New Sailuns installed, load chart ?

[Sportzfann]

New sailuns installed now have pressure questions
I have seen the load charts by Sailun for the 235/80/16. 14 ply tire
It looks like I could run less pressure based on the weight of my 303rls. Maybe 80psi ?
I scaled about 10,000 on the axles connected to the truck,give or take depending on the trip we are taking. These tires carry a max of 110 psi at max load which is way more than I carry so,
1. should I air up at less than max psi ?
2.And what would the minimum psi be ?
Tire guy says 110 psi……
I notice that some answers are all over the place, thanks

 

[traveldawg]

Here is an inflation chart.

I run mine at 110 lb, but I'm at 15k.

 

[Hoopy Frood]

I also run the Sailuns on my Momentum, but I'm carrying over 14,400 lbs. on the axles. I run mine at 110 psi.

On my last trailer, a triple axle Fuzion with about 12,000 lbs. on 3 axles, I ran the Sailuns at 90-95 psi. The ride seemed to be okay, and I never felt comfortable running the pressure any lower than 90 psi. Those tires still were on the trailer after 6 years, and still looked good. Nicely, evenly worn.

 

[Scott'n'Wendy]

I don't have 14 ply rated tires on our 303, but if I did I would not be inflating to max pressure. Wouldn't hurt them though if you did.
Here is a chart I found. Use as you see fit. Looks like 70psi is minimum from the chart.

https://fifthwheelst.com/documents/Copy%20of%20Load%20and%20Inflation%20All%20ST-Modified.pdf

 

[triplethreat]

The original tires on my Momentum were the Westlake "G" rated 14 ply tires and a 110 psi cold inflation number. Those tires (235/80/16) were rated at 4080 lbs when fully inflated to the 110 psi. I ran them about 4 years until a couple of them started weather cracking on the sidewalls and I replaced them with the Sailuns tires. I bought the 235/85/16 for replacement ("G" rated) and those tires have a load carrying capacity of 4400 lbs at the 110 psi cold inflation number. Remember, I'm running six tires on three axles, so that would have been a total of 26,400 lbs of load capacity if inflated to the 110 psi number. Looking at the Sailun inflation chart, 100 psi on those tires put me right back at the original number of 4080 lbs on each tire. That is what I now run in them.....and likely that is probably still a little too much. That 4080 per tire gives me 24,480 lbs of load capacity on the trailer tires and I'm normally in the 15,500 lb range for all three axles combined.

PS.....I went with the "85" series vs. the "80" series on the Sailun because at the time, the 85 series was a little over $100 LESS, per tire, than the 80 series.

 

[triplethreat]

I don't have 14 ply rated tires on our 303, but if I did I would not be inflating to max pressure. Wouldn't hurt them though if you did.
Here is a chart I found. Use as you see fit. Looks like 70psi is minimum from the chart.

https://fifthwheelst.com/documents/Copy%20of%20Load%20and%20Inflation%20All%20ST-Modified.pdf

That's the same Sailun chart I have downloaded to my computer....and I believe from the same source.

 

[Skilletface]

Sportzfann, always, when in doubt go with the manufacturers load chart for psi. information plus 10%-15% to account for fluctuations in temperature and altitude. This is just a baseline for your rig. The main purpose for making adjustments in psi. is to accommodate your rig and not someone else’s. and for the tire tread to strike the ground evenly. A common reply to questions like yours from those that follow this simple guide will be “Nicely, evenly worn”.

 

[Sportzfann]

Here is an inflation chart.

I run mine at 110 lb, but I'm at 15k.

At 80psi it shows I can carry 13,680 lbs. which is above my GVWR.

My trailer was running a little over 12,000 lbs which is max for my 303 rls. I did upgrade my springs to 3500lb. Mor ryde shackles, & 7000lb. axles.
I realize those upgrades don't Increase my GW capacity, but does give me some peace of mind from stock setup.
I guess I’m trying to find the sweet spot between beating my trailer up with max psi, and not under inflating my tires, and causing premature failure heat, abnormal wear etc.
The placard on my trailer shows a 80psi tire pressure but that is a OEM
E rated tire. Not sure I can safely run 80 psi with this tire.
I have a TPMS that reads temp and pressure, so I guess some experimenting is coming up. Maybe just start at 90 psi and adjust from there.
I’m hoping for nice and evenly worn!
I appreciate the comments thank you!

 

[Scott'n'Wendy]

Not sure I can safely run 80 psi with this tire.

It shows a load rating at 70psi so Sailun must be comfortable with them at that pressure?

 

[Hoopy Frood]

Maybe just start at 90 psi and adjust from there.

I think that's a wise decision. I ran mine at 90 psi on my previous trailer and they were only carrying about 2,500 lbs. each. I noticed no indications of an excessively rough ride.

 

[Hoopy Frood]

It shows a load rating at 70psi so Sailun must be comfortable with them at that pressure?

Sailun might be, but I sure wouldn't.

 

[Scott'n'Wendy]

Sailun might be, but I sure wouldn't.

Ya...but you are big and heavy.


The trailer I mean....

 

[Hoopy Frood]

Ya...but you are big and heavy.


The trailer I mean....

LOL, I was getting ready to be all insulted and such.

 

[traveldawg]

I tried running mine lower. I think it was around 95 PSI. I thought they wore a bit weird so I went back to 105 PSI. After all this discussion I checked again and I am running 105 PSI. I believe I am carrying around 12,500 on my axels. I really can't tell a rough ride from a smooth ride on the trailer end based on different tire pressures.

 

[Sportzfann]

I was planning on 90 psi and keeping an eye on the belongings inside the trailer as we travel as well as the tire temperatures.

We are headed to quartzite first week of December, so I will get a chance to see how they perform.

 

[Scott'n'Wendy]

I really can't tell a rough ride from a smooth ride on the trailer end based on different tire pressures.

Me neither. My trailer could be rolling on cast iron and I wouldn't be able to tell that the trailer has a rough ride.

 

[greische]

New sailuns installed now have pressure questions
I have seen the load charts by Sailun for the 235/80/16. 14 ply tire
It looks like I could run less pressure based on the weight of my 303rls. Maybe 80psi ?
I scaled about 10,000 on the axles connected to the truck,give or take depending on the trip we are taking. These tires carry a max of 110 psi at max load which is way more than I carry so,
1. should I air up at less than max psi ?
2.And what would the minimum psi be ?
Tire guy says 110 psi……
I notice that some answers are all over the place, thanks

I tried that exact same thing. I carry a heat gun to make sure my tires/bearings are not overheating. At 110psi, the tires ran about 90 degrees. Dropping them to 90 psi in the same trip raised the temperature to 125. Heat is the real enemy of tires. I run mine at 110 all the time

 

[ThomasB]

The original tires on my Momentum were the Westlake "G" rated 14 ply tires and a 110 psi cold inflation number. Those tires (235/80/16) were rated at 4080 lbs when fully inflated to the 110 psi. I ran them about 4 years until a couple of them started weather cracking on the sidewalls and I replaced them with the Sailuns tires. I bought the 235/85/16 for replacement ("G" rated) and those tires have a load carrying capacity of 4400 lbs at the 110 psi cold inflation number. Remember, I'm running six tires on three axles, so that would have been a total of 26,400 lbs of load capacity if inflated to the 110 psi number. Looking at the Sailun inflation chart, 100 psi on those tires put me right back at the original number of 4080 lbs on each tire. That is what I now run in them.....and likely that is probably still a little too much. That 4080 per tire gives me 24,480 lbs of load capacity on the trailer tires and I'm normally in the 15,500 lb range for all three axles combined.

PS.....I went with the "85" series vs. the "80" series on the Sailun because at the time, the 85 series was a little over $100 LESS, per tire, than the 80 series.

The 85 refers to tire size, 85 has taller sidewalls than the 80/

 

[gmitch]

I have a question. On your tow vehicle do you inflate your tires to the max that is printed on the sidewall? Why not? My tow vehicle tire sidewall says 50 psi max, BUT the truck manufacture says 32 psi. I would think the it is wise to follow the manufactures guidelines. I know to load my tow vehicle where it would need 50 psi would be well beyond what the vehicle is designed for.

I personally will follow the manufactures chart.

 

[jadatis]

Made you a cold pressure/ axleload- and tandemload-capacity- list, with build in maximum reserve, at wich nothing trembles loose.

For that I lowered the maxload by 4 steps, to give tire a deflection, needed for max speed 81 mph , instead of the 65 mph for wich the ST give maxload.

Then in front of cold psi, for seaching back heavyest axleload, and behind for the total tandem, then assumed adding 15% to the acurate determined by weighing tandemload.
For axleload using 90% of calculated axleload capacity, is same as adding first 11.1% to weighed axleload.

So build in maximum reserve, and still nothing trembling loose.

From your story, I make , you estimated the loads, and that is dangerous.

Assumed you have a traveltrailer or 5thwh,with tandemaxle, but correct me if wrong. If for tandemtotal, I took more reserve to cover also weightdifference between the axles.

ST235/80R16 G-load maxload single 4080 lbs AT 110 psi.

Axleload/cold psi/ tandemload
3154 lbs/ 50.0 psi/ 6091 lbs
3299 lbs/ 52.5 psi/ 6370 lbs
3443 lbs/ 55 0 psi/ 6649 lbs
3587 lbs/ 57.5 psi/ 6927 lbs
3730 lbs/ 60.0 psi/ 7204 lbs
3874 lbs/ 62.5 psi/ 7481 lbs
4017 lbs/ 65.0 psi/ 7757 lbs
4159 lbs/ 67.5 psi/ 8032 lbs
4302 lbs/ 70.0 psi/ 8307 lbs
4444 lbs/ 72.5 psi/ 8582 lbs
4586 lbs/ 75.0 psi/ 8856 lbs
4728 lbs/ 77.5 psi/ 9130 lbs
4869 lbs/ 80.0 psi/ 9403 lbs
5010 lbs/ 82.5 psi/ 9676 lbs
5151 lbs/ 85.0 psi/ 9948 lbs
5292 lbs/ 87.5 psi/ 10220 lbs
5433 lbs/ 90.0 psi/ 10492 lbs
5573 lbs/ 92.5 psi/ 10763 lbs
5714 lbs/ 95.0 psi/ 11034 lbs
5854 lbs/ 97.5 psi/ 11305 lbs
5994 lbs/ 100.0 psi/ 11575 lbs
6133 lbs/ 102.5 psi/ 11845 lbs
6273 lbs/ 105.0 psi/ 12114 lbs
6412 lbs/ 107.5 psi/ 12383 lbs

6552 lbs/110.0psi/ 12652 lbs/
referencepressure G-load

6691 lbs/ 112.5 psi/ 12921 lbs
6829 lbs/ 115.0 psi/ 13189 lbs
6968 lbs/ 117.5 psi/ 13457 lbs
7107 lbs/ 120.0 psi/ 13725 lbs

In Europe Continental groop often also give 10 psi higher max inflation pressure, wich can be compared with the only given maxcold on P-tires.

Then in the end it could give yust 110 psi, and nothing trembling loose, and acceptable grip.