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Old 04-12-2020, 03:13 PM   #41
mlk1950
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Originally Posted by Logan X View Post
I have been running Goodyear Endurance for about a year and a half. Probably 6k miles on them. I am very happy with them and the scuffguard on the sidewall is great. It makes them seem very stout. As CW said, I went up one load range from C to D.
I went from C's to D's on mine as well and also very happy with them.
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Old 04-12-2020, 03:17 PM   #42
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Check this one out. It is supposed to have complied with the RVIA 10% Recommendation.

5200# axle X 1.1 = 5720# divided by 2 = 2860# minimum load capacity per tire.

The ST225/75R15 LRE provides a maximum load capacity of 2830# per tire. Keystone has even miscalculated that.

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Old 04-12-2020, 03:44 PM   #43
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Originally Posted by CWtheMan View Post
Your GY LRE tires are speed rated at 87 MPH max.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
That is what the man said 140km/he = 86.9 mph..us canadians use good ole metric
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Old 04-12-2020, 05:11 PM   #44
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Originally Posted by CWtheMan View Post
Check this one out. It is supposed to have complied with the RVIA 10% Recommendation.

5200# axle X 1.1 = 5720# divided by 2 = 2860# minimum load capacity per tire.

The ST225/75R15 LRE provides a maximum load capacity of 2830# per tire. Keystone has even miscalculated that.

Attachment 26397
Please let me know if I'm looking at this incorrectly. You subtract the pin /tongue weight from gvwr then you divide the axle ratings from remainder.
So pin weight of 20%= 2280. 11400 - 2280 = 9120 on the axles that are rated for 10400 - 1040 (10%) = 9360.
That's how i look at it.
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Old 04-12-2020, 05:40 PM   #45
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Originally Posted by CWtheMan View Post
Goodyear can’t really be faulted for all of the bad reputation of the Marathon trailer tires.

I’m going to add a picture of a Keystone vehicle certification label. The trailer most likely had 5200# axle manufacturer certification. However, Keystone re-rated those axles to 5080# and installed original equipment ST225/75R15 LRD tires with a maximum load rating of 2540# each. Add to that the 65 MPH speed restriction for the marathon tires and early tire trouble was brewing when that trailer was sold.

That practice was used throughout the RV trailer manufacturing industry. Why? Because the FMVSS standard allows them to just that for RV trailer tire fitments. It still does and the only thing preventing them from continuing that action is a powerful recommendation from RVIA requiring all of their members (98% of all trailer manufacturers) to provide a 10% load capacity reserve (via inflation) above the trailers vehicle certified GAWRs.

Attachment 26390


This is exactly how my last trailer came but it had a gvwr of 10k. Poor match of tires (Trailer King) for that trailer and I paid the price. Replaced with LRE and had zero issues for 3 1/2 years. It was time to replace them (looked new) but figured I would just get a new trailer and install new tires on it.....
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Old 04-12-2020, 09:14 PM   #46
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Originally Posted by Northofu1 View Post
Please let me know if I'm looking at this incorrectly. You subtract the pin /tongue weight from gvwr then you divide the axle ratings from remainder.
So pin weight of 20%= 2280. 11400 - 2280 = 9120 on the axles that are rated for 10400 - 1040 (10%) = 9360.
That's how i look at it.
Tires are required to support the total GAWR. The RVIA 10% load capacity reserve recommendation requires the tires fitted to an axle to have a load capacity 10% above the vehicle certified GAWRs, individually. That means that a single vehicle certified axle of 4000# would require two tires with a maximum load capacity of 2200# each -via cold inflation- on that axle to meet the RVIA recommendation.
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Old 04-12-2020, 09:24 PM   #47
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Originally Posted by Nitehawk View Post
That is what the man said 140km/he = 86.9 mph..us canadians use good ole metric
Then I wonder why he said 80 PSI in place of your CDN 550 kPa?

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Old 04-12-2020, 11:54 PM   #48
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Tires are required to support the total GAWR. The RVIA 10% load capacity reserve recommendation requires the tires fitted to an axle to have a load capacity 10% above the vehicle certified GAWRs, individually. That means that a single vehicle certified axle of 4000# would require two tires with a maximum load capacity of 2200# each -via cold inflation- on that axle to meet the RVIA recommendation.
Howmuch power has the RVIA, is an individual TT- manufacturer allowed to disregard their 10% reserve prescription or advice?

I think in Europe its the same. The 2 or 4 tires on the axle minimally must be able to carry the MTM( GAWR). And that is governement law. But other organisations like VACO, ANWB advice to ad 10% reserve, but not overdo it with fi 30% ,because it gives to stif ride.


So if GVWR is fi 10000 lbs but 2 axles of GAWR 6000, the tires minimum allowed is 3000 a tire.
And not 10000-10%=9000 / 4 = 2250 lbs maxload.

But in Holland, where I live Max allowed axleload ( MTM max toegelaten aslast) can be lower then max technical axleload( MTM maximum technische aslast) . So TT- maker then can put 6000 technical max axles on and give fi max alllowed axleload of 4500, so he is allowed to put on tires with maxload of 2250 lbs .
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Old 04-13-2020, 05:46 AM   #49
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Originally Posted by jadatis View Post
Howmuch power has the RVIA, is an individual TT- manufacturer allowed to disregard their 10% reserve prescription or advice?

I think in Europe its the same. The 2 or 4 tires on the axle minimally must be able to carry the MTM( GAWR). And that is governement law. But other organisations like VACO, ANWB advice to ad 10% reserve, but not overdo it with fi 30% ,because it gives to stif ride.


So if GVWR is fi 10000 lbs but 2 axles of GAWR 6000, the tires minimum allowed is 3000 a tire.
And not 10000-10%=9000 / 4 = 2250 lbs maxload.

But in Holland, where I live Max allowed axleload ( MTM max toegelaten aslast) can be lower then max technical axleload( MTM maximum technische aslast) . So TT- maker then can put 6000 technical max axles on and give fi max alllowed axleload of 4500, so he is allowed to put on tires with maxload of 2250 lbs .
The government regulations and standards for tire fitments to RV trailer axles require the trailer manufacturer to insure that each vehicle certified axle has tires installed at the time of first sale that will support 100% of each axles maximum vehicle certified weight capacity.

To do that there is a very simple equation for them to follow and it reads; The trailer’s recommended tongue weight when added to the total vehicle certified GAWRs capacities MUST not be less than GVWR.

That recommended tongue weight is not required to be certified, but it must be published. However, it is only used one time, that’s for vehicle certification.

None of the above relates to the RVIA 10% load capacity reserves recommendation. They are a private independent membership origination. However, they do have a great deal of influence with their members, which is about 98% of all USA RV trailers displaying their approval placard.

The federal vehicle certification label establishes minimum standards for the vehicle it’s attached to. Many people have a problem with that. If they would take the time to actually read what’s displayed on the label and then read the introduction to FMVSS (standards) the vehicle manufacturer complied with and certified it, clearly shows the vehicle to be built to minimal standards.
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Old 04-13-2020, 04:43 PM   #50
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Originally Posted by CWtheMan View Post
Then I wonder why he said 80 PSI in place of your CDN 550 kPa?

Attachment 26416
In Canada we use both metric and standard measurement. If you go to the lumber yard it’s mainly standard and when you are driving it’s metric. If you are old enough you’ll remember 1973 was the conversion to metric year. Pressure for tires we also have kPa and bars.
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Old 04-13-2020, 04:47 PM   #51
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In Canada we use both metric and standard measurement. If you go to the lumber yard it’s mainly standard and when you are driving it’s metric. If you are old enough you’ll remember 1973 was the conversion to metric year. Pressure for tires we also have kPa and bars.
We use both systems down here as well, just look in anyone's tool box.
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Old 04-13-2020, 09:21 PM   #52
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In Canada we use both metric and standard measurement.
Same here except in government tire standards when one is used it is preceded by the other.
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Old 04-14-2020, 07:22 AM   #53
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P metric tires and PSI ???? Maybe that's why all our ST tires are failing so often. We're using the wrong pressure (measurement) in them....

Sort of like the need to change out for winter air before the snow flies and change back to summer air when the temps are going to stay above 50F (or is it 10C) when we change?????

Don't get me started on EST and EDT and whether it's "Spring Forward/Fall Back" or "put air in the tires in March or April" and whether to use PSI in the fall and kPa in the spring or do I have that reversed ????

Hurry up SPRING !!!!! Yes, we got about an inch of fresh snow this morning, so no air changes for a while.....
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Old 05-06-2020, 03:07 PM   #54
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So I have the Goodyear tires installed on the original steel wheels and when we were spin balancing on the machine we noticed quite a bit of wobble at the rim. We put the brand new spare wheel combination on the spin balancer and it also wobbles considerably(1/4” approximately) and it has never been used. It seems these factory steel rims are not very true. Any thoughts on aluminum rims to replace the steel ones?
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Old 05-06-2020, 03:25 PM   #55
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So I have the Goodyear tires installed on the original steel wheels and when we were spin balancing on the machine we noticed quite a bit of wobble at the rim. We put the brand new spare wheel combination on the spin balancer and it also wobbles considerably(1/4” approximately) and it has never been used. It seems these factory steel rims are not very true. Any thoughts on aluminum rims to replace the steel ones?
Put the tire/rim on the trailer axle and spin it, I bet it runs true. Trailer rims are lug centric and require an adapter to balance them. If you try to hub centric balance (use the center hole) it will not balance properly.
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Old 05-06-2020, 04:25 PM   #56
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Good idea, that makes sense.
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Old 07-18-2020, 10:03 AM   #57
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A very good tire. Get the "D" rated tire. You might want to take your trailer to a scale and get the axle weight "FULLY" loaded with water, food, camping supplies and the works. A strong sidewall will help with control, sway and trailer towing. Air to maximum - I know 80 psi is very high, but it will get good wear and run cooler.
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Old 07-18-2020, 10:43 AM   #58
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A very good tire. Get the "D" rated tire. You might want to take your trailer to a scale and get the axle weight "FULLY" loaded with water, food, camping supplies and the works. A strong sidewall will help with control, sway and trailer towing. Air to maximum - I know 80 psi is very high, but it will get good wear and run cooler.
Maximum cold inflation for LRD tires is 65 PSI.
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Old 07-19-2020, 05:44 PM   #59
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A very good tire. Get the "D" rated tire. You might want to take your trailer to a scale and get the axle weight "FULLY" loaded with water, food, camping supplies and the works. A strong sidewall will help with control, sway and trailer towing. Air to maximum - I know 80 psi is very high, but it will get good wear and run cooler.
The Goodyear Endurance ST225/75R15 is E load range, 80psi.
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Old 07-29-2020, 06:55 AM   #60
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Had Trailer King China bombs replaced and look at this price. Discount Tire wanted $130 each. Amazon at least on Trailer tires was impressive. The date code was less than 6 months old. GY tires were not worth the premium once I reviewed these for my 5k lb TT

Carlisle 6H04561 Radial Trail HD Trailer Tire - 205/75R14 105M

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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