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Old 03-11-2016, 02:11 AM   #1
cscorrell
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Recommended PSI Sailun s637

We ordered Sailun S637 ST235/80R16 for our High Country 353RL. The wheels on our 353RL are max PSI 110. We have not installed them yet. Our tire dealer said he recommends only 80 PSI. What do others in this forum recommend?
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Old 03-11-2016, 02:46 AM   #2
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We run our Sailuns at 100 PSI and have had no trouble. I don't believe I would be running 110 tires at 80. Our tire dealer (who probably isn't any more knowledgeable than yours) said we should run at least the 100. Keep us up on how they do for you.
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Old 03-11-2016, 08:27 AM   #3
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Quote:
Originally Posted by cscorrell View Post
We ordered Sailun S637 ST235/80R16 for our High Country 353RL. The wheels on our 353RL are max PSI 110. We have not installed them yet. Our tire dealer said he recommends only 80 PSI. What do others in this forum recommend?
I haven't seen a pressure/load chart for the S637s.
Glad you could find the 80-series.. Where did you get them?

I generally run 100psi in ours. That's "best guess" and is not a based on a load chart. Our RV (loaded) is well under what the rated tire capacity is, so I figure it's safe to come off a few psi. Running lower psi may actually incur more head due to more sidewall flex, but my theory is that it's a little softer ride.
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Old 03-11-2016, 09:13 AM   #4
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We have been running the Sailuns since spring '15 and have around 6-7000 miles on them. They hold air pressure better than most tires and so far show no wear. They are at 110 lbs. and I think he trailer pulls easier and we don't see any effects of rougher ride in the interior. All in all, they are a huge improvement over the original GY marathons.
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Old 03-11-2016, 09:30 AM   #5
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I do not know about those tires but in general, tires that are under inflated heat up more than tires that are properly inflated.
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Old 03-11-2016, 10:51 AM   #6
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Tires should be inflated to match the weight they are going to carry. If you do not know the weight on each tire, I recommend running them at max psi cold. It is better to be overinflated for the weight you are carrying, than under. Do not ever exceed the max psi cold rating for the tire and rim.
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Old 03-11-2016, 11:15 AM   #7
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Tires should be inflated to match the weight they are going to carry.
In the absence of an inflation chart, what does that mean if I know the weight on the tire?
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Old 03-11-2016, 11:24 AM   #8
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Originally Posted by dcg9381 View Post
In the absence of an inflation chart, what does that mean if I know the weight on the tire?
Without a chart it would be impossible to tell, but the tire will tell you what it can carry at max psi. I would use that. I had my rig weighed and the recommended pressure by the RVSEF was the chart pressure plus 2 positions on the chart. Example (based on the chart the recommended pressure was 70psi, bump up two positions on the chart and I run 80psi.) like I said it is better to be over than under, and weight can and will vary for each trip. its a built in safety buffer.
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Old 03-11-2016, 11:28 AM   #9
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Originally Posted by cscorrell View Post
We ordered Sailun S637 ST235/80R16 for our High Country 353RL. The wheels on our 353RL are max PSI 110. We have not installed them yet. Our tire dealer said he recommends only 80 PSI. What do others in this forum recommend?
ST235/80R16 tires stop at LRE. LRE ST tires have a PSI rating of 80 PSI. Maybe you are confused with the ST235/85R16 tires that have load ranges E,F &G whareas the LT235/85R16G steel cased tires have a single load capacity, (LRG), just like the ST235/85R16G which has a higher load capacity because of it's ST design.

Both of those steel cased tires have a unique, single rim size, 16x6.5".
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Old 03-11-2016, 11:56 AM   #10
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This post is just getting started so I'm going to make a technical comment.

When a RV trailer manufacturer uses a specific tire like the ST235/80R16E as their primary selection (OE) and then offers an optional size like the LT235/85R16G (trailer tire) in their brochures it is just that, an option before first sale. The trailer's certification label & tire placard MUST depict the size of the tires & rims at the time of first sale. In other words that's what the new owner accepted.

The vehicle manufacturer's rim selection for the installed OE tires may not now qualify for the optional tires offered before first sale.

If the RV trailer manufacturer uses a 6" wide rim on G614 tires and puts that information on the certification label, right or wrong, it's their responsibility. If an owner does it it's their responsibility. A savvy tire installer would probably catch the rim size error and try to sell you the proper size.

Some time ago I had a conversation with a GY tech rep about the rim size for the G614 tires. On the phone he told me the 6" wide rims would work. When I asked him for an email confirming that, he said no he couldn't do that because Goodyear publishes a single rim size for that tire, 16X6.5", and he could not certify anything other than the GY specs.
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Old 03-11-2016, 05:42 PM   #11
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In the absence of an inflation chart, what does that mean if I know the weight on the tire?
I assume you meant LT235 and not ST235. I actually have Sailun's load chart. For the LT235/80-16 it says they are rated

at 80psi for 3042lbs
at 90psi for 3300lbs
at 100psi for 3550lbs

Do you know how much weight is on each tire?
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Old 03-12-2016, 04:08 AM   #12
cscorrell
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The tires are ST235/80R16. Sailun have both 80 and 85. Here is a link to their web site and the S637T tires.
http://www.gosailun.com/MRT/Tire/S637T
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Old 03-12-2016, 04:15 AM   #13
cscorrell
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Thanks for all of your help. We got these at Call's Service in Girard, KS. They ordered them for us and installed them yesterday. We also purchased the TireTraker TT-500 from Amazon. I picked TireTraker because it uses the same charger as cell phones and reviews of TPMS seem to be good and bad for most of them. I didn't want another special charger. Setting it up was easy. Hope it works well.
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Old 03-12-2016, 07:32 AM   #14
larry337
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Originally Posted by cscorrell View Post
The tires are ST235/80R16. Sailun have both 80 and 85. Here is a link to their web site and the S637T tires.
http://www.gosailun.com/MRT/Tire/S637T
The "S" is part of the model name. So they offer the S637, which is an all position tire, and the S637T, which is a designated trailer tire. Both are 14 ply high weight capacity tires so the same load chart applies. If your weight is different from what I posted then let me know and I'll look up the PSI for you.

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Old 03-12-2016, 01:31 PM   #15
dcg9381
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I assume you meant LT235 and not ST235. I actually have Sailun's load chart. For the LT235/80-16 it says they are rated

at 80psi for 3042lbs
at 90psi for 3300lbs
at 100psi for 3550lbs

Do you know how much weight is on each tire?
I have the ST tires. I actually do know my axle weights (not my tire weights). That LT-spec reference helps.
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Old 03-12-2016, 02:39 PM   #16
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There are two sets of rules, regulations and standards for tire inflation for our highway tires. The Federal Motor Carrier Safety Administration is the one for truckers and the Federal Motor Vehicle Safety Standards is the one for our personal vehicles under 26K.

The FMCSA regulations do not have a rule for recommended inflation pressures. The results of airing the trucking industry tires to the load carried is strewn all over our highways not to mention itís not recommended anywhere in the standards or regulations for our motor vehicles or trailers.

On the other hand the FMVSS directs builders of all of our motor vehicles and trailers to set recommended cold inflation pressures for all of our OE tires. That process, in itself, sets the standard for that vehicle for as long as itís certification label is valid.

When Original Equipment tires are replaced by others of different sizes and designs the proper inflation for those replacements is to apply an inflation pressure that will allow the replacements to provide a load capacity equal or greater than the OE tires provided. Look at any tire manufacturerís tire data book and you will find that standard there. Itís an across the board tire industry standard.

There is a reason most ST tire manufacturerís donít provide tire load inflation charts. They donít want ST tire users to use them. Most will advertise max sidewall pressures are best for their tires. At one time Carlisle would only recommend max pressures for their entire line-up of ST tires.
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Old 03-13-2016, 05:27 PM   #17
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To cut through the verbage, if you know your axle weight I would run the Sailun recommended pressure, plus a bit.
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