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10-21-2020, 05:39 PM
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#1
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Member
Join Date: Aug 2017
Location: Florida
Posts: 36
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New tire air pressure
So after having a blowout on a six month old China bomb on my brand new trailer I decided to upgrade to the Goodyear endurance. My original tires had a maximum air pressure rating of 65 psi which agrees with the data plate on the trailer itself. The new tires have a maximum air pressure of 90. So my question is obviously do I keep those at 90 or do I run with the 65 psi as the trailer tag states.? My thinking is if I put 65 in tires that are rated at 90 that they would be running soft and will heat up more.
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10-21-2020, 05:51 PM
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#2
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Senior Member
Join Date: Aug 2018
Location: Richmond VA
Posts: 4,563
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Inflate ST tires to the maximum cold sidewall pressure otherwise they'll run soft, flex, and heat up.
There will be 30 guys dispute this. Ignore them.
-- Chuck
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2006 Roo 23SS behind a 2017 Ford Expedition
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10-21-2020, 07:57 PM
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#3
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Senior Member
Join Date: Jan 2018
Location: Summit Township
Posts: 885
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I agree max PSI. Helps with heat, sidewall flex, and road damage.
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2019 Hemisphere 272RL
2015 Ford F250 6.2L
2005 Jayco Bantam Flier
Hensley Hitch
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10-21-2020, 08:00 PM
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#4
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Senior Member
Join Date: Nov 2018
Location: Florida
Posts: 334
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Quote:
Originally Posted by jjcooler65
So after having a blowout on a six month old China bomb on my brand new trailer I decided to upgrade to the Goodyear endurance. My original tires had a maximum air pressure rating of 65 psi which agrees with the data plate on the trailer itself. The new tires have a maximum air pressure of 90. So my question is obviously do I keep those at 90 or do I run with the 65 psi as the trailer tag states.? My thinking is if I put 65 in tires that are rated at 90 that they would be running soft and will heat up more.
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Check the Goodyear RV inflation chart for the correct pressure based on load. Let the tire engineers be the experts.
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I wished I’d gone camping sooner in life.
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10-21-2020, 09:16 PM
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#5
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PhD, Common Sense
Join Date: Feb 2017
Location: Fairborn, OH
Posts: 1,384
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Quote:
Originally Posted by Traveling Circus
Check the Goodyear RV inflation chart for the correct pressure based on load. Let the tire engineers be the experts.
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Yeah. Go with the engineers. Of course, to use the tables, you have to know the loads on your tires. That takes effort.
Or you can just air up to the max and skip all that annoying weighing and knowing.
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10-22-2020, 10:03 AM
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#6
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Senior Member
Join Date: Jul 2017
Location: North of Seattle, WA
Posts: 17,362
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Quote:
Originally Posted by eye95
Yeah. Go with the engineers. Of course, to use the tables, you have to know the loads on your tires. That takes effort.
Or you can just air up to the max and skip all that annoying weighing and knowing.
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And then watch in the rear view mirror how the trailer tires bounce 6 inches or more off the road when you hit a bump.
In the case of the OP's tires we're talking more than a 50% OVERINFLATION for the actual load.
I wouldn't go more than 20% over the inflation pressure shown in the chart for the tire size and actual load.
__________________
"A wise man can change his mind. A fool never will." (Japanese Proverb)
"You only grow old when you run out of new things to do"
2018 Flagstaff Micro Lite 25BDS
2023 f-150 SCREW XLT 3.5 Ecoboost (The result of a $68,000 oil change )
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10-22-2020, 11:42 AM
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#7
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PhD, Common Sense
Join Date: Feb 2017
Location: Fairborn, OH
Posts: 1,384
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Quote:
Originally Posted by TitanMike
And then watch in the rear view mirror how the trailer tires bounce 6 inches or more off the road when you hit a bump.
In the case of the OP's tires we're talking more than a 50% OVERINFLATION for the actual load.
I wouldn't go more than 20% over the inflation pressure shown in the chart for the tire size and actual load.
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Yes, overinflation is far less dangerous than underinflation, but correct inflation for the load (possibly with a reasonable buffer for a potential increase in load occurring before there is a chance to reweigh) is best.
Even if one chooses to air up to the max, one should read the tables to fully understand what airing up to the max means, including the possibility of creating a 50% buffer, as you cite.
Choose to know.
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10-22-2020, 12:05 PM
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#8
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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Quote:
Originally Posted by jjcooler65
So after having a blowout on a six month old China bomb on my brand new trailer I decided to upgrade to the Goodyear endurance. My original tires had a maximum air pressure rating of 65 psi which agrees with the data plate on the trailer itself. The new tires have a maximum air pressure of 90. So my question is obviously do I keep those at 90 or do I run with the 65 psi as the trailer tag states.? My thinking is if I put 65 in tires that are rated at 90 that they would be running soft and will heat up more.
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What is the designated size of the OE tires and their replacements?
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A Trailer Tire Poster
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10-23-2020, 03:32 PM
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#9
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Senior Member
Join Date: May 2018
Location: Texas
Posts: 1,371
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Tires
Now that I have tire pressure sensors on, I notice the pressure goes up 5-6 pounds on the side that gets sun or when weather changes I upgraded my tires in load and size and run what the GY chart says plus a little. I stay close to what the original trailer specs were. I have never seen my trailer "bounce 6" off the ground LOL.
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10-23-2020, 05:32 PM
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#10
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Senior Member
Join Date: Jun 2016
Posts: 5,061
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Running at 65 PSI is probably sufficient to meet the load requirement of your trailer and shouldn't be too soft or cause the tires to heat up. With that said I made the same switch earlier this year. I tried a stretch of towing at both 65 and 90 PSI. I found the trailer was more "squirrelly" running at 65 especially on grooved pavement, so I now run at 90 PSI. Haven't experienced the trailer bouncing 6" on bumps any more than it did at 65 PSI.
Tire engineer who has posted most on RV tire issues is Roger Marble, here is a blog he posted on the issue.
https://www.rvtiresafety.net/2020/08...ssure-and.html
I found the end of the post a bit confusing and asked about it. Roger's clarification was to get the most relief from inter-ply shear, run tow-able trailers at the tire's max cold inflation pressure, especially if you have multiple trailer axles.
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Al
I am starting to think, that I will never be old enough--------to know better.
Tolerance will reach such a level that intelligent people will be banned from thinking so as not to offend the imbeciles. Fyodor Mikhailovich Dostoevsky, Russian Novelist
S.E. Mich. Flagstaff 26FKWS / 2022 F-150 3.5 EcoBoost SCrew Propride
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10-23-2020, 05:53 PM
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#11
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Senior Member
Join Date: Dec 2019
Location: South Carolina
Posts: 1,212
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FWIW.
If you call Goodyear customer service/support. They will tell you to use the charts that are on their website.
Now it's up to you to decide who to listen to.
Just saying.
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10-23-2020, 09:42 PM
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#12
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Senior Member
Join Date: Dec 2015
Posts: 294
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Quote:
Originally Posted by jjcooler65
So after having a blowout on a six month old China bomb on my brand new trailer I decided to upgrade to the Goodyear endurance. My original tires had a maximum air pressure rating of 65 psi which agrees with the data plate on the trailer itself. The new tires have a maximum air pressure of 90. So my question is obviously do I keep those at 90 or do I run with the 65 psi as the trailer tag states.? My thinking is if I put 65 in tires that are rated at 90 that they would be running soft and will heat up more.
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Your profile says 2017 Rockwood. What trailer do you have now? What I'm worried about is your wheel psi rating. 65psi on the old tires. You are talking maybe 90 on the new ones. What are your wheels rated for? Probably 80 but who knows. Sure be a shame to load your trailer and take off on that long awaited getaway and lose an entire wheel assembly because of a wheel failure. Check out your wheel rating and then with a load weight on each wheel, check the inflation charts and run with confidence.
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10-24-2020, 10:00 AM
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#13
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Senior Member
Join Date: Jan 2020
Posts: 4,866
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Quote:
Originally Posted by AFDON
Your profile says 2017 Rockwood. What trailer do you have now? What I'm worried about is your wheel psi rating. 65psi on the old tires. You are talking maybe 90 on the new ones. What are your wheels rated for? Probably 80 but who knows. Sure be a shame to load your trailer and take off on that long awaited getaway and lose an entire wheel assembly because of a wheel failure. Check out your wheel rating and then with a load weight on each wheel, check the inflation charts and run with confidence.
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The wheel (rim) itself will handle the pressure of any tire that will fit on it. It is the valve stem that is limiting.
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10-24-2020, 10:06 AM
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#14
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Senior Member
Join Date: Dec 2015
Posts: 294
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Quote:
Originally Posted by NavyLCDR
The wheel (rim) itself will handle the pressure of any tire that will fit on it. It is the valve stem that is limiting.
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OK, then why do the manufactures stamp psi rating on the rim? Maybe because the metal at the stem hole is weakening the overall rim? I really don't know, would love to see their reasoning. Maybe WMTIRE could enlighten us?
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10-24-2020, 10:31 AM
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#15
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Senior Member
Join Date: Jan 2020
Posts: 4,866
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Quote:
Originally Posted by AFDON
OK, then why do the manufactures stamp psi rating on the rim? Maybe because the metal at the stem hole is weakening the overall rim? I really don't know, would love to see their reasoning. Maybe WMTIRE could enlighten us?
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I was going on this info:
https://www.etrailer.com/question-313098.html
https://www.etrailer.com/question-230756.html
It's entirely possible their info is incorrect.
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10-24-2020, 10:39 AM
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#16
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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Quote:
Originally Posted by AFDON
OK, then why do the manufactures stamp psi rating on the rim? Maybe because the metal at the stem hole is weakening the overall rim? I really don't know, would love to see their reasoning. Maybe WMTIRE could enlighten us?
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The wheel manufacturers have the option to provide both load and PSI requirements or load requirements that will accept any PSI necessary for that wheel to provide its maximum load capacity.
The USTMA supports both methods by saying a wheel marked with a PSI value is limited to that value.
Valve stems are an independent item. Like tires and wheels, they have their limits. They can be the wheel's weakest link. Of most importance; the valve stem MUST have an inflation pressure rating that is compatible with the wheel tire assembly maximum loads.
The USTMA strongly recommends the use of steel valve stems for all RV trailer wheel assemblies.
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A Trailer Tire Poster
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10-24-2020, 10:51 AM
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#17
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Senior Member
Join Date: Jul 2013
Posts: 1,839
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Quote:
Originally Posted by NavyLCDR
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CDR, there are a lot of errors in those two links. Enough to invalidate them all together. Some are antiquated and other's are just wrong, in accordance with tire industry standards, which surely supersedes anything eTrailer says that disagrees with USTMA..
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A Trailer Tire Poster
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10-24-2020, 11:20 AM
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#18
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Senior Member
Join Date: Jul 2010
Location: Waynesville
Posts: 14,428
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Quote:
Originally Posted by Airdale
The wheel manufacturers have the option to provide both load and PSI requirements or load requirements that will accept any PSI necessary for that wheel to provide its maximum load capacity.
The USTMA supports both methods by saying a wheel marked with a PSI value is limited to that value.
Valve stems are an independent item. Like tires and wheels, they have their limits. They can be the wheel's weakest link. Of most importance; the valve stem MUST have an inflation pressure rating that is compatible with the wheel tire assembly maximum loads.
The USTMA strongly recommends the use of steel valve stems for all RV trailer wheel assemblies.
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I went through the Circle Jerk with my New under warranty Truck tire in regards to "Valve Stems"! I had a very slow leak that would set off the TPMS,so since the tires were Michelin I went to a Michelin tire dealer! They sprayed liquid on the tire and rim and said "Not our problem its the VALVE Stem GM used"! So I drove to Chevy Dealership and they Promptly replaced the Valve Stem! We were on a Long RV trip towing the TT! Youroo!!
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10-24-2020, 11:22 AM
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#19
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Senior Member
Join Date: Jan 2020
Posts: 4,866
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Quote:
Originally Posted by Airdale
CDR, there are a lot of errors in those two links. Enough to invalidate them all together. Some are antiquated and other's are just wrong, in accordance with tire industry standards, which surely supersedes anything eTrailer says that disagrees with USTMA..
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But I thought because it was on the internet, it had to be true!
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10-24-2020, 11:37 AM
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#20
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PhD, Common Sense
Join Date: Feb 2017
Location: Fairborn, OH
Posts: 1,384
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Quote:
Originally Posted by NavyLCDR
But I thought because it was on the internet, it had to be true!
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Was there a picture of Lincoln next to the information? That is the gold standard in Internet “truth”. (Actually it is the zinc-copper standard since 1982.)
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