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Old 05-11-2021, 11:10 AM   #1
Jkd
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Tire pressure

I have a 2008 Flagstaff Micro Lite, 18 ft. Dry weight 3,000 lbs. I can’t read recommended tire pressure on label. Tires max pressure 65 lbs. ideas on what pressure I should be running? Thanks
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Old 05-11-2021, 11:40 AM   #2
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I always ran my tires at max sidewall pressure even when pulling a pop-up. Never had an issue.

Since some on this site will flame me for saying that..

The tire manufacturers have charts on their website that can be used to determine proper PSI. Check what brand, model, and size you have there and go to the site.
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Old 05-11-2021, 11:40 AM   #3
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Tire pressure should be max (65 PSI) unless you have a known weight to use in the ST tire pressure/weight charts for your tire size and load range D. Dry weight is pretty meaningless at this point. If still on the original tires, you are living on borrowed time.

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Old 05-11-2021, 11:44 AM   #4
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Look at the sidewall of your trailer tires. I'll bet on there it says "Inflate to:". Notice that it probably does not say "Maximum inflation". If it says "Inflate to:" then I would follow those instructions. Should be 65 psi for load range D.
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Old 05-11-2021, 11:55 AM   #5
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Quote:
Originally Posted by NavyLCDR View Post
Look at the sidewall of your trailer tires. I'll bet on there it says "Inflate to:". Notice that it probably does not say "Maximum inflation". If it says "Inflate to:" then I would follow those instructions. Should be 65 psi for load range D.
Hummmm... never seen "inflate to"....



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Old 05-11-2021, 12:18 PM   #6
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So mine actually say "MAINTAIN 65 PSI INFLATION PRESSRE". So that's what I do.
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Old 05-11-2021, 12:40 PM   #7
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I’ll take a closer look. Thanks
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Old 05-11-2021, 12:41 PM   #8
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Thanks
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Old 05-11-2021, 01:21 PM   #9
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Also, remember ‘cold’. Adjust your tire pressure in cold temps.
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Old 05-11-2021, 01:39 PM   #10
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Correct trailer tire pressure is the same as maximum cold tire pressure. Automobile tires are designed to run at pressures below that for ride comfort -- no one is riding in the trailer.

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Old 05-11-2021, 02:29 PM   #11
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Originally Posted by ARhappycamper View Post
Also, remember ‘cold’. Adjust your tire pressure in cold temps.
What if 80 degrees is cold?
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Old 05-11-2021, 02:59 PM   #12
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Originally Posted by Chuck_S View Post
Correct trailer tire pressure is the same as maximum cold tire pressure. Automobile tires are designed to run at pressures below that for ride comfort -- no one is riding in the trailer.

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Then why do tire manufacturers such as Goodyear, for their ST Endurance trailer tires, publish a load/inflation chart?

Goodyear Tires RV Inflation Chart
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Old 05-11-2021, 03:19 PM   #13
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Anyone besides Goodyear? Deflating ST tires has no value. Will a large ST tire support certain weights at reduced pressure? Sure. But so what? Blow a trailer tire (almost always the result of overweight and/or under pressure) and you'll discard the idea of running anything less than maximum cold sidewall pressure. Running max pressure gives a cushion as well. There are no downsides to this. Check tire pressure in the morning. If it's 80° it's 80°.

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Old 05-11-2021, 03:54 PM   #14
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What if 80 degrees is cold?
when they specify cold, they mean before driving on them, aka warming them up.
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Old 05-12-2021, 12:09 AM   #15
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Passengers or not, the trailer tires heat up and gain pressure the same as vehicle tires.
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Old 05-13-2021, 03:05 PM   #16
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Quote:
Originally Posted by NavyLCDR View Post
Look at the sidewall of your trailer tires. I'll bet on there it says "Inflate to:". Notice that it probably does not say "Maximum inflation". If it says "Inflate to:" then I would follow those instructions. Should be 65 psi for load range D.
That is usually what it says on wheelbarrow tires. Highway tires will give a load at maximum pressure.

Since trailer manufacturers ship with a tire that just meets the design load of the trailer the max pressure is OK. If one goes up in load range running at the new max pressure often the result is a harsh ride for everything in the trailer. Plus loose screws and even bottoms of drawers falling out.

That's why load/inflation charts are published, especially for "up-rating" tires from OEM.
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