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Old 03-15-2023, 03:39 PM   #1
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Cold Pressure on Tires vs. "normal pressure."

Getting ready to take out Escape 19 trailer for the first 3 days trip of 2023.

I was looking at tire pressure. On the side of trailer sticker states 50 psi cold pressure. The tires now are about 34 psi pressure. Do I need to be concerned regard the "cold pressure" psi?

Any thoughts would be great

Thanks Dale
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Old 03-15-2023, 03:51 PM   #2
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IMHO, 34 PSI is far too low. yes, inflate to 50 PSI... if after traveling somewhere, you find yourself in considerably warmer weather, check the tires in the morning and adjust to 50PSI.

actually, you should check them about once a week before driving.
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Old 03-15-2023, 04:07 PM   #3
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Quote:
Originally Posted by John in Santa Cruz View Post
IMHO, 34 PSI is far too low. yes, inflate to 50 PSI... if after traveling somewhere, you find yourself in considerably warmer weather, check the tires in the morning and adjust to 50PSI.

actually, you should check them about once a week before driving.
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Old 03-15-2023, 04:33 PM   #4
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The 50PSI is at 70 degress . 34 seems low but who knows how cold it is where you're at. If it was me I take them to 45 and I am sure they be 50psi or above once you get some road heat.
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Old 03-15-2023, 07:10 PM   #5
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Originally Posted by NEWYORKHILLBILLY View Post
The 50PSI is at 70 degress . 34 seems low but who knows how cold it is where you're at. If it was me I take them to 45 and I am sure they be 50psi or above once you get some road heat.
I've always heard its for ambient temps... if your tires go up 30 degrees when driving, and its 32F(freezing) outside, they will be 62, while if its 70F ambient, they will be 100F. either way you want the same pressure in them.

fyi, the pressure goes up about 1 PSI per 10F degrees. tire pressure is always speced 'cold' meaning outdoor ambient temp.

the typical ST205/75R15 has a maximum inflation pressure around 65-75 PSI, so you're not going to blow a tire by putting 50PSI in it when its freezing, then driving in warm to hot weather. 50 to 65 PSI would be a 150 degree temp increase, that's just not happening.
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Old 03-15-2023, 09:52 PM   #6
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Tire pressure discussions come up a couple times a year. Depending upon the loads on the tire, road speed and road surface, temperature rise during the day and other factors I’ve come to believe that doing a little experimenting with the pressures, adjusting for ambient air temperatures, checking the pressure each morning, making an attempt to balance the side to side load in the trailer, will allow you to find your sweet spot. When we’re on the road in the heat of the summer, I start the day at about 56 psi. coming off the road in the mid afternoon, the tires are often in the low 60’s. So I don’t regularly check pressure late in the day with the intention of adjustment. I just make sure they are all even in the morning and go from there. Same on the tow vehicle pressures that I like. I have a portable inflator, a good tire pressure tester and a spot thermometer that I use to check the hubs and brakes temps. Buy a tread depth gauge and use that to pick up on subtle uneven wear that shouldn’t be there. Tire brands vary in composition
wear, tread design and other factors so you can’t always go by what works for others.
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Old 03-15-2023, 10:02 PM   #7
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to be fair, 50PSI on the ST205/75R15 is actually a fair bit /more/ than a dual axle trailer maxing at 4500 lbs (E21, E19) needs.

figure 450 lbs tongue weight, thats 4050 lbs divided by 4 tires is 1012.5 per tire.
per the table here, https://www.yournexttire.com/trailer...flation-chart/ a ST205/75R15 at 50PSI cold is rated for 1820 lbs.

and yes, it really is about the tire size and pressure and load, the tire brand and model and construction details don't matter at all. only difference between a load range B or C or D tire is the maximum rated cold pressure, where a B tire is maximum 35 PSI, a LR C tire is max 50 PSI, and a LR D tire is max 65 PSI.

all these numbers allow for normal pressure increase under operating temperatures.
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Old 03-24-2023, 02:48 PM   #8
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The "cold" description is not about ambient temperature. Tires heat up while driving, and it just means the pressure before driving.

Quote:
Originally Posted by John in Santa Cruz View Post
to be fair, 50PSI on the ST205/75R15 is actually a fair bit /more/ than a dual axle trailer maxing at 4500 lbs (E21, E19) needs.

figure 450 lbs tongue weight, thats 4050 lbs divided by 4 tires is 1012.5 per tire.
per the table here, https://www.yournexttire.com/trailer...flation-chart/ a ST205/75R15 at 50PSI cold is rated for 1820 lbs.

And the same table shows that the load capacity of these tires is 1480 pounds per tire at 35 PSI, so at the current 34 PSI is about 1437 pounds, or 5748 pounds for all four (if the trailer is level and evenly loaded left to right)... so that's enough for an Escape 19'. ETI's recommendation of 50 PSI is probably a reasonable inflation pressure, and something more than 34 PSI is probably advisable to leave a margin for error and uneven loading, but even 34 PSI is enough.
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Old 05-13-2023, 05:42 PM   #9
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My tire says inflate to 50 psi (cold) on them. Carlisle ST205/75 R15.
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Old 05-13-2023, 11:38 PM   #10
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https://www.yournexttire.com/trailer...flation-chart/
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Old 05-14-2023, 10:50 AM   #11
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Originally Posted by John in Santa Cruz View Post
IMHO, 34 PSI is far too low. yes, inflate to 50 PSI... if after traveling somewhere, you find yourself in considerably warmer weather, check the tires in the morning and adjust to 50PSI.

actually, you should check them about once a week before driving.
25 is far too low
34 is slightly low depending on the tire load rating. I always check the load tables on my tires. Overinflated tires will bounce your trailer around excessively. My new trailer lists 35 psi for the tire pressure as the minimum. I’m running at 50.
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Old 05-14-2023, 01:05 PM   #12
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When I’m running very good highway that I know is good because I drive it frequently, and I’m loaded heavy over the axles I’ll run 56 cold on spring and fall runs. Otherwise I run 50-52 cold. On the Highlander I run 41.5 rears 40 fronts on Michelin Defenders. I’m using Goodyear Endurance tires on the trailer and I drive between 58 and 62 miles an hour. Once in a while a little faster like 3 miles an hour faster. In open country and flat roads
(1-90) in South Dakota etc.
I used to drive faster but I’ve backed off and upped my concentration of the task at hand as I’ve aged. Cause I don’t want to “age out”
When I go, I want it to be quietly in my sleep like grandpa, not crying and screaming like the passengers in his car.
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Old 05-14-2023, 01:35 PM   #13
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Max tire air pressure

I've had more than one friend tell me : my car tires say to inflate to XX.

This uninformed answer can be dangerous on car tires.

My GMC came with General tires that say : "Max Press 44". The manual says to run 35, and that's what I do.

My 4Runner has Michelins that say: "Max Press 44"". The manual says to run 32 and that's what I do.

My Audi's have Michelins that say : "Max Press 50". The manual says to run between 32 and 44 depending on loading/people. Also different for front and rear.

My Corvette has Michelins that say : "Max Press 51". The manual says to run 30 and I run 32.

My Escape came with Carlisles, but I now have Goodyear Endurance tires that say:
"For Max Load Inflate to 65". I run about 59 or 60.

I have yet to find a tire that says : "Inflate to XX". Maybe Carlisle does for trailer tires.

The higher a tire is inflated, above manufacturer recommendation, the more likely it will lose traction in wet, it will lose traction in turns, and most importantly it will lose traction for braking. The highest possible number is not necessarily the best.
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Old 05-14-2023, 02:27 PM   #14
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Quote:
Originally Posted by Bill and Earline View Post
...

My Escape came with Carlisles, but I now have Goodyear Endurance tires that say:
"For Max Load Inflate to 65". I run about 59 or 60.
...
Same here, running Endurance tires on the '21 now.

"Max Load" is far above the weight that a single tire has to carry - when its next door tire has a flat.
I run with 46psi cold, seems to be a good compromise for the excessive bouncing that I got at 60psi.

I also add 4psi over the door label recommendation on the truck when pulling the trailer. I found it keeps the tires cooler - and heat is also an enemy of tires. When I stop for gas all tires get the hands-on heat evaluation.

But no one recommended this - just from experimentation.
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Old 05-14-2023, 02:30 PM   #15
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The tires on my Z-Turn mower are labeled as an “inflate to”. This is critical as to even tracking for each drive wheel. I just bought an old style pencil type tire tester for my daughter. It was a Milton. They are made in USA. It cost $13. The Chinese one was $7.
I have an Acme here at home that Rita’s uncle had when he was over the road for CRST.
In the cars I have Schraders.
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Old 05-14-2023, 02:46 PM   #16
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John Deere 10 psi

We’ll, I didn’t want to contradict my earlier observations, but yes, the lawn tractor has.mud grip Carlisle’s that says to: “Inflate to 10 psi max”
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Old 05-14-2023, 03:46 PM   #17
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I always make sure i’m 50 psi cold before heading out, usually after I’m on my way and down the road a couple hours the most I see it rise is to about 53-54 psi on my TST monitor.
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