G rated (S637) Sailun Tires Thread

[Titan Guy]

All tires have an optimum rim width. In the LT235/85R16 that is 6.5".

Tire & Rim Association list approved widths of 6.0", 6.5", & 7.0".

[On The Road Again]

I grew tired of the uncertainty of the Trailer King tires, even though they had only about 4000 miles on them, and ordered a set of Sailun ST235 80R16. Dropped it off Tuesday morning for the swap out. Came back by about lunch time and this is what the shop wanted to show me. I am diligent about my tire maintenance including checking pressure, temp, watching my speed and visual inspections at stops. I also have the TST 507 TPMS. This bubble was on the inside and I failed to catch it and had just come home from a short trip. Let this serve as your official warning to get rid of those "china bombs."

[dcg9381]

Claim that sucker, see if you can at least get some money for it. I'd press for "all" tires, actually.

Also file a complaint. Trailer King seem to be a rebrand of another tire with a crappy reputation. Help get these on record as bombs that consumers should be wary of:

https://www-odi.nhtsa.dot.gov/ivoq/Complaint.cfm

[roadglide]

I kicked around st or LT tires . I just got the 235/85/16 sailun installed today they set my toy hauler up higher then expected but there is 3 inches all the way around the wheel wells and tires , going from a 280 to a 285 I was a little concerned with spacing no problem there. The trailer Kings did there 1 year worth of traveling , I was never comfortable with the softer tire from trailer king.

[dcg9381]

3" of clearance prior to the new tires would give 2.5" or so - that's too tight for my comfort level on the deck - looking at a 1" lift to get it back to where it was.

In hindsight, I should have gone to 235/80-16s.. Which Sailun also makes - I just couldn't find them at the time.

[CWtheMan]

Originally Posted by Titan Guy

All tires have an optimum rim width. In the LT235/85R16 that is 6.5".

Tire & Rim Association list approved widths of 6.0", 6.5", & 7.0".

Do you have a TRA manual? If so, look at that size with the steel casing design. It's 6.5".

Although not required, some manufacturers put the 6.5" rim requirement right on the steel cased tire's sidewall.

http://www.irv2.com/photopost/showfull.php?photo=29709

[roadglide]

That was just eye ball guess. I went out with a yard stick and there is 4 inches after the 285 installed. To close for comfort is rubbing tires or wheel well, the tires cant go any where unless they fly apart or rubbing. On my duramax there isn't a inch from the front tires and wheel well. One more thing the 280 tire is just a odd ball size they through on these heaver toy haulers.

[Koladog]

Just got a set of Sailun S637 ST235/80R16 installed on my Mountaineer. They are more than enough tire for this trailer (11,000 lbs dry). The tire guys pumped them up to 80 lbs as stated on the placard. Just wondering if I should leave them there, pump to max 110 lbs, or somewhere inbetween???

[gearhead]

Originally Posted by Koladog

Just got a set of Sailun S637 ST235/80R16 installed on my Mountaineer. They are more than enough tire for this trailer (11,000 lbs dry). The tire guys pumped them up to 80 lbs as stated on the placard. Just wondering if I should leave them there, pump to max 110 lbs, or somewhere inbetween???

Look on the back of the wheel and see what it is rated for...either weight or pressure. If what has been posted here is correct, Sailun can be run at less than max air pressure, dependent on the load on the tire.
Don't just air up the tire over 80psi not knowing what the wheel is rated for.
Do a search on here for Sailun and find the post with the email from Sailun regarding running less than max air.
From memory, and please don't take this to the bank, I think Sailun says you are OK to run the tires at 80psi if loaded no more than 3,000 pounds per tire.
You should weigh your 5th all loaded and "ready to go".

[Koladog]

My wheels are rated for 110PSI. On our last trip our fully loaded trailer weighed in at about 12,800 lbs (just trailer).

[CWtheMan]

Originally Posted by Koladog

Just got a set of Sailun S637 ST235/80R16 installed on my Mountaineer. They are more than enough tire for this trailer (11,000 lbs dry). The tire guys pumped them up to 80 lbs as stated on the placard. Just wondering if I should leave them there, pump to max 110 lbs, or somewhere inbetween???

If your tire placard says 80 psi you already had ST235/80R16E tires. The Sailun LRG is also a ST235/80R16 and at 80 psi will provide the same load capacity as the OE tires. They will be a little more durable but not stronger when inflated to 80 psi. To gain much needed load capacity reserves from your new tires you should establish a new recommended inflation pressure for them.

[Titan Guy]

I have sold 100's of Sailun Tires and have yet to see a single complaint.
On most trailers you want max air pressure that the tire & wheel will handle. Reason is you want reserve load capacity of 20%+ on your trailer tires, just like you have on your pickup, passenger and SUV tires.
A load range G with a 3,750 load capacity would have 20% reserve capacity with a tire load of 3,000 lbs.

[CWtheMan]

Trailer tire inflation pressures are an often pondered subject in RV trailer forums. Often times getting overheated. The discussions roam from wants to needs or what is correct as opposed to what is thought to be correct.

During the trailer’s certification process NHTSA via FMVSS directs the trailer manufacturer to set the recommended cold tire inflation pressures. Those pressures are the correct pressures and are the standard from which all subsequent replacement tires will get their inflation pressures from. Industry standards do not say you cant use more than what is recommended if you have some to use and the rims have the necessary load capacity and increased pressure values to sustain higher than recommended inflation pressures. However, Industry standards will not recommend any pressures lower than what has been recommended by the vehicle manufacturer for Original Equipment (OE) tires.

Even though the same regulation (standard) is used for tire inflation on motorized vehicles and RV trailers there are differences. Motorized vehicles must have reserve load capacities via inflation. TV trailer tires do not.

The simplest way to say this is as follows: Replacement tires must be capable of providing an equal or greater load capacity (via inflation) than the OE tires. This is normally where the confusion sets in when using replacement tires of another size or design and size. What to inflate them to. The tire placard gives the answer. Remember, you must equal the load capacity of the OE tires. So you use an inflation pressure that does just that, or more, for greater reserve load capacity as long as the rims are qualified for the tire fitment.

Auxiliary tire placards are authorized for the plus sized tires. You just make one up showing the new tire size and recommended inflation pressure and place it next to the original placard. Then go and make notations in the owner’s manual.

There is no official figure for tire reserve load capacities for RV trailer tires. The RMA has always recommended 12-15% but has never been able to get the rules makers to make it official. Whenever an owner wants an extra 15% load capacity reserve it's normally going to cost more than expected because new rims will also be needed. Even if the industry starts doing it there will have to be a phase-in because of the trailer design elements that will have to be changed.