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Old 05-22-2012, 09:19 AM   #1
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Tire inflation.

Now I'm confused, which isn't hard to do these days. I saw on another post criticizing a PDI tech for letting air out of tires to bring them down to the 50 psi listed on the trailer instead of the 65 as listed on the tire. I have always kept my vehicle tires inflated to the manufacturers recommendation as listed on their stickers instead of the max listed on the tires. Which should it be for the TT? I've been keeping them at 50 as the sticker says. Should they be inflated to the max as listed on the tire sidewall instead?

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Old 05-22-2012, 09:50 AM   #2
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I believe the issue there was that the sticker was for load range 'C' tires while the camper actually had load range 'D' tires. The tech wasn't smart enough to catch that the sticker was wrong.
Remember that the maximum presssure rating on the tire is for maximum load. I run load range D's, but only have 60 psi in them as my load is no where near the maximum. However, I wouldn't run them too soft either. Say of the load was 75% of the maximum, I wouldn't run the tires at 75%, or 49 psi. The extra pressure also decreases rolling resistance, thus slightly better fuel milage, plus the tires probably run cooler.

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Old 05-22-2012, 07:47 PM   #3
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Good points but don't forget that the tire isn't the only thing in the equation. There are load range C and load range D wheels also. Load range C wheels are only specified to hold 60 pounds of air. When I needed new tires, I had lots of discussions with the tire dealer, my trailer dealer, and a Forest River. We all decided that load range D tires on my C wheels would be fine at 60psi and give me a little more headroom as far as weight and endurance. This is below the max sidewall pressure on the tires, but is max for the wheels, where the max sidewall pressure for the load range C tires was 50psi.
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Old 06-22-2012, 06:24 AM   #4
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Good general info on tire care and inflation.
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Old 06-22-2012, 06:48 AM   #5
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here is an interesting tire and load chart from Goodyear.

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Old 06-22-2012, 08:13 AM   #6
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IMO, tires should be inflated to their actual load "if known." Since the majority of campers (as I have found by asking) have NO IDEA what their camper weighs loaded for camping, filling the tires to their max listed is a good idea (provided the rims are rated for the pressure of course).

To get your BEST tire life, you should weigh your axles to determine the actual load on each axle. The tires on that axles should be inflated to the correct pressure for that axle's load.

For example,
Suppose your camper is running Maxxis ST225/75R15 D range tires; weighs 10,000 pounds and is carrying 8,000 pounds on the camper's axles and 2000 pounds on the pin (20% of camper weight). When you weigh your camper, the leading axle has 3800 pounds on it and the trailing axle has 4200 pounds on it. Each tire on the trailing axle has to carry 2100 pounds. Each tire on the leading axle has to carry 1900 pounds.

The camper originally came with C range Carlisles because they were "legal" with 50 PSI in them (2000 pounds average load). The original owner decided to upgrade his road hazard and tire quality by going to a D rated tire (MAX 65 PSI).

At 50 PSI, the Maxxis D can carry 2150 pounds with even footprint across the treads. So inflating the rear tires to 50 PSI will give you proper inflation to carry 2150 and provide even wear across the treads.

The leading axle tires only have to carry 1900 pounds each and "can" be inflated to 45 PSI for even tread wear. Most folks (myself included) inflate all four tires to the highest pressure required based on the highest load being carried. (also see the 10% bump below)

The "softer" tires have an added benefit of providing some measure of road shock absorption and less shaking of your prized dishes and wine glasses in the camper.

The load range D tires can also be inflated 10% OVER their required load which will allow occasional speeds above the ST rated 65MPH (per the Goodyear web site anyway). This will result in higher center wear and stiffer ride.

If you weigh each tire's load (can be done at some scales) the tires on that axle should be pressurized to highest tire's load.

While not a replacement for weighing your rig, an easy test to see where you are weight wise vs tire wear is to:

1) Using heavy chalk draw a thick line across the treads of your camper's tires.
2) Move the camper until you see chalk wearing.
3) If the chalk is gone, or evenly gone, you are at (approximately) the correct pressure.
4) If the chalk is gone in the center, higher pressure than needed
5) Chalk is gone from edges, under pressure
6) One side or the other suspension problems.
Attached Files
File Type: pdf maxxis 8008load.pdf (142.2 KB, 18 views)

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Old 06-22-2012, 08:23 AM   #7
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In Post #4 the PDF attached is a guide provided by Carlise Tire.

It recommends running their tires at max pressure all the time.

Many here have used their tires (came as OEM) have their own opinions about that manufacturer and their tires. If I still had them on my camper, I would be running them at max, too.


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