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Old 10-31-2013, 01:45 PM   #1
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tire max load question

here it is.

the tires on my trailer are 205/75/14 load c (1740 lbs max at 50 psi)

so total carrying capacity of - 6960 lbs.

my trailers gvw - 7725 lbs.

I pointed this differecne out to the dealer. they think it is fine because the tongue weight will come off the gvw of the trailer. does this make sense?

I would think and by all that I have read, you want a tire that exceeds your gvw.

thanks for any info
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Old 10-31-2013, 01:47 PM   #2
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Yes. Makes sense, but I thought LR C tires maxed out at 44psi.
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Old 10-31-2013, 02:29 PM   #3
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It is correct to subtract the tongue/pin weight. They didn't leave you much margin though. I think I would upgrade if practical.
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Old 10-31-2013, 02:47 PM   #4
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The manufacturer usually (not always) sets the camper's GVWR by adding the dry tongue weight, or pin weight in the case of 5vers, to the axle(s) load rating.

When determining which load rated tires are required, you would want tires that would exceed the camper's axle rating...your choice how much safety factor you want.

For clarification, load range C tires have a maximum inflation pressure of 50 psi...load range D - 65 psi, load range E - 80 psi. Passenger tires have maximum inflation pressure of 44 psi.

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Old 10-31-2013, 02:54 PM   #5
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Mine is the same, weighed it and has 6613 on the tires; Fixin to order a set of Kumhos 857 before I have trouble..
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Old 10-31-2013, 03:27 PM   #6
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Quote:
Originally Posted by Dave_Monica View Post
The manufacturer usually (not always) sets the camper's GVWR by adding the dry tongue weight, or pin weight in the case of 5vers, to the axle(s) load rating.

When determining which load rated tires are required, you would want tires that would exceed the camper's axle rating...your choice how much safety factor you want.

For clarification, load range C tires have a maximum inflation pressure of 50 psi...load range D - 65 psi, load range E - 80 psi. Passenger tires have maximum inflation pressure of 44 psi.

Dave
Duh! Thanks Dave. I confused my truck "p" tires with RVs "C" tires.
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Old 10-31-2013, 04:08 PM   #7
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Mine is the same, weighed it and has 6613 on the tires; Fixin to order a set of Kumhos 857 before I have trouble..
I am thinking the same thing. I haven't signed the papers for the trailer so I am pushing for them to have the tires changed to d load rated. We will see. If it does t happen I will change them myself
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Old 10-31-2013, 04:18 PM   #8
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I am thinking the same thing. I haven't signed the papers for the trailer so I am pushing for them to have the tires changed to d load rated. We will see. If it does t happen I will change them myself
Don't back down, that's about $500-$600 out of your pocket. Make them balance them also.
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Old 10-31-2013, 04:20 PM   #9
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I am thinking the same thing. I haven't signed the papers for the trailer so I am pushing for them to have the tires changed to d load rated. We will see. If it does t happen I will change them myself
It looks like by design on the Grey Wolf 26DBH, there is 13% hitch weight (740 / 5750). That means, at GVWR you have 996 pounds of hitch weight, leaving the tires carrying 6,744 pounds which, while close, is below 6960 (4 tires, aired to max).

Keep in mind, you likely won't be running at GVWR (shocking for me to say- I know!). Figuring on a camper weight of 1,000 pounds over dry - you're at 5,872 pounds of tire weight. If you go with 1,500 pounds over dry - you're at 6,017 pounds of tire weight.

Just some things to think about before running out and swapping tires immediately.
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Old 10-31-2013, 04:43 PM   #10
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here it is.

the tires on my trailer are 205/75/14 load c (1740 lbs max at 50 psi)

so total carrying capacity of - 6960 lbs.

my trailers gvw - 7725 lbs.

I pointed this differecne out to the dealer. they think it is fine because the tongue weight will come off the gvw of the trailer. does this make sense?

I would think and by all that I have read, you want a tire that exceeds your gvw.

thanks for any info
You mean your tires are ST205/75R14 LR-C. With 14" tires there is not a lot of choice. You can go to ST205/75R14 LR-D and have extra tire capacity which means that when you run the tires at 65 they will be underloaded and with that safety margin you might get more than a couple years life.
Remember ST type tires are rated for 65 mph max. That is like an engine Redline on a tach. It's possible to exceed the max speed but you will be doing damage.
You might want to confirm the max load and max inflation limit on the wheels. Get something in writing on these limits.
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