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Old 11-11-2017, 12:15 PM   #1
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Tire Rating?

I have read some posts here about tires and load range etc.
But I have a question on single versus dual.
I'm trying to get it into my brain, why, a dual mount tires load range is lower than a single. Seems to me if you have two tires on the same axle it would handle more weight. According to the tire specking, looking for the right word here, it is not. Help me out here. Why does a dual application handle less weight? Or, is that per tire. My steering tires say, Max Load Single, 4540 @ 110 psi. Max Dual Load, 4300 @ 110 psi.
I'm thinking and typing as I go here trying to figure it out. Kind of like forum brain storming.

Here is a link I found on truck tires I thought Interesting.
https://az184419.vo.msecnd.net/schne...dRangeGvsH.pdf

Thank you for your patience.
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Old 11-11-2017, 12:23 PM   #2
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It's the rating of the single tire in that position. The set of dual would be good for 8600 lb.
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Old 11-11-2017, 12:30 PM   #3
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I've been to Cape Cod. Nice place.
Ok got ya on that. But why wouldn't the rating be double the single rating?
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Old 11-11-2017, 12:42 PM   #4
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I've been to Cape Cod. Nice place.
Ok got ya on that. But why wouldn't the rating be double the single rating?


The idea behind the lower weight rating when in dual service is because of the close proximity of the tires causes a greater heat buildup and retention.
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Old 11-11-2017, 02:21 PM   #5
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The idea behind the lower weight rating when in dual service is because of the close proximity of the tires causes a greater heat buildup and retention.
And road crown.
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Old 11-11-2017, 04:32 PM   #6
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Road Crown. I know what that is, but what does that do to the tires?
The only thing I can think of is that it would Lean, like in Lean over, the weight, gravity. My guess. Shrugs shoulders.
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Old 11-11-2017, 07:54 PM   #7
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Road crown is just that, a crown. The crown is curved and has shown that the inner tires of the four on the drive axle sometimes carry more weight than the outer tires. To allow for that and less cooling effect due to being close to another heated tire, tires are derated to prevent overloading and overheating them.
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Old 11-12-2017, 04:59 PM   #8
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Originally Posted by edge68474 View Post
I have read some posts here about tires and load range etc.
But I have a question on single versus dual.
I'm trying to get it into my brain, why, a dual mount tires load range is lower than a single. Seems to me if you have two tires on the same axle it would handle more weight. According to the tire specking, looking for the right word here, it is not. Help me out here. Why does a dual application handle less weight? Or, is that per tire. My steering tires say, Max Load Single, 4540 @ 110 psi. Max Dual Load, 4300 @ 110 psi.
I'm thinking and typing as I go here trying to figure it out. Kind of like forum brain storming.

Here is a link I found on truck tires I thought Interesting.
https://az184419.vo.msecnd.net/schne...dRangeGvsH.pdf



Thank you for your patience.
Dual tires do not add much if anything to the weight rating of the rig. First off they add 150lbs or so. What they do is add stability to the MH. If you check the rating of 2500 and 3500 series PU trucks you will see what I am saying. If a person on a ranch or farm uses dirt roads allot he would benefit from a dually. MH's benefit mostly from a smoother ride and more stability when passing our friends the Truckers.

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Old 11-12-2017, 05:13 PM   #9
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Originally Posted by Crasher View Post
Road crown is just that, a crown. The crown is curved and has shown that the inner tires of the four on the drive axle sometimes carry more weight than the outer tires. To allow for that and less cooling effect due to being close to another heated tire, tires are derated to prevent overloading and overheating them.
WA DOT quit building roads with a "crown" (parabolic curve) back in the 1970's. They now use a straight slope measured in .10 per foot of run. Usually use .02' per foot of lane width.
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Old 11-12-2017, 05:20 PM   #10
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Originally Posted by edge68474 View Post
I have read some posts here about tires and load range etc.
But I have a question on single versus dual.
I'm trying to get it into my brain, why, a dual mount tires load range is lower than a single. Seems to me if you have two tires on the same axle it would handle more weight. According to the tire specking, looking for the right word here, it is not. Help me out here. Why does a dual application handle less weight? Or, is that per tire. My steering tires say, Max Load Single, 4540 @ 110 psi. Max Dual Load, 4300 @ 110 psi.
I'm thinking and typing as I go here trying to figure it out. Kind of like forum brain storming.

Here is a link I found on truck tires I thought Interesting.
https://az184419.vo.msecnd.net/schne...dRangeGvsH.pdf



Thank you for your patience.
Dual tires do not add much if anything to the weight rating of the rig. First off they add 150lbs or so. What they do is add stability to the MH. If you check the rating of 2500 and 3500 series PU trucks you will see what I am saying. If a person on a ranch or farm uses dirt roads allot he would benefit from a dually. MH's benefit mostly from a smoother ride and more stability when passing our friends the Truckers.

Q
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Old 11-13-2017, 06:50 AM   #11
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Originally Posted by Quincy View Post
Dual tires do not add much if anything to the weight rating of the rig. First off they add 150lbs or so. What they do is add stability to the MH. If you check the rating of 2500 and 3500 series PU trucks you will see what I am saying. If a person on a ranch or farm uses dirt roads allot he would benefit from a dually. MH's benefit mostly from a smoother ride and more stability when passing our friends the Truckers.

Q
Are you really saying that other than stability, the dual tires on the 22,000# rear axle of my motorhome contribute very little to achieving its rating?? Did I misunderstand your point??
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Old 11-13-2017, 07:00 AM   #12
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Replace the dual tires for a single tire.
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Old 11-13-2017, 07:11 AM   #13
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OK thanks. I think I'm getting this. One other question. Where do I find on my coach, the tag or whatever, the maximum weight, gvw, gvwr etc. where is that bugger?
Thank you.
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Old 11-13-2017, 07:18 AM   #14
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OK thanks. I think I'm getting this. One other question. Where do I find on my coach, the tag or whatever, the maximum weight, gvw, gvwr etc. where is that bugger?
Thank you.

Mine has been in the rear bedroom closet on the last three coaches.
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