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02-17-2020, 09:00 AM
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#1
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Junior Member
Join Date: Aug 2018
Posts: 2
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Tire pressure
We have a 2017 Georgetown 335 Ds. The tire manufacturer says the cold inflation pressure should be 110 psi. The label on the wall inside our RV that gives the size for tires says the inflation pressure should be 92 psi. Should we go by the tire manufacturers recommended pressure or the RV manufacturer?
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02-17-2020, 09:15 AM
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#2
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Junior Member
Join Date: Feb 2020
Posts: 4
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With tires never exceed the PSI stamped on the sidewall of the tire. That goes for all tire, car, truck and camper. Most likely your current tires are not the ones from the manufacturer. The psi stamped on the sidewall is for the maximum pressure/weight.
Edit: Personally I'd go a bought mid way, around 100psi and watch the wear pattern, if it seems to wear more in the middle of the tread decrease psi if it wears more on the outsides increase psi.
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02-17-2020, 09:25 AM
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#3
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Junior Member
Join Date: Aug 2018
Posts: 2
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Thank you for your response. The psi stamped on the tires says 110 (cold). Not sure if that means before we hit the road because I know the pressure goes up as they get warmer. Just not sure where to set it before we leave.
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02-17-2020, 09:31 AM
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#4
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Junior Member
Join Date: Feb 2020
Posts: 4
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You can adjust it as you drive it's not that big of a deal (cold/warm)
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02-17-2020, 09:32 AM
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#5
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Senior Member
Join Date: Jan 2016
Location: x
Posts: 12,423
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cold pressure is exactly what it says set pressure before use. a good share of motorhomes have a rig weight to tire pressure chart check your pager work and if you have that follow there recommendation
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Retired Navy
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2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
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02-17-2020, 09:34 AM
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#6
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,559
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There are literally hundreds of threads and articles on this exact question for you to learn more than you ever wanted to know about tires.
If the tires are the same size and load range as stated on the placard in your RV, then that is the recommended pressure. You can use any pressure between the placard psi and the max cold psi on the tire. It depends on the actual weight of the loaded RV and can be determined by load/psi charts for your tire. The higher psi you use, the stiffer the ride will be.
Always set tire pressure when cold (before traveling more than a few miles), the increase in psi as the tire warms up while traveling is accounted for.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-17-2020, 09:37 AM
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#7
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Senior Member
Join Date: Jan 2017
Posts: 3,290
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Tire manufacturers don't know 'what' the tire is going to be used for, so they are simply providing the 'maximum' allowable for safe usage - but that has little to nothing to do with what they are mounted on - your coach manufacture has given you a much more realistic pressure since THEY know what it's being used for, and THEY know the general weight of the coach that the wheels are moving. Manufacturers also know that a more corrected pressure provides for a MUCH better and smoother ride. Running at the 'MAX' printed on the tire simply means that you are going to have the harshest and bumpiest ride possible.
My own coach has similar tires, and tire manufacturer pressures, but I'm now running the FRONTS at 85 and the REARS at 90 and have a great smooth ride for a 13 ton coach.
You can also confirm your RV manufacturers label by stopping thru a truck stop weigh station, or CAT scale, for 8-$10 dollars, and get your total weight, and your front and rear axle weights, and then compare that to the weighted pressure recommendations by your Tire manufacturer's own specs. I think you'll find that the 92psi is really close to the 'best' psi for your tires.
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The Turners...
'07 Rockwood Signature Ultralight...
two Campers and two Electric cars : )
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02-21-2020, 03:06 PM
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#8
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Member
Join Date: Mar 2010
Posts: 30
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I've always read that the trailer tires should be filled to max psi when cold. I have a 2012 FR Sierra 356RL, max wgt 14,000. It came with AKURET ST235/80R16 max psi 80, load range E. Their mfg date - 1311, so right at 10 years old!!! I might have 500 miles on them, haven't had them on the road in 15 months - and that was just 2 miles. Spider cracks all over. Found a tire service to come out some 15 miles and replace them and got 5 new Powerking towmax str II, ST235/85R16 psi 95, load range F, 12 ply - max rated load is 3960@95psi. He came out and replaced the tires - but only put in 80 pounds. He said that was all needed since I won't be on the road - just moving it 5 miles to the park lots from storage every month or 2. And maybe 10 miles to Batesville,MS to weigh it. I'm worried about moving it at such lower pressure. Trailer label shows 80 pounds but that is for the original Akuret. He didn't sell the Endurance that I wanted but these ARE for just moving short distance and I wanted to deal with him for coming out. Question is, while these tires are more than original in ply and LR, is 80 psi a safe and reasonable pressure for their 95 max psi? He said if I was going to do a trip then I could put them to 85 or 90. formerFR says - Running at the 'MAX' printed on the tire simply means that you are going to have the harshest and bumpiest ride possible. SOOOooo,,, I can run on lesser pressure than max psi? My reasoning for filling to the max is for the sidewalls and its 3960 load needs the 95psi. If I'm at 80psi, how does that load rating drop? Thanks,, Ed
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02-21-2020, 03:15 PM
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#9
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,559
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Quote:
Originally Posted by semlohde
I've always read that the trailer tires should be filled to max psi when cold. I have a 2012 FR Sierra 356RL, max wgt 14,000. It came with AKURET ST235/80R16 max psi 80, load range E. Their mfg date - 1311, so right at 10 years old!!! I might have 500 miles on them, haven't had them on the road in 15 months - and that was just 2 miles. Spider cracks all over. Found a tire service to come out some 15 miles and replace them and got 5 new Powerking towmax str II, ST235/85R16 psi 95, load range F, 12 ply - max rated load is 3960@95psi. He came out and replaced the tires - but only put in 80 pounds. He said that was all needed since I won't be on the road - just moving it 5 miles to the park lots from storage every month or 2. And maybe 10 miles to Batesville,MS to weigh it. I'm worried about moving it at such lower pressure. Trailer label shows 80 pounds but that is for the original Akuret. He didn't sell the Endurance that I wanted but these ARE for just moving short distance and I wanted to deal with him for coming out. Question is, while these tires are more than original in ply and LR, is 80 psi a safe and reasonable pressure for their 95 max psi? He said if I was going to do a trip then I could put them to 85 or 90. formerFR says - Running at the 'MAX' printed on the tire simply means that you are going to have the harshest and bumpiest ride possible. SOOOooo,,, I can run on lesser pressure than max psi? My reasoning for filling to the max is for the sidewalls and its 3960 load needs the 95psi. If I'm at 80psi, how does that load rating drop? Thanks,, Ed
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He is right, you are fine. Look at the load/psi chart at the manufacturer's website for your new tires for reassurance.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-21-2020, 03:22 PM
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#10
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Member
Join Date: Mar 2010
Posts: 30
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I'm amazed! Now to search for that load/psi chart.
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02-21-2020, 03:44 PM
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#11
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Member
Join Date: Mar 2010
Posts: 30
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Let me ask more! Should I have concern about the wheel rim holding the 95psi? The tire fits, looks great with 80ps - it won't pop out with the more pressure? The more I see the less I understand and I don't need this 40' trailer surprising me. I appreciate any feedback. Ed
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02-21-2020, 03:58 PM
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#12
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,559
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You will have to research this for yourself until you are comfortable with it.
I'll tell you my story. I went from a load range E ST tire (80psi cold max) to a load range G ST tire (110psi) in the exact same size. I had to go through the same process you are now doing.
I run them 85psi. I looked up the load table and found they hold the same weight at 80 as the LR E of the same size at 80psi. So I run them at 85 for a cushion.
Don't know what max psi my rims are designed for, they are not marked. But Im not concerned, as I'm only running 5psi above my old tires.
I have run this way for 6 months, in the AZ summer heat and the winter cold at high elevation. I love them. Much more stable for a great towing experience than my older tires.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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02-21-2020, 04:14 PM
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#13
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Member
Join Date: Mar 2010
Posts: 30
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Thanks NMWildcat. I like that thought and your experience info. I think I'll add 5 to 10 pounds to get a feel good feeling for moving to a local spot and see if anything happens. The tires max load 3960 is more than my axles ( I only assume they are 7,000# each) are rated and more than the total trailer weight.
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02-21-2020, 06:03 PM
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#14
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Member
Join Date: Mar 2010
Posts: 30
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I've been searching for trailer load inflation chart and have seen several, but the towmax tires is old and doesn't show for my st235/85r16 F/12. etrailer says to fill to the max on a trailer tire. I found some tire sites, towmaxtires.com for me, that states - The proper pressure for your RV tire may not be the maximum tire pressure. The right pressure is determined by the weight carried by each tire on the RV and the pressure recommended by the tire manufacturer for that weight.
SO YOU'RE RIGHT, by this article. I found Maxxis and Goodyear charts but alas, buy odd name get old charts. Thanks, Ed
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02-22-2020, 11:36 AM
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#15
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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Quote:
Originally Posted by semlohde
I've been searching for trailer load inflation chart and have seen several, but the towmax tires is old and doesn't show for my st235/85r16 F/12. etrailer says to fill to the max on a trailer tire. I found some tire sites, towmaxtires.com for me, that states - The proper pressure for your RV tire may not be the maximum tire pressure. The right pressure is determined by the weight carried by each tire on the RV and the pressure recommended by the tire manufacturer for that weight.
SO YOU'RE RIGHT, by this article. I found Maxxis and Goodyear charts but alas, buy odd name get old charts. Thanks, Ed
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Tire load inflation charts are standardized for all designated sizes and approved by the TRA.
https://fifthwheelst.com/documents/C...T-Modified.pdf
The tires now on your trailer are by industry standards, "Plus Sized" tires. They are required to provide a load capacity the OE tires provided according to the vehicle manufacturer's recommended cold inflation pressures. So, at 80 PSI the new tires are providing more load capacity than the OE tires did at the same 80 PSI.
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