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Old 02-13-2016, 09:44 PM   #1
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Proper tire pressure

Salem Cruise Light 2015 Ridgeway Sport ST205/75D14 tires

All I can find is "maximum pressure" not what is proper or normal psi. 50psi max BTW?

Anybody know?
Not on tires, not in manual & not on any placard trailer, door or inside that I can find.

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Old 02-13-2016, 10:22 PM   #2
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HI, you should have a yellow and white sticker on your RV that say's "Tire and Loading Information". It should have the tire size and the recommended cold tire pressure listed on it.

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Old 02-13-2016, 10:33 PM   #3
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IMO-Most, if not all, trailers should run with whatever the max pressure is as they are usually at the upper end of the load range.
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Old 02-13-2016, 10:37 PM   #4
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Question Proper Tire Pressure

It does. It lists cold tire pressure as, "50psi" the same that is listed on the tires & manual as max pressure.
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Old 02-13-2016, 10:42 PM   #5
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That means the design maximum cold inflation pressures for the rv and the tires are the same
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Old 02-14-2016, 07:01 AM   #6
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MANY THANKS TO ALL. I appreciate your input.
I suspected this but wanted confirmation from ppl more in the know. Seems a convoluted way instead of just saying it as Tommy Joann did, but there it is.

Just to summarize for anyone else. When the MAXIMUM operating pressure and the COLD operating pressure are the same, the tires are to be operated NORMALLY at maximum psi. Usually the load is at or near maximum for trailers. Yes?

In my mind cutting it close for potential, tire failure insurance denial/claims and worse things to follow.
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Old 02-14-2016, 09:08 AM   #7
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Go look at every trailer or fifth wheel on every RV sales lot in the country and you will find the same. It is not just your trailer. It's always max pressure. You would have to do some calculations to determine how close to max load you are. Some are and some are not.

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Old 02-14-2016, 01:28 PM   #8
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In the manufacturing world, this, IMO, is how it works. The regulations for RV trailer tire fitments allow the fitment of tires to an axle to provide a load capacity equal to the axles GAWR. The trailer manufacturer is allowed to set the GAWR. The GVWR is the maximum weight the trailer is designed to weigh. It is presented that way in your owner’s manual. The published pin weight when added to the total GAWR must equal or exceed the trailer’s GVWR.

If a trailer manufacturer provides a trailer so equipped, the minimum safety regulations have been met. The trailer manufacturer’s duty is done. Once a consumer takes possession of the trailer it’s their duty to insure it’s operated safely. That includes not exceeding any of the GAWR weights or the GVWR. If you do not follow the trailer manufacturer’s tire inflation recommendations for your OE tires you’re out on the limb all by yourself. Believe it or not, trailer over weight conditions and tire under inflations are the number one causes for early tire failures, often catastrophic failures.

Sure, we see a lot of complaints about trailer tire failures but seldom is their an accompanying explanation of the cause. “China Bomb” causes can’t continue to be a just cause without triggering a tire recall action by NHTSA.
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Old 02-14-2016, 01:57 PM   #9
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Googled the tires and ST 205/75 D14 bare 1760 lbs AT 50 psi.
Exeption to the rule nowadays is that they are Diagonal tires.
These need na different calculation of the pressure wich lead to higher loadcapacity in the lower pressures.

But because of the story Airdale gave, you probably have loads on some of the tires that are close to or even over maximum load on tire.
So 50 psi is needed or even higher.
And this higher is allowed by the tiremakers up to 10 psi.
And probably it is wiser to fill the tires to this 60 psi , to cover overloading.
An ST tire , probably also in Diagonal tire , is calculated in maximum load for maximum speed of 65 m/h so more deflection allowed.
Wiser would be to give the tire a deflection that belongs to a speed of 99m/h ( Q speedrated) for lesser heatproduction, and still no bumping.

to make this already to long story short, try to give the needed data as accurate as possible, and I will calculate a needed pressure with as much possible reserve but still no bumping.

This is probably higher then 50 psi , mayby even over 60 psi , then use 60 to be in the clear for the tire makers allowance.
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Old 02-14-2016, 02:29 PM   #10
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Proper tire pressure

Are you sure it is 10 psi over the max or is it the vehicle manufacture says inflate to 40 the max is 55 so you can go up the 10 psi without going over the sidewall max.


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