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Old 08-02-2016, 08:00 AM   #1
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Dual Capacity

Hypothetical....4 tires, each with 5000lb load capacity at 120lbs of pressure in a dule configuration, is the carrying capacity 10,000lbs or 20,000lbs. Both make sense but only one is correct, which is it?

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Old 08-02-2016, 08:01 AM   #2
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Look at the data sheet for the exact tire and that and only that will be correct.

It is not that simple.
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Old 08-02-2016, 08:23 AM   #3
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It would be 20k if thats what theybare rated. Look at the rating though as a tire will have a single rating and a dual rating on the same tire.
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Old 08-02-2016, 08:37 AM   #4
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Quote:
Originally Posted by NevadaNick View Post
It would be 20k if thats what theybare rated. Look at the rating though as a tire will have a single rating and a dual rating on the same tire.
I understand the tire rating ....a single tire is rated at so much load and as a dule it is rated just a bit higher per tire but the question is, does it add up as10,000
across the entire axel or is it doubled for each side as 20,000?

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Old 08-02-2016, 08:45 AM   #5
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It's the total for the four tires, using the "dual" rating rather than single.

Perhaps your confusion is that some tire tables give the rating for a dual pair. The Michelin RV Guide is like that, i.e. Michelin has already added up the two tires in the dual pair, so you would double that number rather than quadruple it. Goodyear, on the other hand, shows the capacity for each tire, so you multiple that by 4 to get the axle total.

In your example of 4 tires @ 5000 each (dual rating per tire), multiple by 4.
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Old 08-02-2016, 11:33 AM   #6
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Yes, they add up. As an example, a tire will read (on the sidewall) Single 5035 pounds, Dual 5000 pounds. You would then add all four at the dual weight of 5000 pounds for a total of 20000 pounds.
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Old 08-02-2016, 12:03 PM   #7
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It seems it could not be any other way, my rear end weighs 18960lbs and my Michelin tires as duals are rated at 5510.....if it were 1120 across the whole axel then my coach would not be rolling now.....however my total capability across the axel is 22040. I had to ask because several people even a mechanic told me the opposite but common sense and even the worse piss pour engineering could not be that wrong.

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Old 08-02-2016, 12:10 PM   #8
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Quote:
Originally Posted by WillandJane View Post
Hypothetical....4 tires, each with 5000lb load capacity at 120lbs of pressure in a dule configuration, is the carrying capacity 10,000lbs or 20,000lbs. Both make sense but only one is correct, which is it?

WDK
Neither if a dual situation. Check the tire manufacturers guide. Tires in a dually configuration will carry less than the sum of the tires in a single configuration.


Sorry - reread the question. I vote for 20,000 lbs.
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Old 08-02-2016, 01:26 PM   #9
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Neither is correct. Here's an example from the Michelin load and inflation table using Michelin XZE or XRV tires size 235/8022.5 LRG.

Single configuration: 4675 lbs. @ 110 psi
Single meaning an axle (powered or not) with one tire at each end.

Dual configuration: 8820 lbs. 110 psi
Dual meaning an axle (powered or not) with two tires at each end.

In this example in a dual configuration each tire is rated at about 94% of the capacity as in a single configuration.

Typically tires in a dual configuration are derated between 6% and 9% of the same tires in a single configuration

Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

The dual configuration is slightly derated as a safety factor due to the possible variations in tire diameter, slight differences in side to side load, and the fact that due to the crown of the road the outer tire may not be in full contact with the road surface.
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