Good Sam Club Open Roads Forum: Tech Issues: TT Tire Pressure
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philh

Belleville MI

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Posted: 12/23/19 07:46pm Link  |  Quote  |  Print  |  Notify Moderator

Things were much easier before the TST monitor [emoticon] Tires were up to pressure, and then they weren't!

Tire have max pressure of 60 PSI. They were at 57 when I left MI, while driving to FL got up to a max of 69. Is this acceptable while driving? Temps were just a few degrees above ambient.

One interesting point, right side tires run a touch hotter 2F over left side.

ScottG

Bothell Wa.

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Posted: 12/23/19 08:03pm Link  |  Quote  |  Print  |  Notify Moderator

Yes, that's fine and if the sun is shining on one side I've had it be 10 degrees hotter or more.


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Optimistic Paranoid

East Nowhere NY

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Posted: 12/24/19 03:37am Link  |  Quote  |  Print  |  Notify Moderator

The max pressure is COLD pressure. The tire engineers know it's going to go up when the tire heats up, and they allow for that.

Terryallan

Foothills NC

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Posted: 12/24/19 06:21am Link  |  Quote  |  Print  |  Notify Moderator

Optimistic Paranoid wrote:

The max pressure is COLD pressure. The tire engineers know it's going to go up when the tire heats up, and they allow for that.


And there is the right answer. Tire PSI goes up as the tires heat up. It is what they are designed to do.


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MFL

Midwest

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Posted: 12/24/19 06:46am Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

Things were much easier before the TST monitor [emoticon] Tires were up to pressure, and then they weren't!

Tire have max pressure of 60 PSI. They were at 57 when I left MI, while driving to FL got up to a max of 69. Is this acceptable while driving? Temps were just a few degrees above ambient.

One interesting point, right side tires run a touch hotter 2F over left side.


You say tire max is 60 psi, and 57 when you left. Normal TT tires would be 50/65/80 max pressure, or more, depending size/plies. If yours are supposed to be 65, running them at 57 will cause more heat. Towing at normal speed, a gain of 10 psi is normal. The sun side does run slightly warmer, normal also.

Jerry





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North jersey

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Posted: 12/24/19 07:01am Link  |  Quote  |  Print  |  Notify Moderator

I’ve gained as much as 16 psi on a highway trip on a sunny day, when close to max weight. No issues, and still on those tires now 3 years later


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philh

Belleville MI

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Posted: 12/24/19 07:35am Link  |  Quote  |  Print  |  Notify Moderator

MFL wrote:


You say tire max is 60 psi, and 57 when you left. Normal TT tires would be 50/65/80 max pressure, or more, depending size/plies. If yours are supposed to be 65, running them at 57 will cause more heat. Towing at normal speed, a gain of 10 psi is normal. The sun side does run slightly warmer, normal also.

Jerry

I'll look again, but it may have been the wheels that set max pressure at 60. Looks like the tires are 65max

MFL

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Posted: 12/24/19 08:27am Link  |  Quote  |  Print  |  Notify Moderator

Don't see your trailer on your profile page. If these are original tires/wheels, I'd certainly run them at max pressure. I know some people way over tire their trailers, then reduce pressure. IMO, not the best option, but opinions vary, especially with the huge number of tire experts on any RV forum! [emoticon]

Jerry

2oldman

Ca

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Posted: 12/24/19 10:26am Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

One interesting point, right side tires run a touch hotter 2F over left side.
In the sun they may read much hotter than that.

I'm as much concerned with temperature as I am pressure. If any wheel gets significantly hotter than the other, it's time to pull over.

Lwiddis

Monterey, CA

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Posted: 12/24/19 11:07am Link  |  Quote  |  Print  |  Notify Moderator

Filling to max cold pressure gives the max weight rating per my tire's manufacturer.


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