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02-18-2023, 01:54 PM
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#1
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Junior Member
Join Date: Feb 2023
Location: McDonough
Posts: 15
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Tire capacity question
What would be load rating of a tire at 65psi, if the load rating is 2235 at 80 psi. The million dollar question is at 65 psi will the tires safely tow a fifth wheel with a hitch weight of 1910 pounds. Ram dually with specs on rear tires inflated to 65 psi.
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02-18-2023, 02:34 PM
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#2
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Senior Member
Join Date: Apr 2019
Location: Henniker
Posts: 2,169
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Personally, I would only set tire pressure at the level specified on the tire and loading information sticker whether on the truck or trailer. If I am not loaded and/or towing for a longer period of time, I will drop my tire pressure on the truck (like they are now since it’s winter). My trailer tire pressure is ALWAYS set according to the sticker, period.
If you are trying to soften the harsh ride of a 1 ton dually, it probably isn’t going to happen.
__________________
Rob & Amy
2019 Passport 240BH SL (for sale)
2024 Cougar 29BHL (Taking delivery 5/15/24)
2022 Ford F250 7.3L Godzilla Crew Cab FX4
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02-18-2023, 02:43 PM
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#3
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Site Team
Join Date: Oct 2011
Location: Joppa, MD
Posts: 11,752
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Quote:
Originally Posted by Rving life
What would be load rating of a tire at 65psi, if the load rating is 2235 at 80 psi. The million dollar question is at 65 psi will the tires safely tow a fifth wheel with a hitch weight of 1910 pounds. Ram dually with specs on rear tires inflated to 65 psi.
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For what purpose? If your rims are only rated for 65 psi max then but D tires and inflate to the placard pressure. If your rims can handle 80 psi and you wish to upgrade from a D to E tire then fully inflate to 80 psi.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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02-18-2023, 02:45 PM
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#4
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,347
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I have always used the max pressure on the sidewall of my truck tires when hooked up to the fiver.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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02-18-2023, 08:32 PM
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#5
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,223
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Quote:
Originally Posted by Rving life
What would be load rating of a tire at 65psi, if the load rating is 2235 at 80 psi. The million dollar question is at 65 psi will the tires safely tow a fifth wheel with a hitch weight of 1910 pounds. Ram dually with specs on rear tires inflated to 65 psi.
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Where do you get 2,235# rating?
Our 2016 Ram dually has 235/80-16 E rated tires Load at 80 psi is 3,085# single and 2,835 dual.
So at 80 psi the four tires would support 11,340#, the payload sticker stated to inflate rear tires to 65 psi to support the axle rating of 9,750# so each tire only needs to support 2,437.5#.
You might check that you have the correct tire size and load range on your Ram DRW.
We have a pin of 2,700#, and run the rear tires at about 55 psi when towing.
__________________
Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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02-18-2023, 10:28 PM
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#6
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Senior Member
Join Date: May 2018
Location: Mechanicsville
Posts: 478
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Quote:
Originally Posted by Rving life
What would be load rating of a tire at 65psi, if the load rating is 2235 at 80 psi. The million dollar question is at 65 psi will the tires safely tow a fifth wheel with a hitch weight of 1910 pounds. Ram dually with specs on rear tires inflated to 65 psi.
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You don't state the tire size here. It's easy knowing the size, you just plug in the numbers to Michelin's or other brand's "pressure and load" chart. You can also find the same info on sites like Tire Warehouse web site. It's all there.
One other note, trailer tires are a completely different animal. They are LOAD rated tires and are meant always to run at maximum rated pressure, unlike vehicle tires which have more flexible side walls and are able to to run at different pressures according to the vehicle specs.
Also running pressures to low creates excessive heat and can lead to early failure. If you are towing I'd always error on the side of the higher pressure...it's safer than running to low.
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02-18-2023, 11:08 PM
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#7
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Senior Member
Join Date: Feb 2010
Location: Taylors, SC
Posts: 3,031
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Quote:
Originally Posted by rhagfo
Where do you get 2,235# rating?
Our 2016 Ram dually has 235/80-16 E rated tires Load at 80 psi is 3,085# single and 2,835 dual.
So at 80 psi the four tires would support 11,340#, the payload sticker stated to inflate rear tires to 65 psi to support the axle rating of 9,750# so each tire only needs to support 2,437.5#.
You might check that you have the correct tire size and load range on your Ram DRW.
We have a pin of 2,700# and run the rear tires at about 55 psi when towing.
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The proper nomenclature for your tires is LT235/85R16. The LRE have a maximum load capacity of 3042# at 80 PSI. All ST/LT designated tires weight ratings are by the load range lettering system.
The correct inflation pressures for your OE tires are found on the vehicle certification label, vehicle tire and load placard and in the vehicle owner's manual. (Tow vehicles may have vehicle manufacturer supplemental tire inflation placards).
The USTMA standards manual will tell you to NEVER use less inflation pressures than recommended by the vehicle manufacturer.
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02-18-2023, 11:16 PM
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#8
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Senior Member
Join Date: Apr 2012
Location: Portland, OR
Posts: 4,223
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Quote:
Originally Posted by CWtheMan
The proper nomenclature for your tires is LT235/85R16. The LRE have a maximum load capacity of 3042# at 80 PSI. All ST/LT designated tires weight ratings are by the load range lettering system.
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Get your facts straight, the numbers are directly off the tire sidewall. These are LT truck tires mounted on a Ram 3500 DRW.
The OP also stated these were on the Ram DRW.
__________________
Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360
Visit and enjoy Oregon State Parks
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02-18-2023, 11:34 PM
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#9
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Senior Member
Join Date: Feb 2010
Location: Taylors, SC
Posts: 3,031
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Quote:
Originally Posted by rhagfo
Get your facts straight, the numbers are directly off the tire sidewall. These are LT truck tires mounted on a Ram 3500 DRW.
The OP also stated these were on the Ram DRW.
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My facts are correct. Load index numbers on LT tire sidewalls are for the purpose of adding the tire's speed letter.
It would be a double standard to go by the load index numbers when a load range letter is molded into the tire sidewall.
If your tire is a 235/85R16 - I've never seen that size designation - it's a European designation for a passenger tire. They all use the load index numbering system for load capacity.
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02-19-2023, 03:41 AM
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#10
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,837
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Before joining the forum i never imagined that tire specifications and choices were one of the topics that could cause a fight to breakout in a bar
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2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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02-19-2023, 04:21 AM
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#11
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,692
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Quote:
Originally Posted by jasin1
Before joining the forum i never imagined that tire specifications and choices were one of the topics that could cause a fight to breakout in a bar
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Another Corona and lime please...
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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02-19-2023, 06:52 AM
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#12
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Senior Member
Join Date: Feb 2010
Location: Taylors, SC
Posts: 3,031
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My RAM dually had LT235/80R17 LRE tires. 80 PSI for those tires WAS 3085#.
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02-19-2023, 07:01 AM
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#13
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Member
Join Date: Jan 2023
Location: Kankakee
Posts: 84
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No benefit to running a tire under rated pressure.
At 80psi, a 265/75R16 10ply itire will carry 3,085 pounds of load.
At 60 psi on a 10ply tire, the tire's load carrying capacity is reduced to 2,314 pounds per tire. from https://www.yournexttire.com/trailer...flation-chart/
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2013 Keystone Bullet Premiere 33 BLPR
2012 Ram 2500 with Ram Boxes
Army, 7th ID 7th MP Co
Retired LEO
9-1-1 Director
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02-19-2023, 08:44 AM
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#14
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Senior Member
Join Date: Oct 2014
Location: Germantown, TN
Posts: 6,332
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Sometimes I feel like a Libertarian trying to join a political argument after too many Coronas.
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Jim in Memphis, Wife of 51 years is Brenda
2019 F450 6.7 Powerstroke
2018 Mobile Suites 40RSSA
2021 40' Jayco Eagle
2001 Road king w/matching Harley sidecar
2021 Yamaha X2 Wolverine 1000
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02-19-2023, 08:48 AM
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#15
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Senior Member
Join Date: Jul 2013
Location: Liberty, Texas
Posts: 5,034
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When driving unloaded for any amount of time I run my Ram rear tires down to 42PSI from the placard spec of 65PSI. The fronts stay at 80PSI to support the heavy diesel.
If I don't air down the rears it's a spine jarring ride. At 42PSI it's somewhat better.
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2018 Ram 3500 Laramie CC DRW LWB 4X4 Cummins Aisin 3.73
Reese Goosebox 20K
2018 Heartland Landmark 365 Oshkosh
2008 Bigfoot 25C9.4 LB Cabover
2023 CanAm Defender SXS
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02-19-2023, 08:51 AM
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#16
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Senior Member
Join Date: Nov 2017
Location: Mico, TX
Posts: 7,467
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This is starting to sound familiar... Since everyone owns tires, everyone seems to be an expert. Why do OEMs put a tire inflation placard on every vehicle.
OP... read the tire inflation placard on your vehicle and abide by what it says. Can't go wrong if you have the original size tires.
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wiredgeorge Mico TX
2006 F350 CC 4WD 6.0L
2002 Keystone Cougar 278
2006 GL1800 Roadsmith Trike
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02-19-2023, 11:46 AM
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#17
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Junior Member
Join Date: Feb 2023
Location: McDonough
Posts: 15
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2235# is off the tire for dually rating. Bridge Duravis 500 tires
235/80/17 tire on Ram.
I was able to locate load rating table on tire for different psi levels.
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02-19-2023, 12:12 PM
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#18
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,347
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I haul my fiver with the max pressure for the highest load rating. Had a rear inner tire go BOOM in Missouri with the old fiver hooked on. Was able to ease off the road and change to the spare. if I was at a lower pressure/load rating it might not have turned out the same. JMHO YMMV
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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02-19-2023, 12:26 PM
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#19
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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Quote:
Originally Posted by Rving life
2235# is off the tire for dually rating. Bridge Duravis 500 tires
235/80/17 tire on Ram.
I was able to locate load rating table on tire for different psi levels.
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Something to consider:
Way back when, Ford and Firestone were "implicated" in a recall for "rollover crashes with the Explorer SUV when using Firestone tires"
Seems that Ford "recommended" setting the tire pressure lower than Firestone's recommended low setting for those tires when used in an applicaton for that vehicle.... As I understand it, Ford's recommended pressure "was on the Firestone load/pressure chart by axle/wheel weight listings" but was "too low for the application, even though it was reflected "on the chart"...
You might consider that even though the tire load/pressure chart goes down low enough to list a weight that can be supported by a pressure (a number that fits in a box), it may not be safe to run at that pressure when towing a trailer, given the dynamics of the forces a trailer exerts on the stability of a tow vehicle.... Ford "discovered" that when Explorers started landing wheels up when operated at conditions that Ford hadn't tested "on the track"...
So, airing down for a softer ride may not maintain the stability in all driving situations.
Just something else to consider when "going solo outside the manual's recommendations".....
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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02-19-2023, 12:40 PM
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#20
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Senior Member
Join Date: Aug 2020
Location: Upper Chesapeake Bay
Posts: 4,837
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I have a 6x12 cargo trailer that i recently started using again…new carlisle C rated tires ..it’s a single axle..i ordered carlisle D rated but they were back ordered from walmart so i went with the stock rated tires for now.
since the tires sit outboard of my truck i use, i can watch the tire deflection…trailer isn’t loaded heavy but interesting to see how much the tires bulge out when going over bumps..was looking at trans eagle 10 ply to replace as they were recommended by Big Truck Big RV youtube
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2020 Cougar 315 RLS
2020 Ram 3500 6.7HO 4.10 Dually Aisin
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