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Old 11-17-2011, 12:55 PM   #1
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Tire Pressure Question

We have a 2010 Crusader 290 RLT 5th wheel. It originally had Road Rider ST 225/75 R 15 tires. The sticker on the side of the unit showed that the tire pressure for these tires should be 65 PSI cold. The dealer swapped out these tires and wheels for Road Rider ST 235/80 R 16's. Because the sticker on the side of the unit is for the 15's, I'm not sure what PSI I should be running in the 16's. I know I can ask the dealer but I would like to hear from someone that might be able to give me some info before I ask. I'm not the world's most trusting soul when it comes to dealer answers anyway. Thanks in advance for your help.
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Old 11-17-2011, 01:30 PM   #2
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Never trust a sticker on your car, camper, boat, or anything else. Read the sidewall on the tire, it will have a max pressure and load rating. Blow them up to the max rating , when they are cold, in other words, while sitting in the yard, in the late afternoon or early morning. Oh yea, take your bi-focals to read the tire.......lol.
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Old 11-17-2011, 01:34 PM   #3
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Quote:
Originally Posted by windrider View Post
Oh yea, take your bi-focals to read the tire.......lol.
Bi-focals?? Man, I need a 10x magnifying lens!!
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Old 11-17-2011, 01:38 PM   #4
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Thanks Windrider. It says 80 PSI max so 80 it is!! I always carry my cheaters with me.
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Old 11-17-2011, 02:14 PM   #5
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I would go with closer to 65, not 80. You may only need 60. You should find a load rating / psi chart for your tire and go from there.
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Old 11-17-2011, 02:57 PM   #6
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I'm just guessing because I really don't know but it seems like one would be better off running at the maximum (80 PSI) instead of running the risk of being underinflated at 60 PSI or 65PSI. Does that make any sense? Obviously there is an optimum PSI but it seems that would depend on the actual weight of the trailer and would be somewhere between underinflated and the safe maximum. Like I said, I'm just throwing my thoughts out there. What do you folks think?
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Old 11-17-2011, 03:09 PM   #7
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Good question. There are good reasons to run at the max: First, its what is recommended by the tire manufacturer. Second, it avoids overheating. Third, it is the right pressure for the max load for that tire, which is what ibrjet was referring to.

I am unconvinced that anyone should run at a lower pressure for their trailer tires. I can understand why some LT-E owners want to run less than 80psi on their trucks (because LT-Es can be bone jarring without a load), but does the same logic apply to trailer tires? I don't think so.
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Old 11-17-2011, 03:15 PM   #8
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Thanks to everyone who has responded today to my question. It really is helpful to know there are so many out there that are willing to help. Today was my first day in this forum but I'm sure I'll following it from now on. Thanks again.
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Old 11-17-2011, 08:33 PM   #9
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I would guess the sticker matched the max pressure for the OEM tires. D rated tires max out at 65psi. Your dealer put E rated tires (good on him) which have a max pressure of 80 psi. ST tires (per the manufacturer) are designed to be run at their max pressure. As for the truck/car tires, you should run what the sticker says if your running OEM wheels and tires. Manufacturers recommend that pressure to give you the best combination of comfort, performance and tire life. I don't make cars and I don't make tires.....so I'll take thier recommendation
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