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Old 09-26-2021, 08:33 AM   #1
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Question Sailun 235/80(85) R16 Tires, how do you like them?

I知 planning on purchasing new tires for my Cedar Creek 34RLSA fifth wheel with a 14,500 pound GVW. Sailune tire looks good to me. Are any of you already using them? What do you think. Not sure if I知 going to choose to 80 or 85 size again looking for advice.
Bill
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Old 09-26-2021, 09:28 AM   #2
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They are a good tire. I replaced my Goodyear G614 with the Sailun S637 tires. This is my second fifth wheel to have had them installed.
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Old 09-26-2021, 10:03 AM   #3
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there is a load capacity difference between the 80 and 85 size tires. what tires and size do you currently have. why not get the same size as your current tires?
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Old 09-26-2021, 12:57 PM   #4
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Sailun tires

From what I have been able to research, there is not too much difference between the 80 and the 85s. The three things that I am aware of are the depth of tread which is 2 mm (10mm v 12mm) deeper on the 85 and the load capacity on the 85’s is 320 pounds higher. That also makes the diameter of the tire slightly larger. I think the 80 is 30.8” in diameter and the 85’s are 31.7” in diameter. Also the 85s carry slightly heavier load.
My current tire size is: ST 235/80R16 and measures roughly 30” in diameter. With the current tires that I have on, the space between the tires is 5 inches. If I put on the 85s, the space between the tires will go down to 3 1/4 inches, With the 80s it will be about 4 inches. It seems OK to me do use the 85s, but I’m not sure if that puts the wheels too close together. I like the additional load capacity of the 85s.
Sailune‘s website rates the 80 at 4080 pounds and the 85 at 4400 on a single axle. On a duel axle the 80s are rated at 3640 pounds in the 85s are 3860 pounds. I’m not sure if the duel means a double axle or four tires on a single axle.
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Old 09-26-2021, 04:11 PM   #5
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Bought these before trip home from yuma end of may before trip home.really like.Click image for larger version

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Old 09-27-2021, 07:17 PM   #6
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Sailun tires are very good just put on my 2nd set. Cardinal 5er.
The only problem I had was I guess I had them underinflated,(80 PSI) so the outside wore first, I will be running them 95 PSI and see how they go, I still ran them for a good 3 years, Mine were made in Vietnam this time not China not sure what that means.?
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Old 09-27-2021, 07:29 PM   #7
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On my third year with the Sailun tires. Highly recommend. Run numerous trips during the summer season and go to Florida from NY in the winter.
Use around 100 to 102psi cold, this turns into 110 to 112 when driving. There will be plenty of tread remaining when they age out in a couple of years. They are heavy tires and work great with my 14000 pound 5er. Hardly ever require added air which is monitored with TST.
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Old 09-27-2021, 07:58 PM   #8
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Sailing 637

Excellent tire. We have put about 6K on ours. They took very little weight to balance. Very solid towing 14k in weight, 5 th wheel. Replaced Lionheads, the sidewalls on these are stiffer.
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Old 09-28-2021, 08:20 AM   #9
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Where have to been, under a rock? Sailuns have been the goto for heavy FWs for several years now. However, we have started seeing some reports of failures with Sailuns made in Vietnam (rather than China) this past year. Do a search on "Sailun" on this and other sites, and you will be reading for days.
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Old 09-28-2021, 10:57 AM   #10
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Are all new Sailun tires from Vietnam now. Mine are from China but are at least 3 years old. What's the deal on the new ones.
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Old 09-28-2021, 11:28 AM   #11
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Quote:
Originally Posted by BillGoodwin View Post
I知 planning on purchasing new tires for my Cedar Creek 34RLSA fifth wheel with a 14,500 pound GVW. Sailune tire looks good to me. Are any of you already using them? What do you think. Not sure if I知 going to choose to 80 or 85 size again looking for advice.
Bill
The major factor for going from ST235/80R16 tires to ST235/85R16 tires is the misapplication factor. The 85s are a larger tire. When such a change is made, the industry calls it "plus sizing". There are procedures to follow to keep your trailer's specs consistent when plus sized tires are installed in place of the OE size.
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Old 09-28-2021, 11:34 AM   #12
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Originally Posted by Jack350 View Post
Are all new Sailun tires from Vietnam now. Mine are from China but are at least 3 years old. What's the deal on the new ones.
I follow tire threads closely on this and other sites. This past December I started seeing threads on multiple Sailun failures, where in the past five years, I recall only two reported failures. The recent failures all have one thing in common, which is they're made in Vietnam vice China. I don't know what it really means, and in any event, everything we post about tires is anecdotal as no entity tests ST tires.
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Old 09-28-2021, 12:44 PM   #13
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Sailun S637s have been great for the past two years.
I致e heard some issues with the there car tires but not the S637 ST tires.
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Old 09-28-2021, 01:34 PM   #14
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Anybody running the Vietnam version? How are they doing? Are they as heavy as the China version? Seems like some are hearing stories about the new version.
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Old 09-28-2021, 02:00 PM   #15
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Originally Posted by Airdale View Post
The major factor for going from ST235/80R16 tires to ST235/85R16 tires is the misapplication factor. The 85s are a larger tire. When such a change is made, the industry calls it "plus sizing". There are procedures to follow to keep your trailer's specs consistent when plus sized tires are installed in place of the OE size.

Well don稚 leave us hanging.
What is/are the procedures for plus sizing?
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Old 09-28-2021, 04:07 PM   #16
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So called plus sizing refers to up sizing a cars tire size to achieve a different handling. Upping the tires on a trailer one size, allowing for sufficient clearance, will not truly cause any adverse handling problems.
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Old 09-28-2021, 04:33 PM   #17
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Well don’t leave us hanging.
What is/are the procedures for plus sizing?
I've found that there is no way to address plus sizing RV trailer tires without getting replies about my competence on the subject. Most consumers are not familiar enough with the differences in procedures between RV trailer tires and automotive tires when it comes to plus sizing. The quote below is an industry wide guidance for plus sizing. If you have your trailer's complete owner's manual you will find it there as it has been mandated by NHTSA to be there.

Always refer to and follow the vehicle manufacturer's replacement tire recommendations.
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Old 09-29-2021, 02:14 AM   #18
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Originally Posted by BillGoodwin View Post
From what I have been able to research, there is not too much difference between the 80 and the 85s. The three things that I am aware of are the depth of tread which is 2 mm (10mm v 12mm) deeper on the 85 and the load capacity on the 85痴 is 320 pounds higher. That also makes the diameter of the tire slightly larger. I think the 80 is 30.8 in diameter and the 85痴 are 31.7 in diameter. Also the 85s carry slightly heavier load.
My current tire size is: ST 235/80R16 and measures roughly 30 in diameter. With the current tires that I have on, the space between the tires is 5 inches. If I put on the 85s, the space between the tires will go down to 3 1/4 inches, With the 80s it will be about 4 inches. It seems OK to me do use the 85s, but I知 not sure if that puts the wheels too close together. I like the additional load capacity of the 85s.
Sailune壮 website rates the 80 at 4080 pounds and the 85 at 4400 on a single axle. On a duel axle the 80s are rated at 3640 pounds in the 85s are 3860 pounds. I知 not sure if the duel means a double axle or four tires on a single axle.

It appears to me the Sailun site lists load capacity for the S637T HD ST Trailer tire sized ST235/85R16 as 4400 lb if mounted as a single tire on either end of any number of axles and 3860 lb if dual tires (AKA "duallys") are mounted on either end of any number of axles. The weight capacity for the size ST235/80R16 is listed as 4080 lb for single mount and 3640 lb for dual mount applications.
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Old 09-29-2021, 02:15 AM   #19
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I switched to Sailun ST235/85R16 on my 5er nearly five years ago, and I doubt you can buy a better tire for a heavy 5er without going to commercial wheel sizes.
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