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Old 07-16-2011, 04:47 PM   #1
Fire5er
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Dual Pressure?

Those that have dual rear wheeled TVs, do you run the manufacture's recommended tire pressures all times, or do you put additional air pressure in when towing? Our 2011 DRW F350 indicates 60 psi for the rear dual tires for a payload of 4800 lbs.. The pin weight of our 5er is 2311 lbs.
 
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Old 07-16-2011, 05:54 PM   #2
dieselguy
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My Ford's door sticker suggests 60 psi in the rear duals. I've found that if I lower that to 55 the tires wear evenly across the tread as opposed to wearing the center more so at 60 psi.
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Old 07-16-2011, 06:26 PM   #3
Trailer Trash 2
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I run what the tire manufacture recomends, I think a hard tire roll easier, and with less friction, my dodge tires are even all the way across, now my old ford was a different story on tire ware.
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Pulling a 2004, 2980 RL an oldie but goodie.
Tow vehicle is a 2009 RED RAM 3500 DRW.
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Old 07-17-2011, 12:21 AM   #4
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I have Firestone Transforce on my Chev. 3500 DRW and run them at the reccommended 80 PSI and they are wearing evenly.
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Old 07-17-2011, 02:58 AM   #5
pineranch
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SRW, door sticker 65, when towing Monty, front 70, rear 75. I found they run cooler. This is the recommendation from my Goodyear dealer. He stated "They are 10 ply rated 3750 @ 80 psi". I figure it this way, if we add 3000 lbs to out Monty axles, we jack up the psi, why not on the truck. Door stickers are not as smart as the tire psi rating IMO.
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Old 07-17-2011, 03:09 AM   #6
gypsies2
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Run our rear duallys at 80psi . Run cooler, easier when towing. If unhooked for a long period, we drop to 65psi.




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Old 07-17-2011, 03:38 AM   #7
Delaine and Lindy
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We have Michelin's on our 3500HD and run the sidewall pressure. The correct tire pressure will help with fuel mileage and the tire will run cooler... Happy trails....
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Old 07-17-2011, 05:55 AM   #8
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I run at the door pillar recommendation. While this is less than what the sidewalls on the tires are, I don't carry as much weight as the tires are rated so I'm figuring with less PSI is matches the lesser weight. And when I'm not towing or carrying lots of weight, then I deflate them a lot(60 to 62 psi). If I have too much air, then the ride is bouncier, the ride rougher and the tires start to wear in the center.

I have a pancake compressor at home and I bring it along if I know this is going to be fluctuating. It's not unusual to tow for a day or two at the higher PSI, then drop it down when the rig is set up and we're just driving around and don't want to get bounced around.

Even though you ask about duallies and a tire as a dually has a lower rating (but at least there's twice as many tires at the rear axle, the principles are the same when picking your PSI loaded or not loaded.

Pick whichever PSI you want, then monitor the tires and the ride to make adjustments. As long as the PSI/weight rating is satisfied you should be good.
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Old 07-17-2011, 06:43 AM   #9
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3100 lbs of pin weight. I run 50 lbs in the duals. Michelin 235/80 R17. Tried lowering the pressure when not towing but I couldn't tell it.
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Old 07-17-2011, 11:10 AM   #10
Fire5er
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I ran the 2006 SRW F350 at 80 PSI when towing and then drop it down when not towing. But now with the 2011 DRW F350 I just wanted to get others experience and opinions. Thanks for all the great info and responses.
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Old 07-25-2011, 01:16 AM   #11
Rancher Will
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For many years (actually decades) we have run all of our equipment (light trucks, autos, heavy trucks, trailers, ranch equipment) with tire pressures listed on the tires. We have had no problems using this system.
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Old 07-26-2011, 04:45 AM   #12
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This is our experience with a dually. I ran my first set of tires at a higher pressure than recommended by the manufacture, both front and back. Our truck is loaded 95% of the time near the 3000 lbs in the box inclusive of pin weight. I chewed the center treads off the duals in 15000 miles while the fronts were perfect. We now are running the second set of new tires and run 60 psi in the back 75 psi in front and have run 20,000 miles on them with only 1/32 of wear accross the face of the dual tires. All through our travels rear duals ran same temp as fronts. Overinflation has its faults similar to underinflation but with different aspects.
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Old 07-26-2011, 03:10 PM   #13
Waynem
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I'm all for weighing all tires at load, then following the manufacturer's recommended tire pressure on their chart. The tire pressure for tires on the same axle should be for the heavier loaded tire. That is, the pressure is the same for tires on the same axle.

Find a happy medium on the manufacturer's chart that will allow for fluctuation.
That is, allow you to add 200-300 pounds, or be under 200-300 pounds. It may be 65 for minimum, and 80 for maximum, so if you inflate for 70-75 you have some leeway in accordance with your chart.

For every 10 degrees of temperature change there will be 1 psi of pressure change. So, going from 80 degrees to 50 degrees will only see 3 PSI of change. The revers is true also, so setting between 70-75 will allow you to drive to different climates without having to increase or lower air pressure in the tire.

A 5000 foot change in altitude will result in about 2-3 PSI difference depending on ambient temperature, but in most cases setting for a median pressure will give you the leeway to not have to adjust air in your tires constantly

My tires are rated for 110 PSI. I'm running 9400 pounds on the front axle (think SOB), 4700 per tire. They are Michelin 255/80R22.5 (expensive).

Example: for me

Wheel Wt
4700
Total Diff
95 4805 x2 9610 210
100 4975 x2 9950 550
105 5150 x2 10300 900
110 5205 x2 10410 1010

I can add 550 pounds of weight to the front axle and still be withing load range. At the lower PSI of 95 I would only be able to add 210 pounds. My comfort zone is the 100 PSI. If I were to run the 110 psi, then I would have to check for ambient changes and altitude changes and adjust accordingly.

Find your comfort zone and load chart rating, set it, and forget it, except to check air pressure with a reliable gauge before you move, or with a monitor system. I check my tires for pressure every time we move, even if only a few miles down the road.

The same holds true for your duals. It's just x2. All pressures across the axle should be the same. If one dual set requires 75 psi, then all tires across the axle require 75 psi.

Happy trails.
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