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Old 08-31-2012, 09:27 AM   #1
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Max PSI

Hey guys! I was wondering how close to the max psi you run in your tires? Iv got E rated tires on my TV (80 psi max). I figure Id run 70 psi in the rears and 60 in the front. As for the trailer, Im unsure on the max psi but I figure I will put 5-10 psi under the max. Is this a good idea? I know the more air you put in, the less sidewall flex, thus less heat generation. But at the same time, more pressure means when it does heat up, the pressure will increase even more which could lead to bad things... What do you guys think?
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Old 08-31-2012, 09:34 AM   #2
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If I were towing I would keep it close to the max on the rear and maybe 10lbs less on the front. Look on the plack on the drivers side door. It will tell you what the factory recommends. My Excursion says 45 in the rear and 35 in the front and it came with D rated tires. I have E rated tires on it and I could probably get away with the factory numbers but I usually boost it up a bit. When towing I think I run 70 psi in the rear and 60psi up front and it is probably overkill. The best way is to measure time temps on the sides and in the center. When the center is running hot you have too much air if the sides are running hot then too little air. When all three temps are the same you are close. When you get over 200F slow it down.

If you are towing with a truck and you have 2000lbs of stuff in the bed then I would run the max pressure. You maybe able to find a pressure versus load chart from the tire manufacturer.

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Old 08-31-2012, 09:40 AM   #3
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Why run the max? I did 3000 miles a few weeks ago. I ran my E rated tires on my TV at 45psi. I ran my D rated trailer tires at 60 psi. I noticed when a ran them higher the pressure went up faster and they ran hotter. Max psi is not always the best. If I was putting 4000 lbs of gravel in the. Ack of my truck I would run the psi up close to max. But other than that high pressure is just to keep your tires cooler. But I found that higher pressure doesn't always mean cooler tires.


Also higher pressure makes for a rougher ride. Which AS don't like and neither do I.

And also why would you run different pressures in front and back? Keep them the same.
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Old 08-31-2012, 09:44 AM   #4
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You are right Jason if you have your tires way overinflated they will run hot in the center because that is where all the friction is. The center part of the tires is carrying more that it's share of the load. They will also wear in the center.

Perry
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Old 08-31-2012, 09:50 AM   #5
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Quote:
Originally Posted by perryg114
You are right Jason if you have your tires way overinflated they will run hot in the center because that is where all the friction is. The center part of the tires is carrying more that it's share of the load. They will also wear in the center.

Perry
I'm not talking over inflating. I run under max psi all the time. Never to the max. Reason. Tire pressure goes up as he tire warms up. So if you start at the max it will go over the max, and then you will be running an overinflated tire. I watched my tires gain nearly 4 psi in temps over 100 degrees. I also noticed if the tires started out over 60 psi they ran hotter and gained more psi also. Not sure why. Will be interesting to see what the new michelins do on our trip to Zion NP in a month.
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Old 08-31-2012, 09:57 AM   #6
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On my Chevrolet 3500 tow vehicle, I run 80 psi on the rears and 70 psi on the fronts. I am hauling a 3,000# truck camper in the bed all the time. On the 7,400# Airstream, I have Michelin 16" LT's that I run at 72 psi.

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Old 08-31-2012, 10:14 AM   #7
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The label on the tire usually says 80psi cold inflation pressure. I would assume the manufacture has already accounted for the rise in pressure with use.

I maybe running too much pressure in my tires.

Perry

Quote:
Originally Posted by purman View Post
I'm not talking over inflating. I run under max psi all the time. Never to the max. Reason. Tire pressure goes up as he tire warms up. So if you start at the max it will go over the max, and then you will be running an overinflated tire. I watched my tires gain nearly 4 psi in temps over 100 degrees. I also noticed if the tires started out over 60 psi they ran hotter and gained more psi also. Not sure why. Will be interesting to see what the new michelins do on our trip to Zion NP in a month.
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Old 08-31-2012, 10:33 AM   #8
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One man's opinion.... As inferred by some of the posts, tire pressure is load related. The real question is what the tire contact patch looks like. Running max pressure on a lightly loaded tire can cause it to dome a bit and reduce the contact patch. Tire pressure is a function of tire design and load. That's why the max pressure is expressed as being rated at max load. As the load is reduced, the tire pressure can be reduced to maintain a good contact patch. What the function of load reduction is to pressure reduction is dependent on tire design. However, the function is usually not directly related. That is, 50% max load does not call for 50% max pressure.
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Old 08-31-2012, 10:34 AM   #9
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Manufacturers publish load tables so if you need to use less then max pressure just pick the right pressure for the load. For instance the E rated tire at 80 lbs goes to D rated at 65 lbs.
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Old 08-31-2012, 10:55 AM   #10
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Im not "overinflating" them. 70 psi is under the max of 80. And I prolly didnt mention what I was haulin lol. My AS of course! 31 footer. 4680 dry weight, 580 tongue weight.

I did some calculation thing on the internet to see how much my truck would sag. According to them... less than 3/4 of an inch (.70")... hardly believeable. If thats the truth then there is hardly any weight on the back of my truck and I wouldnt NEED to run higher psi
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Old 08-31-2012, 10:55 AM   #11
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So if you are at max psi you are at max load on your tires. This would then seem you may want to get different tires as you are maxed out. I think I will find the tire chart for my Michelins and figure out my best psi as I know it's. It 80 psi.
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Old 08-31-2012, 11:02 AM   #12
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http://www.michelinrvtires.com/miche...ion-tables.jsp
For other tires the tables are nearly the same
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Old 08-31-2012, 11:07 AM   #13
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My tire size isnt on there
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Old 08-31-2012, 11:14 AM   #14
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Look here:
Michelin-Truck - Truck Tire Data Book New

According to this I can run my E tires at 45-50 psi.. To run at 80psi I would have to have a trailer that weighs 9800 #

Very interesting.. I'm betting most people are running their psi to high...
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