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Open Roads Forum  >  Fifth-Wheels

 > trailer wheel weight rating/compared to tire psi rating?

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Cummins12V98

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Posted: 03/18/22 08:59am Link  |  Print  |  Notify Moderator

CapriRacer wrote:

Cummins12V98 wrote:

.....

I would like someone to explain whey they have weight inflation chart for the ENDURANCE if it's not ok to run tires pressures based on actual load. ......


Those are MINIMUMS, not recommendations.


Sure but that is what the tire is designed to support at those pressures right?

Maybe you can elaborate. Do you disagree with GY tech support or agree that a person up sizing in load range can use the chart for the best ride, tire wear and stopping by adding 5psi to the chart.

Let's forget Jerry's rim pressure rating. If you went to the GY "E" 15" would you run the tires at 80psi or use the chart plus 5psi as GY Tech recommends?


Answer this. I am around 4,500# load on each tire and the GY "H" tires were not holding up running them at 125psi with a rating of 4,805#. Now I went with the Continental's with 6,005# rating at 125psi. Would you run 125 psi or lower pressure like 100 that gives 5,200# capacity?


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Posted: 03/18/22 11:55am Link  |  Print  |  Notify Moderator

People make too much fuss over the tire scrubbing. The only time the tires are subjected to much scrubbing is when you are in a sharp turn or backing and you are going slow. 98% of the time they are running straight and not subject to scrubbing.

When I have to back into a site, the tires on my 3-axle 5er do scrub but so far, I age-out the tires long before they are worn out.

Ken


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BurbMan

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Posted: 03/18/22 03:45pm Link  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Answer this. I am around 4,500# load on each tire and the GY "H" tires were not holding up running them at 125psi with a rating of 4,805#. Now I went with the Continental's with 6,005# rating at 125psi. Would you run 125 psi or lower pressure like 100 that gives 5,200# capacity?


Some insight from CapriRacer's webpage

JIMNLIN

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Posted: 03/18/22 08:54pm Link  |  Print  |  Notify Moderator

Side scrub stress isn't about loosing tread rubber but like Capriracer and Tireman9 tell us its more about inter ply shear forces that we cant see. The best chance the tire has under those condition of not shedding a tread or breaking a inner ply is using max sidewall pressures.
Thats why tire experts and even Goodyear tells us to use max sidewall pressure unless the trailer was over tired causing a rough ride ...like using a load G tire on 5.2k -6k axles or a tire with 50 percent capacity above the gawrs.

Tireman9 rvtiresafety has several thread where he tells us about inner ply shear forces...this is jut one of his info talks...
Side scrub stress isn't about loosing tread rubber but like Capriracer and Tireman9 tell us its more about inter ply shear forces that we cant see. The best chance the tire has under those condition of not shedding a tread or breaking a interior belt is using max sidewall pressures. Thats why tire experts and even Goodyear tells us to use max sidewall pressure unless the trailer was over tired ...like using a load G tire on 5.2k -6k axles or a tire with 50 percent capacity above the gawrs.

Tireman9 rvtiresafety has several thread where he tells us about inner ply shear forces.....this is just one of them....
interply shear forces

Commercial trailer vs rv trailer tire tech ???
Not one bit of difference. Both can have the same axles/tires/wheels and gross weights.


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Cummins12V98

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Posted: 03/18/22 09:28pm Link  |  Print  |  Notify Moderator

Less weight on a tire is less force "scrubbing" I would not run a D tire at lower than max if that is what the tire weight is. If I did there would be more "scrubbing" and more chance of damage. A heavier tire will handle more stress even at lower pressures as long as the weight isn't over the inflation rating.

Simple common sense here folks.

So you EXPERTS what should I inflate my 6,005# tires to that the load is 4,500#????????? Don't seem to be getting an answer?????

NO mention of any 50% capacity from GY Tech support. I guess they have no idea what they are talking about.

Maybe one of you can tell Jerry why the outer edges of his tires are wearing much more than the rest of the tire??? No way it's from scrubbing, unless the tread compound is so poor it just peels off. Don't think that is so because he has gotten lots of miles on them.

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Posted: 03/18/22 10:42pm Link  |  Print  |  Notify Moderator

Cummins12V98 wrote:

what should I inflate my 6,005# tires to that the load is 4,500#????????? Don't seem to be getting an answer?????
I would go chart + 5 to 10 psi not to exceed the sidewall max if it is an LT or P tire. If the low weight is not on the chart I would use the lowest shown + 5psi. Run the sidewall max with an ST unless the ride seems stiff or bouncy. If there is a ride issue reduce to the chart +5.


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Posted: 03/19/22 06:50am Link  |  Print  |  Notify Moderator

eHoefler wrote:

"You have to replace the wheels to accommodate the higher pressure."

This man answered my question, right away, on first page. Not what I wanted to hear, but I think likely the correct answer.

My thread went off the track, turned foolish at one point. I may have hurt some feelings, trying to keep it on track. Hope not!!

I will answer CumminsV12, as to my tire edge wear from scrubbing, which is already described in my post on page one. Several of my tires show tread wear, on the edges mostly from my tight backing/severe side scrub, at home. I will not describe, but the black marks on my concrete driveway tells the story, as does my visible twisted wheels/suspension.

As to the tire inflation chart tire pressure, Capri was correct, a minimum. Using these minimum inflation charts, is not a one size fits all. They have charts for all types of tires. Truck tires, MH tires, single axle tires, not the same as an RV with tandem, or triple axles.

For FW tandems like mine, and some triples, also TTs, you can weigh your trailer, to get actual weight on tires, look at the RV specific chart. Now to find a very minimum, add 10% more air, could be 5 lbs maybe 10, but use 10%. Now that is a minimum, using 20% is better, if not going over sidewall max. Best of all, unless you have way more tire than needed, is to just inflate to sidewall max, for best protection from tire damage.

An ST tire gets it's strength from air pressure. To protect the belts, and avoid ply separation issues, from severe scrub, more air is better, all the way to max sidewall pressure, is recommended.

This post is not what my thread was about, but I feel is an important issue. If someone would start a new thread, maybe over on general, others may chime in with their thoughts.

Jerry





CapriRacer

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Posted: 03/19/22 06:59am Link  |  Print  |  Notify Moderator

Cummins12V98 wrote:

CapriRacer wrote:

Cummins12V98 wrote:

..... I would like someone to explain whey they have weight inflation chart for the ENDURANCE if it's not ok to run tires pressures based on actual load. ......

Those are MINIMUMS, not recommendations.

Sure but that is what the tire is designed to support at those pressures right? .....

Yes, but just barely. Not a good practice.
Cummins12V98 wrote:

.....Maybe you can elaborate. Do you disagree with GY tech support or agree that a person up sizing in load range can use the chart for the best ride, tire wear and stopping by adding 5psi to the chart. .....

I am merely saying that the tables are a minimum, not a recommendation and it looks like the GY tech support agrees with me.
Cummins12V98 wrote:

...... Let's forget Jerry's rim pressure rating. If you went to the GY "E" 15" would you run the tires at 80psi or use the chart plus 5psi as GY Tech recommends? .....

I would need some additional information. Like year, make, and model of trailer. What does the vehicle manufacturer specify? Are actual weights available?

In other words, the sort of thing a vehicle manufacturer would go through when they make their specification.

Yes, we know that some trailer manufacturers didn't do a good job of specifying tires and pressures. Is Jerry's vehicle one of them? Do we have reason to disagree with their specification?

These are all questions that I would need to make a recommendation.

Cummins12V98 wrote:

..... Answer this. I am around 4,500# load on each tire and the GY "H" tires were not holding up running them at 125psi with a rating of 4,805#. Now I went with the Continental's with 6,005# rating at 125psi. Would you run 125 psi or lower pressure like 100 that gives 5,200# capacity?

Why so argumentative?
But to answer your question, see the above for how I would do it. Your question doesn't contain the information I would seek before giving an answer.

* This post was edited 03/19/22 08:01am by an administrator/moderator *


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CapriRacer

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BarneyS

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Posted: 03/19/22 07:59am Link  |  Print  |  Notify Moderator

Come on folks, why so argumentative? This forum is for information and enjoyment - not for fighting and arguments. Disagreements are fine as long as they stay civil and not get personal. That way, we all learn something and have fun also![emoticon]
Barney


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cummins2014

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Posted: 03/19/22 01:23pm Link  |  Print  |  Notify Moderator

MFL wrote:

eHoefler wrote:

"You have to replace the wheels to accommodate the higher pressure."

This man answered my question, right away, on first page. Not what I wanted to hear, but I think likely the correct answer.

My thread went off the track, turned foolish at one point. I may have hurt some feelings, trying to keep it on track. Hope not!!

I will answer CumminsV12, as to my tire edge wear from scrubbing, which is already described in my post on page one. Several of my tires show tread wear, on the edges mostly from my tight backing/severe side scrub, at home. I will not describe, but the black marks on my concrete driveway tells the story, as does my visible twisted wheels/suspension.

As to the tire inflation chart tire pressure, Capri was correct, a minimum. Using these minimum inflation charts, is not a one size fits all. They have charts for all types of tires. Truck tires, MH tires, single axle tires, not the same as an RV with tandem, or triple axles.

For FW tandems like mine, and some triples, also TTs, you can weigh your trailer, to get actual weight on tires, look at the RV specific chart. Now to find a very minimum, add 10% more air, could be 5 lbs maybe 10, but use 10%. Now that is a minimum, using 20% is better, if not going over sidewall max. Best of all, unless you have way more tire than needed, is to just inflate to sidewall max, for best protection from tire damage.

An ST tire gets it's strength from air pressure. To protect the belts, and avoid ply separation issues, from severe scrub, more air is better, all the way to max sidewall pressure, is recommended.

This post is not what my thread was about, but I feel is an important issue. If someone would start a new thread, maybe over on general, others may chime in with their thoughts.

Jerry



We went thru all this back around 2009 on the Montana forum . Many of us had the new Montana fifth wheels with the china bomb tires on them . Most wanted to go to the Goodyear G614's , about the only game in town for a G rated tire back then . I had alloy wheels on my new 2008 Montana fifth wheel, that had no weight or psi rating on them , as many of the other Montana owners had . Anyway someone got with wheel manufacturer , and they sent us all a sticker with a 110 psi, and 3750 lb rating to stick on the wheels . That was all all fine ,and dandy , and so some of us went with the G614's . Well the wheel manufacturer decided to change their minds after the fact , I am sure it was a CYA after giving it some thought .

Anyway , I ran those wheels up until two years ago with G rated tires ,and 100-110 psi , no problems , as did many others . Thats my two cents worth. [emoticon]

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