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Old 09-15-2016, 08:14 AM   #61
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I have 16's on my fiver. Rated to 110psi for max load. Sailun told me I can run them down to 85psi and they are rated @ 3042lbs capacity at that air pressure.
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Old 09-15-2016, 02:58 PM   #62
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Originally Posted by Fingerlakes View Post
I run them @ 120psi. The dealer told me that would be ok and NEVER run them below 115psi. I plan on bumping them up to 125psi for our trip to Fla. because we'll be "loaded" up for that trip. We are about 15,300 lbs gross normally.
That's what they told me also.
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Old 09-15-2016, 03:58 PM   #63
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Couldn't find a pressure/load chart on Sailun's web site but they would have one if you asked. If you don't need the load capacity of the 125psi you won't be doing your trailer any favors. At full pressure the S637's provide about as much suspension as solid rubber tires would. Even at 100psi my trailer rides a lot rougher on the Sailuns than it did on TowMax's.
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Old 09-15-2016, 04:08 PM   #64
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I emailed back to Sailun for a pressure chart.

Nothing to be gained by running a higher pressure than you need as long as it's within the safe range for the tire. With 7k axles the tire only needs to support 3500lbs, so 3850lbs with a safety margin. Last year I was told by Sailun that the 16" S637 can be run @ 80psi and handle 3042lbs which is under the axle rating but a chart will show how much I need to go up from there.
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Old 09-15-2016, 04:18 PM   #65
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I emailed back to Sailun for a pressure chart.

Nothing to be gained by running a higher pressure than you need as long as it's within the safe range for the tire. With 7k axles the tire only needs to support 3500lbs, so 3850lbs with a safety margin. Last year I was told by Sailun that the 16" S637 can be run @ 80psi and handle 3042lbs which is under the axle rating but a chart will show how much I need to go up from there.
I just Sailuns on my triple axle Seismic, we gross out @ 20,000#. Had them set at 110 psi as indicated on sidewall. I have 7 K axles, should I go higher PSI?
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Old 09-15-2016, 05:38 PM   #66
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Sticker sent to me from dealer showing tire and axel info shows 7000 lb axels, ST23580R16-E tires and 16" rims rated at 80psi.


If I change to the GY or the much better Chinese tires to 85R16-G I think I will have to go to different rims.
Navy Chief according to Tredit, all their 8 lug, 16" wheels EXCEPT TO3's are good for 110psi.

I called them twice and talked to two different guys there.
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Old 09-15-2016, 06:00 PM   #67
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Just heard back from Sailun.

" Steve, thanks for being a Sailun customer. I am glad the tires are working well. I have attached a load / inflation table that shows the LT235/85R16 (page 1, section 2) which actually carries a little less load than your ST tires. It is pretty close so a good reference. You want to use the line marked “S” for single. Determine your load on the line and then scroll up to the top to determine the required pressure. You can load up to 3750 lbs./tire (actually 4080 for ST) at 110 psi. Based on your description of the tire being stiff, you will likely be able to remove some air. Make sure you check air pressure when the tire is cold.

Hope this helps"


From the chart:
Tire Single (S) PSI 80 85 90 95 100 105 110

LT235/85R16 S 3042(E) 3170 3300 3415 3550 3675 3750(G)


Size (MPH) D/S 90 95 100 105 110 115 120 125

215/17.5 75 S 3695 3860 4020 4180 4340 4495 4650 4806(H)


So for 17.5's on 7k axles you could run them @ 95psi and carry the weight+10%


Last time I scaled my fiver the wheels had 11,620lbs on them with near full waste tanks and empty water as we were leaving a couple of weeks boondocking.
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Old 09-15-2016, 06:04 PM   #68
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Originally Posted by Loboclone View Post
I just Sailuns on my triple axle Seismic, we gross out @ 20,000#. Had them set at 110 psi as indicated on sidewall. I have 7 K axles, should I go higher PSI?
What size tire?
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Old 09-15-2016, 06:38 PM   #69
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Navy Chief according to Tredit, all their 8 lug, 16" wheels EXCEPT TO3's are good for 110psi.

I called them twice and talked to two different guys there.
Below is the response I received from my Jayco rep after I sent my VIN and they checked the specs of the wheels. Just some info for you.

From: Lueking, Pat
Sent: Friday, August 26, 2016 7:54 AM
To: Gardner, Paul
Cc: Current, Terry
Subject: RE: Tire Question

Paul,
This unit uses tire kit# 0247397 which has the following specs:

Tire: ST235/80R16, load range 'E', tire capacity is 3520 lbs. at 80 psi.
Rim: Aluminum, 16x6 J, 8 lug, rim capacity is 3580 lbs. and 80 psi.
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Old 09-15-2016, 06:48 PM   #70
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Couldn't find a pressure/load chart on Sailun's web site but they would have one if you asked. If you don't need the load capacity of the 125psi you won't be doing your trailer any favors. At full pressure the S637's provide about as much suspension as solid rubber tires would. Even at 100psi my trailer rides a lot rougher on the Sailuns than it did on TowMax's.
I think I would prefer a little rougher trailer ride than constantly worrying about a blow out. I wouldn't think heavy duty / high capacity trailer tires would be designed with a lot of suspension qualities in mind, but that's just me.
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Old 09-15-2016, 07:25 PM   #71
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So I feel like I'm missing something in the conversation here:

For everybody that traded out their wheels from 16's to 17.5's, was that because the 637's aren't made in a 16? If so, why not go with the 637T's showing on Sailun's site? Sailun Commercial Truck Tires: S637T HD ST Trailer

Yes, the load is higher than what you may need, but not by that much, and they advertise them as a 5th wheel tire. I guess the argument only stands if the factory wheels are able to take 110 psi. I'll have to crawl under mine and see what it's stamped for!

Just trying to make sense of it, as after reading some of the posts, I'm scared to continue running my factory tires on my 377RLBH! She's heavy for sure...
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Old 09-15-2016, 09:15 PM   #72
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I personally went with the 17.5" setup over the 16" for the additional load capacity of the tires and wheels and the H rating was a plus also. The way I figure it, I'm increasing my total load capacity at the tires by about 5000# over what I had. It may be overkill but I would rather have way to much than the bare minimum (IE factory). I guess everyone has their personal preferences.
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Old 09-15-2016, 11:10 PM   #73
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What are the towmax tires people speak of?


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Old 09-16-2016, 04:42 AM   #74
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What are the towmax tires people speak of?

Original equipment tires that come on Jayco's from the factory. Prone to blowout and separation. Says "TowMax" on the sidewall.

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JetTech
I personally went with the 17.5" setup over the 16" for the additional load capacity of the tires and wheels and the H rating was a plus also. The way I figure it, I'm increasing my total load capacity at the tires by about 5000# over what I had. It may be overkill but I would rather have way to much than the bare minimum (IE factory). I guess everyone has their personal preferences.
The 17.5's give you more load capacity and if you need new wheels anyway then if you want to spend more buy the 17.5's. I considered it myself but put 16's on the stock wheels.

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So I feel like I'm missing something in the conversation here:

For everybody that traded out their wheels from 16's to 17.5's, was that because the 637's aren't made in a 16? If so, why not go with the 637T's showing on Sailun's site? Sailun Commercial Truck Tires: S637T HD ST Trailer

Yes, the load is higher than what you may need, but not by that much, and they advertise them as a 5th wheel tire. I guess the argument only stands if the factory wheels are able to take 110 psi. I'll have to crawl under mine and see what it's stamped for!

Just trying to make sense of it, as after reading some of the posts, I'm scared to continue running my factory tires on my 377RLBH! She's heavy for sure...
Sailun S637's come in a 16". I have 235/85-16's on my fiver since last fall. They are a bit taller than the stock tires but if you have enough distance between the tires you can use them.

The trailers come with 7k axles. If the tires are evenly loaded (probably not, would need to scale each wheel) then they are carrying 3500lbs each for a maximum.

Last winter I scaled my setup and had:
Truck - 5080lb front, 7640lb rear
Trailer- 11620lb

Airing tires up to carry 4800lbs/tire doesn't gain you any carrying capacity. As long as they are inflated within the safe range specified by the manufacturer it gains you no safety either. I know that with the Sailun's on vs the TowMax's things in my trailer take a lot more beating as more road bumps are transferred into the trailer.

My truck tires are max 80psi but I don't run them that high as I like some comfort. I run 65 all round unless I'm towing then I run 70 in the back.

In the end, you choose how you want to run tires depending on your comfort level.

Also, Sailun/GY614 will put a lot more deflection load on the suspension when turning tight. I cringe when backing my trailer in beside the house as the suspension gets all distorted
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Old 09-16-2016, 06:09 AM   #75
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I guess I need to clarify what I was talking about in regards to capacity.
With the increased overall load capacity of my new tires, I have NO intention of overloading my RV, I fully understand the axle rating I get it. That was not the reason for going to bigger tires. My point, which I guess I did a bad job of making is - having the extra load capacity is simply piece of mind that the tires "should" now be to handle the NORMAL loaded weight of the RV with no problem. Sorry for the confusion.
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Old 09-16-2016, 06:57 AM   #76
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I guess I need to clarify what I was talking about in regards to capacity.
With the increased overall load capacity of my new tires, I have NO intention of overloading my RV, I fully understand the axle rating I get it. That was not the reason for going to bigger tires. My point, which I guess I did a bad job of making is - having the extra load capacity is simply piece of mind that the tires "should" now be to handle the NORMAL loaded weight of the RV with no problem. Sorry for the confusion.
No, I understood what you meant. I was just saying that no point inflating the tires to a capacity way beyond the axle rating as all you get is a harsher ride. We towed about 7500mi last winter and with the condition of the roads in the US stuff took a beating with the stiffer Sailuns. Framed pictures laying in the rear cabinets had the glass smashed, drawer contents got shaken a lot, etc.
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Old 09-16-2016, 07:15 AM   #77
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Sailun S637's come in a 16". I have 235/85-16's on my fiver since last fall.
Sorry for the confusion, it's just that I didn't see a 16" on Sailun's site listed for the S637, just the S637T. Maybe we're talking about the same thing? Seems like two entirely different tires though, so was clarifying!

Great info though! I'm sure the wife is just going to love it when I tell her the tires on our new RV are junk!
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Old 09-16-2016, 07:49 AM   #78
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Sorry for the confusion, it's just that I didn't see a 16" on Sailun's site listed for the S637, just the S637T. Maybe we're talking about the same thing? Seems like two entirely different tires though, so was clarifying!

Great info though! I'm sure the wife is just going to love it when I tell her the tires on our new RV are junk!
On the Cdn site they lump them all together Sailun Commercial Truck Tires: S637 Regional All-Position

US site separates them out. The 16's are an ST tire, I expect that's what the T suffix is referring to.

Up here 4 S637's m & b incl 13% tax cost me 1100$ and I sold the OE tires to a guy with a boat trailer for 200$.
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Old 09-16-2016, 07:59 AM   #79
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Just the fact that the "H" rated tire is a "tougher" tire all around is why I went to 17.5. I drove to South Dakota and back with my stomach in a knot before buying the Sailuns hoping nothing blew out. Now I have a much more relaxed ride (and so does the wife) knowing I have much better tires back there. I guess after seeing the inflation table I won't need to bump them up for the Florida trek. Thanks for posting that info.
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Old 09-16-2016, 08:09 AM   #80
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Just wondered-- I read someone said that you could possibly do suspension damage to your RV if you are using a tire rated higher that is heavier and stiffer than your trailer is rated for? Has anyone noticed with their Sailuns if this has resulted in a bumpier ride for your fifth wheel.


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