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Old 07-30-2016, 03:48 PM   #43
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I bought the bullet and ordered the new Sailun S637 ST235/85R16 14 ply.
The tire is rated for 4080 lbs at 110 psi.

According to Sailun's Load Capacity Chart I posted previously, if I look at the LT235/85R16 (The new S637 doesn't have a load pressure chart yet) and subtract their 110 psi load from the 80 psi load I arrive at 708 lbs difference between the two pressures.

Using the max pressure of the new S637 ST of 110 psi with a load capacity of 4080 and subtract the difference of 708 lbs from the chart, I arrive at 3372 lbs load capacity at 80 psi.

I only need 3130 lbs per wheel on my 5th wheel loaded and I would still be at the max allowable 80 psi on my rims. I could push it to 85 psi that I've been already running with my Duro's without issue.

I think I've got this figured and feel good about having a heavier duty 14 ply tire on the 5er.

What say you?
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Old 07-30-2016, 04:26 PM   #44
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Great. I picked the Sailun G's for our 5er also. They're all steel construction and I love 'em.
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Old 07-30-2016, 09:14 PM   #45
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Quote:
Originally Posted by Dogpatch View Post
I bought the bullet and ordered the new Sailun S637 ST235/85R16 14 ply.
The tire is rated for 4080 lbs at 110 psi.

According to Sailun's Load Capacity Chart I posted previously, if I look at the LT235/85R16 (The new S637 doesn't have a load pressure chart yet) and subtract their 110 psi load from the 80 psi load I arrive at 708 lbs difference between the two pressures.

Using the max pressure of the new S637 ST of 110 psi with a load capacity of 4080 and subtract the difference of 708 lbs from the chart, I arrive at 3372 lbs load capacity at 80 psi.

I only need 3130 lbs per wheel on my 5th wheel loaded and I would still be at the max allowable 80 psi on my rims. I could push it to 85 psi that I've been already running with my Duro's without issue.

I think I've got this figured and feel good about having a heavier duty 14 ply tire on the 5er.

What say you?
The tire industry standard for replacement tires requires them, at the minimum, to provide the load capacity the OE tires provided via inflation pressures. The ST235/85R16G tire provides 3640# of load capacity at 80 PSI. The LT235/85R16G tire provides 3042# of load capacity at 80 PSI.

All of those steel cased tires require a minimum rim width of 6.5". Here is a picture of one with the rim width right on the tire sidewall.

http://www.irv2.com/photopost/showfull.php?photo=29709
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Old 07-30-2016, 09:27 PM   #46
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"I only need 3130 lbs per wheel on my 5th wheel loaded and I would still be at the max allowable 80 psi on my rims."

Where did you get 3130 per wheel figure? If you didn't get individual wheel weights, you could be off by a couple hundred pounds on any given wheel.

I have no concerns about the tires and never have. Still have a concern about the rim specs as I spoke to a few posts back. Hopefully everything goes ok for you but I like that 10% plus safety factor for each tire/wheel combination.

Don't like sounding like the tire/rim weight police but blowouts and rim failures happen far too often.
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Old 07-31-2016, 02:21 AM   #47
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The trailer's certification label displays the minimum tire size and inflation pressure needed to provide the load capacity needed from those tires. It's the trailer owner's responsibility to maintain those minimums.
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Old 07-31-2016, 05:30 AM   #48
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I should've read through your entire post. I not only chose the Sailun's, I upgraded the wheels so the tire could be properly inflated. Did you find a shop who will mount the higher pressure tires on the lower pressure wheels or are you mounting them yourself?
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Old 07-31-2016, 08:01 AM   #49
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Quote:
Originally Posted by Drifter59 View Post
I should've read through your entire post. I not only chose the Sailun's, I upgraded the wheels so the tire could be properly inflated. Did you find a shop who will mount the higher pressure tires on the lower pressure wheels or are you mounting them yourself?
My tire dealer is mounting them. Both they and the Sailun rep say I can run the tires at 80 psi with no issue. It's all about the load carrying capacity at the selected tire pressure.
At my calculations, I will be above my needs by at least a few hundred pounds.
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Old 07-31-2016, 08:03 AM   #50
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Good luck!
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Old 07-31-2016, 10:26 AM   #51
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Dogwatch you are getting good advice!!!
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Old 07-31-2016, 12:13 PM   #52
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Quote:
Originally Posted by Dogpatch View Post
My tire dealer is mounting them. Both they and the Sailun rep say I can run the tires at 80 psi with no issue. It's all about the load carrying capacity at the selected tire pressure.
At my calculations, I will be above my needs by at least a few hundred pounds.
The minimum load capacity for your trailer tires is 3420# ea.. Says so right on the certification label.
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Old 07-31-2016, 12:17 PM   #53
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Originally Posted by Drifter59 View Post
Good luck!
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Old 07-31-2016, 12:44 PM   #54
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Dogwatch you are getting good advice!!!
It's Dogpatch! LOL

I appreciate everyone's opinion and suggestion for concern.
That's why I started the thread here.

In looking at the Sailuns, I see they are 6.5" width. My rims are 6". The Carlisles are 6". I may have to go with them.
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Old 07-31-2016, 12:45 PM   #55
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Do the right thing. Buy new wheels and tires.
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Old 07-31-2016, 01:06 PM   #56
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New info for me. Am I seeing from your sticker that you are running a triple axle trailer?
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