correctly there is no reason for concern. If you have a drastic change in elevation or climate, feel free to reset the pressure again the next morning.


Roger Wilco

thx

jkwilson

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Posted: 11/18/21 10:59am Link  |  Quote  |  Print  |  Notify Moderator

Most TPMS manufacturers recommend high pressure alerts at 125% of cold pressure. You are way under that.


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Rollochrome

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Posted: 11/18/21 11:02am Link  |  Quote  |  Print  |  Notify Moderator

jkwilson wrote:

Most TPMS manufacturers recommend high pressure alerts at 125% of cold pressure. You are way under that.


10-4

thx!

MFL

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Posted: 11/18/21 11:05am Link  |  Quote  |  Print  |  Notify Moderator

A tire only requires setting according to cold temperature, before towing, or setting in the sun. Yes, towing will add heat/pressure, no problem, if psi is set correctly.

The bigger problem would be way under inflated, from loss of psi, maybe causing tire to heat up/come apart, but then your TPMS should warn you first.

Jerry





way2roll

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Posted: 11/18/21 11:23am Link  |  Quote  |  Print  |  Notify Moderator

Curious why you are setting to max. Your FW should have a recommended psi .


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