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Old 01-28-2016, 07:32 AM   #11
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Originally Posted by Jagiven View Post
What scares me on double axle trailers you have to death the tires, if I recall correctly by 20 percent.
Do you mean "de-rate" the tires by 20%? I never heard that. But I've read that if you use LT tires, they need to be de-rated by a certain percentage.
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Old 01-28-2016, 08:50 AM   #12
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Do you mean "de-rate" the tires by 20%? I never heard that. But I've read that if you use LT tires, they need to be de-rated by a certain percentage.
I think he means "de-rate". And it's actually 10%. On the tire it's stamped as "dual configuration"; Example from a TowMax LR D 15" tire "Max load single: 2540 lbs; Max load dual: 2200 lbs", which to my mind is not "tandem".

I've never seen a really clear answer on that. I understand that for a dual configuration where the tires are side by side, they are de-rated, allegedly because of "road crown" or some other such thing, but what reason could they have for de-rating a tire in a tandem configuration?

No matter what, if you're spending the entire 1400 miles worrying about your tires, I can tell you from experience it'll be worth it to drop the money and replace them. There are enough things to worry about on a journey that long without adding tires into the mix. The dealer is unlikely to help you out here because technically, the tires are adequate, and you probably don't want the tires he has anyway. But it wouldn't hurt to ask. IMO you should look for a good brand of tire (I like Maxxis) and go up in load carrying capacity.
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Old 01-28-2016, 09:06 AM   #13
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The de-rated capacity is when the duel tires are on the same axle, as in a dually.
The load carrying capacity is not de-rated on a tandem axle rig.

Exerpt from Michelin rv tire guide pg 20:
In the load and inflation tables, SINGLE means an axle with one tire mounted on each end, while DUAL means an axle with two tires mounted on each end. In an RV application, the loads indicated represent the total weight of an axle end. When one axle end weighs more than the other, use the heaviest of the two end weights to determine the unique tire pressure for all tires on the axle. The maximum cold pressure for each axle may vary, depending on their weights. These tables are applicable for all RV axles, whether or not they are power-driven.

-------------------------------------------------------------
When using LT tires on a trailer they LCC is de-rated. Usually it's best to consult the mfg's charts for exact amount.
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Old 01-28-2016, 09:25 AM   #14
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I just double checked my tires on my 2016 x17z and the dealer (or Jayco) put on ST 205/75R14 with a max load of 1760. They seem to handle really well on the road. I also have the aluminum rims as well, so not sure if that makes a difference.
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Old 01-28-2016, 09:35 AM   #15
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Quote:
Originally Posted by norty1 View Post
The de-rated capacity is when the duel tires are on the same axle, as in a dually.
The load carrying capacity is not de-rated on a tandem axle rig.

Exerpt from Michelin rv tire guide pg 20:
In the load and inflation tables, SINGLE means an axle with one tire mounted on each end, while DUAL means an axle with two tires mounted on each end. In an RV application, the loads indicated represent the total weight of an axle end. When one axle end weighs more than the other, use the heaviest of the two end weights to determine the unique tire pressure for all tires on the axle. The maximum cold pressure for each axle may vary, depending on their weights. These tables are applicable for all RV axles, whether or not they are power-driven.

-------------------------------------------------------------
When using LT tires on a trailer they LCC is de-rated. Usually it's best to consult the mfg's charts for exact amount.
So there ya go. Dual and Tandem are different, and no de-rated capacity for tandem config. I'm glad to have some confirmation on that.
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Old 01-28-2016, 10:34 AM   #16
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Does anyone know if Maxxis tires are available in Canada/Ontario?
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Old 01-28-2016, 11:20 AM   #17
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Autocorrect on my tablet comes up with some unique word choices. I have learned I have to reread things sometimes twice, as I do not always notice the auto corrects. I like writing on my computer as it will underline any questionable words in red or blue. It at least flags me of a potential error, and not change it without my permission.

So what happened I did not add the hyphen, and it changed “derate” to “death”; So death = de-rate;

The reason that concerns me about tandem axles is that you have to de-rate the tires and axles by 11 percent due to the uneven load conditions each wheel experiences as you roll down the road, due to such things such as the crown in the road, pot holes, pulling through driveways. I did not know this information until a few months ago while starting researching tire options for my htt.

Goodyear has it noted on their website, but does not state the derate amount. Most of the tire vendors note the two ratings on their tire charts, I had to figure out the percentage. I also spoke with Dexter (axle manufacture) about it too, and they confirmed the de-rating.

I found the similar info regarding LTs also.

Weighing your RV - Goodyear RV
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Old 01-28-2016, 11:23 AM   #18
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Quote:
Originally Posted by norty1 View Post
The de-rated capacity is when the duel tires are on the same axle, as in a dually.
The load carrying capacity is not de-rated on a tandem axle rig.

Exerpt from Michelin rv tire guide pg 20:
In the load and inflation tables, SINGLE means an axle with one tire mounted on each end, while DUAL means an axle with two tires mounted on each end. In an RV application, the loads indicated represent the total weight of an axle end. When one axle end weighs more than the other, use the heaviest of the two end weights to determine the unique tire pressure for all tires on the axle. The maximum cold pressure for each axle may vary, depending on their weights. These tables are applicable for all RV axles, whether or not they are power-driven.

-------------------------------------------------------------
When using LT tires on a trailer they LCC is de-rated. Usually it's best to consult the mfg's charts for exact amount.
Norty1, while researching tire options, I found references that you have to de-rate the tires and axles for a tandem operation too, not just for dually configuration.
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Old 01-28-2016, 11:25 AM   #19
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Quote:
Originally Posted by Jagiven View Post
Autocorrect on my tablet comes up with some unique word choices. I have learned I have to reread things sometimes twice, as I do not always notice the auto corrects. I like writing on my computer as it will underline any questionable words in red or blue. It at least flags me of a potential error, and not change it without my permission.

So what happened I did not add the hyphen, and it changed “derate” to “death”; So death = de-rate;

The reason that concerns me about tandem axles is that you have to de-rate the tires and axles by 11 percent due to the uneven load conditions each wheel experiences as you roll down the road, due to such things such as the crown in the road, pot holes, pulling through driveways. I did not know this information until a few months ago while starting researching tire options for my htt.

Goodyear has it noted on their website, but does not state the derate amount. Most of the tire vendors note the two ratings on their tire charts, I had to figure out the percentage. I also spoke with Dexter (axle manufacture) about it too, and they confirmed the de-rating.

I found the similar info regarding LTs also.

Weighing your RV - Goodyear RV


That`s OK. Some of these cheap ST tires suffer a 100% death 20% into their expected life.
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Old 01-28-2016, 01:24 PM   #20
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Thanks for all the responses very helpful. If I decide to upgrade to another tire is it a big deal to go from a 24" diameter to a 26"? That seems to be the difference between my 175/80r13 and the 205/75r14
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