110 psi wheels

[Jwill12]

I have a 2018 cougar 368mbi, I am wanting to upgrade to a g rated sailun tire but am unsure if the wheels will handle the 110 psi increase? If they will not, does anyone know where I can find 16x6 lug wheels that will?

[flybouy]

Your wheels should be stamped on the back with the max weight and psi. There are lots of places to buy trailer wheels, recstuff.com, sendelwheel.com, etrailer.com, are but a few.

[captcolour]

Sendel wheels period. I had Hispec wheels which cracked after a few thousand miles. Replaced them with Sendel. No issues.

[roadglide]

I have 8 lug cast aluminum spoked rims there stamped 110 psi back side but the weight stamp seemed to be less then 3500 lbs each for the 7 k axels . I’m using G tires at 105 psi.

[Hblick48]

Our rig came with alloy wheels and load range E tires, inflated to 80psi. Upgraded to load range F, 95psi. Toward the end of a coast to coast trip, one tire started to lose pressure. Turned out that wheels were rated up to 85psi, and air actually found a path through the wheel.

Replaced the alloy wheels with steel rims. Also installed metal valve stems that are rated to 110psi. Alloy wheels are always stamped with maximum air pressure. Steel ones aren't usually stamped but can easily handle 110psi.

Good that I upgraded wheels because just installed G rated tires, and wheels weren't an issue. Going to get rig weighed and inflate tires per chart.

[CWtheMan]

Originally Posted by Jwill12

I have a 2018 cougar 368mbi, I am wanting to upgrade to a g rated sailun tire but am unsure if the wheels will handle the 110 psi increase? If they will not, does anyone know where I can find 16x6 lug wheels that will?

I doubt you'll find any.

Wheel size and specs are dictated by the tire manufacturer. In this reference you will see what Sailun has to say about wheels for their steel cased tires.


http://gosailun.com/MRT/Tire/S637T

[Hblick48]

This wheel should work:

https://www.etrailer.com/Tires-and-W...519166060.html

They also have others with 6 lug. Any steel wheel with the proper valve stems should handle 110psi G rated tires.

[Dave W]

235/85-16 Sailuns at 80 psig have a load capacity of 3640. At 110psig, their capacity is 3970 or only 330 pounds more just for some pretty expensive wheels. My finger is poised over the Simple Tire 'BUY' button, waiting for the snow to go away and they then will go on the four 80 psig wheels on our 5er

[Jwill12]

So is it better to just buy the Goodyear endurance for the trailer rated at 3650 than to run sailuns at such a low pressure? And is 3650 enough for my trailer which has a gvwr of around 13900?

[CWtheMan]

Originally Posted by Jwill12

So is it better to just buy the Goodyear endurance for the trailer rated at 3650 than to run sailuns at such a low pressure? And is 3650 enough for my trailer which has a gvwr of around 13900?

Your trailer has 6000# axles. Your OEM tires are providing a little more than 16% in load capacity reserves at 80 PSI.

If you don't like the original brand, get one you have more confidence in. There is simply no reason to go to a super over kill load capacity when you already have more than the recommended load capacity reserves.

Your axles do not carry the GWVR, they carry the maximum total of the combined GAWRs (12000#). Load management is the responsibility of the vehicle owner.

[sourdough]

Originally Posted by Jwill12

So is it better to just buy the Goodyear endurance for the trailer rated at 3650 than to run sailuns at such a low pressure? And is 3650 enough for my trailer which has a gvwr of around 13900?

CW provides some good guidance; I fall a little outside those thoughts.

How many lugs do your wheels have? What is the psi/weight rating from the back of the wheel? You need to know those and then you know what the wheel can/can't handle.

If the trailer gvw is 13,900 I would definitely be running LRG...but that's me. At 3560 you have 14,600 load capacity vs 13,900 gvw leaving 700 lbs. "extra" capacity over gvw. Now general thought is that you deduct the pin/tongue weight from that to come up with a weight the tires are supposed to support...I don't agree with that, for me. I've seen my trailers in way too many situations, on way too many roads to think that the entire weight of that trailer doesn't fall on those tires more often that I would like. They do not always ride level, smooth and perfect.

I just talked to the manager of a tire store in TX this evening lining up new tires to put on our new 5th wheel. They will be Sailun LRG. For me, I still want the Endurance to gather a little more history - the Sailun has been a good/great tire and I'm entirely comfortable in getting it. They must be pretty popular; I want 235/80 16LRG and they have SIXTY THREE of them in stock in Lubbock TX alone so they must be fairly popular. JMO/YMMV

[CWtheMan]

Originally Posted by sourdough

If the trailer gvw is 13,900 I would definitely be running LRG...but that's me. At 3560 you have 14,600 load capacity vs 13,900 gvw leaving 700 lbs. "extra" capacity over gvw. Now general thought is that you deduct the pin/tongue weight from that to come up with a weight the tires are supposed to support...I don't agree with that, for me.

You know that I provide information that is in accordance with the regulations and standards developed by NHTSA and the tire industry for tire fitments to RV trailers.

Minimum mandatory tire selection for RV trailer tires is dictated by the vehicle certified GAWRs. In short, the regulation stipulates that “the sum of the maximum load ratings of the tires fitted to an axle shall be not less than the gross axle weight rating (GAWR) of the axle system as specified on the vehicle's certification label.”

Another entry in the regulation directs the vehicle manufacturer to select “the tire size designation and the recommended cold inflation pressure for those tires such that the sum of the load ratings of the tires on each axle is appropriate for the GAWRs”.

Remember, in the following, that established vehicle payload capacity is included in GVWR.

At the time of vehicle final certification, “the sum of the vehicle certified GAWR (s) added to the vehicle manufacturer’s recommended tongue weight must not be less than GVWR.”

For instance, the OPs trailer specs as I found them, list the dry weight as 11535#, with a payload capacity of 2445# which sets the GVWR at 13980#. The manufacturer set the tongue weight at 1980# leaving the remainder, 12000# to be carried by two 6000# GAWR axles.

FMVSS (standards) are minimum standards that comply with all vehicle safety standards at the time of certification. Thus, that certification label makes that vehicle unique from others of the model number and design.

Keys … designated size … vehicle certification … appropriate … There is no getting around their meanings.

[sourdough]

Thanks Cal - I know where you come from, understand it and appreciate it. As you know I have my own thoughts....for me.

[SAE]

you do NOT have to inflate this tire beyond the rating of your rims.



What you are buying is the safety and security in a ST duty tire that can not be matched, at any cost, by any other manufacturer in that size. Run these up to the limits of your rims and be happy!!

[CWtheMan]

Originally Posted by SAE

you do NOT have to inflate this tire beyond the rating of your rims.



What you are buying is the safety and security in a ST duty tire that can not be matched, at any cost, by any other manufacturer in that size. Run these up to the limits of your rims and be happy!!

This procedure is mentioned in the USTMA manual as being acceptable. However, the tire must conform to the wheel size specs and Sailun has always said their S637T tire's minimum rim width is 6.5".

http://gosailun.com/MRT/Tire/S637T

[ChuckS]

From Sailun Tires.....

In regard to your question about the wheel, the 6.5" wheel is the recommended width, however; both 6" and 7" are allowable wheel widths. You are all right with the 6". One thing to make sure of is the valve is brass, steel or aluminum. If it is rubber, you should get it changed.

Safe travels.

Al Eagleson ‘ACE’
Segment Manager, Commercial Tires
Off. (289) 499-3240 x202
Cel. (416) 315-9391

300-1 Kenview Blvd.,
Brampton, ON, L6T 5E6

Also Keystone Montana comes factory equipped with 6” wide wheels with Sailun tires....

There is no issue mounting Sailun tire on 6 inch wide rim...

https://www.trekwood.com/products/13...um-Blk-Y521100

[SAE]

Originally Posted by CWtheMan

This procedure is mentioned in the USTMA manual as being acceptable. However, the tire must conform to the wheel size specs and Sailun has always said their S637T tire's minimum rim width is 6.5".

http://gosailun.com/MRT/Tire/S637T

Of course! A wheel’s width is just as important as its diameter in matching it to a new set of sneakers.

[rs1718]

Run them at 95 psi. I did the same upgrade and found that 110 psi was too hard on the trailer . My toy hauler weighs 15k loaded kept stock wheels

[CWtheMan]

Originally Posted by rs1718

Run them at 95 psi. I did the same upgrade and found that 110 psi was too hard on the trailer . My toy hauler weighs 15k loaded kept stock wheels

I'm not intentionally stepping on your toes here. Sometimes when I see something just a little off I do a little researching.

According to the specs I found for your trailer model and year, it has vehicle certified 7000# GAWRs. If your current trailer tires are ST235/80R16 LRG they are nor providing the current industry recommended load capacity for your axles when set at 95 PSI. 100 PSI will kick them over the 10% load capacity reserves recommended by RVIA for those axles.

However, if you opted for the larger ST235/85R16 LRG tires, the 95 PSI is above the ballpark PSI figure.

In your year & model Keystone trailer they were providing OEM tires that should have had - these tires will fail soon - on their sidewalls no matter what brand they were.

[LHaven]

Originally Posted by flybouy

Your wheels should be stamped on the back with the max weight and psi.

Crawled under my trailer last week to get a photo of that, as part of the planning to replace the Trailer Kings. Learned that the backside of the wheels are perfectly obscured by the backside of the axle hubs. Auto mechanics are just not my wheelhouse.

Guess I'll have to wait until the guests leave and then pop a wheel off.