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Old 04-12-2011, 05:38 PM   #1
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Tire Pressure

We just returned from picking up our new Rockwood 2306 Mini-Lite from RV Wholesalers in Ohio. We were told during the PDI that the tire pressure should be set at 50 PSI and that RVW had already checked that the tires were properly inflated during the prep. After parking today, I thought the tires looked a little low and checked the pressure with a digital gauge. The tires, which are ST175/80R13, were all between 34 and 36 PSI which, I assume, means they are badly under-inflated. Shame on me for not checking this myself before we pulled away from RVW.

I'm now wondering if we were in jeopardy of having a problem due to the under-inflated tires. We had no issues on the drive home, but I assume that, if nothing else, we would've gotten better mileage if the tires had been properly inflated. My tv averaged 22 mpg on the way out and 11 mpg pulling the trailer home.

Additionally, the laminated chart attached to the rear of the tt says my tt has a dry weight of 3678 and the maximum cargo is 954 for a total weight of 4632. Does this pertain to the tires and the maximum weight they can safely carry? If so, it sounds as though it may be wise to put fourteen inch tires on my tt. Thanks for your input.

Greg
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Old 04-12-2011, 05:43 PM   #2
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Tire pressure on your tt

Greg, Check the DOT and VIN stickers on the left front side of your TT. The DOT tire info sticker is yellow. This will tell you the correct pressure.
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Old 04-21-2011, 10:26 PM   #3
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always check your tires when they are cool
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We just returned from picking up our new Rockwood 2306 Mini-Lite from RV Wholesalers in Ohio. We were told during the PDI that the tire pressure should be set at 50 PSI and that RVW had already checked that the tires were properly inflated during the prep. After parking today, I thought the tires looked a little low and checked the pressure with a digital gauge. The tires, which are ST175/80R13, were all between 34 and 36 PSI which, I assume, means they are badly under-inflated. Shame on me for not checking this myself before we pulled away from RVW.

I'm now wondering if we were in jeopardy of having a problem due to the under-inflated tires. We had no issues on the drive home, but I assume that, if nothing else, we would've gotten better mileage if the tires had been properly inflated. My tv averaged 22 mpg on the way out and 11 mpg pulling the trailer home.

Additionally, the laminated chart attached to the rear of the tt says my tt has a dry weight of 3678 and the maximum cargo is 954 for a total weight of 4632. Does this pertain to the tires and the maximum weight they can safely carry? If so, it sounds as though it may be wise to put fourteen inch tires on my tt. Thanks for your input.

Greg
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Old 04-22-2011, 12:51 AM   #4
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ALWAYS READ THE SIDEWALL ON THE TIRE!!!!!! Never believe a sticker on a trailer. LOOK AT THE TIRES!!!!! The dealer may have swapped tires, factory may have installed wrong tires. LOOK AT THE TIRES!!!!. No your gas mileage would not have increased. Did I mention, READ THE SIDEWALL INFORMATION ON THE TIRES!!!!! Your weight and tire size suggest load range "B" tires, in which case 35 psi is about max. CHECK THE SIDEWALL on the tires and look for "load range" and also max "inflation pressure" Sorry if I'm over stressing this, but if you have a tire problem, they will ask what pressure you were running and where did you get the info. If you say from a sticker on the trailer, the tire manufacturer is gone because you did not follow inflation instructions printed on the tire.
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Old 04-22-2011, 07:51 AM   #5
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While Skip is correct that tires are ALWAYS checked COLD, the pressure would have gone UP not down when checked hot. Boyle's Law of Gases.

If the tire was checked hot at 36 PSI, they were severely under inflated. I hope the trip was a short one. I would complain bitterly, and yes I would be a PITA until they documented it in your jacket.

IMO, (NOT a tire guy; but have had a tread separation at speed), those tires could be damaged.;ESPECIALLY, if they were driven at high speed for a long distance.

Anecdote:
I had to get involved with my tire dealer when I bought tires for my truck. The mounting machine they use did not go to 80 PSI, so the mechanic was going to mount them at 50 PSI; the highest the machine could go. I insisted I wanted 65 in the front and 80 in the rear. The mechanic whined, "but I will have to do another step to do that!" Sheesh...
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Old 04-22-2011, 09:19 AM   #6
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You will be fine.

50 PSI is the maximum pressure the tire can hold. The sidewall will be marked with the maximum PSI the tire can hold and the corresponding weight the tire can bear at that pressure. As the pressure decreases, so does the tire's load bearing capability.

Here is a tire inflation chart from Goodyear which gives the the load bearing capability of their tires at given pressures.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf

You had just picked it up, so it should be empty. The dry weight is 3678, but lets add 400 for optional equipment, so that brings you to 4078. Subtract about 400 for tongue weight and that leaves the axles supporting about 3678. I believe that trailer is a tandem axle, so you have four tires. Although weight is never equally distributed in an RV or most vehicles for that matter, that makes each tire roughly supporting 919.5 pounds. According to Goodyear's chart (most manufacturer's will be similar), 30 PSI is sufficient to bear that weight.

Of course, if you have the cheap Carlisle tires which come with many new RVs or any Chinese manufactured tire........you are on borrowed time anyway, but that is another story!
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Old 04-22-2011, 09:28 AM   #7
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Thanks Glenn, a masterful addition.
You get a thumbs up from me.
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Old 04-22-2011, 10:46 AM   #8
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Thanks Glenn, a masterful addition.
You get a thumbs up from me.
hit the "thanks" button!!
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Old 04-22-2011, 11:11 AM   #9
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You picked it up in Ohio,and went to PA. Wonder what the tire press was from Elkhart,IN to RVW???? Youroo!!
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Old 04-22-2011, 01:24 PM   #10
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Tire pressures vary quite a bit with temperature. That may be part of the problem depending on the ambient temperature at which they were originally checked and the ambient temperature at which the OP checked.

When I check the "cold pressure" on the trailer tires on a 115 degree Phoenix day and then drive to a camping area at 9500' in the White Mountains of Arizona and check them the next morning at 45 degrees, they will be 10 to 12 PSI less. If I leave them alone and return to Phoenix they will be back to the original pressure. If I were to fill them back up at the colder temperature, when I return to Phoenix I will find they are now over inflated.

That is one reason some people prefer Nitrogen filled tires, they do not vary pressure as much with changes in temperature. In hot climates, I usually keep the tires a few PSI above where I think they should be and at colder climates allow them to be under a little. In moderate temperatures they will be right on. Otherwise I would constantly be changing tire pressure.
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