is anyone running the Sailun 637ST tires on their rigs. I have been told that I can run them on my rims but to only put 90 psi of air in them as the factory alloy rim can only handle up to 100 psi. So, I was just wondering if anyone is doing this and if they have had any issues?
It would greatly help for your post and future to add your RV info to your signature block..
Yes.. I am on my second season with Sailun ST 235/85x16 tires.. I run 105 psi in them based on my choice...
You first need to VERIFY what the psi rating stamped on the backside of your RV wheels shows...
At 90 psi the "Full Load" capacity of the tire will not be achieved... If the rim is stamped 100 psi then you can air to 100 psi cold if desired..
Link to Sailun load inflation chart.. this will show the various load capacities at various cold psi inflation pressures... in 5 psi increments all the way to 110 psi..
I run em on my current 5ver at 110psi due to the weight. On my previous 5er I ran em at 85psi after talking with a Saliun Tech. Took the previous 5ver from Florida to Montana and back twice, tires never skipped a beat and still looked like new tread wise when I traded it.
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Rick
2021 Alpine 3790FK
2021 Ford SD F350 6.7 PS 4x4 Crew Cab LB Dually
I run Sailun 235/80r16 LRG 14ply. This is their 3rd season and they're going great. Nothing to say but good. Refer to the inflation chart ChuckS linked and make sure that the inflation/weight listed for 90psi (and the wheel) will support the required weight plus at least a 10% safety cushion.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
Same as above^^^^. We ran Sailun on the Raptor for three years after the damage from everyone’s favorite ‘Blowmax’ damage. They still looked new when the RV sold.
is anyone running the Sailun 637ST tires on their rigs. I have been told that I can run them on my rims but to only put 90 psi of air in them as the factory alloy rim can only handle up to 100 psi. So, I was just wondering if anyone is doing this and if they have had any issues?
Steve
I run the Sailun 637 and no issues. Second season and still look new. I run at about 108 psi. My rims are rated for 110. I would double check your rating stamped on the back of your rim. It is probably rated for 110, but double check. Running them “hard” or close to full inflation increases mileage as they roll with less friction, and run cooler as there is less side wall flex. I never have to wonder about if the inflation is right for the load (lower). At full inflation I am always good to go and don't have to check any load chart. With a full load my tires are still good as far as weight rating (G). I do check inflation often and use a TPMS system. You should be fine. I’m
The Sailuns came on my toy hauler and seemed to wear prematurely on the outer ribs. I put a second set on and they did the same. I now have some Carlisle CSL16 235/80R-16 which spec’d out a little better. Only about a 1k miles on them so the jury is still out if it was the tire being the wear issue or something else.
Recomend you verify your rim rating rather than go by what you have been told they may be rated for. Should cast in one of the spokes. Weight and psi.
2017 MHC 353RL trailer I REPLACED my 5 year old S637 ST235/80-R16 tires this April 2023 over 35k miles on this set, yes outer tread worn both in and outboard on all 4 worn the same. (Now ST235/85-R16) Have Disc brakes gain set at 6 but still will skid occasionally hard braking.
Have been running air pressure cold at 90 to 100 but normally at 95 not changing with new set. Refer to Tire Load Pressure Chart. No I'm not carrying the weight as rated but these G rated tires give you a safe tire rated higher than you need.
Tow SAFE.
The Sailuns came on my toy hauler and seemed to wear prematurely on the outer ribs. I put a second set on and they did the same. I now have some Carlisle CSL16 235/80R-16 which spec’d out a little better. Only about a 1k miles on them so the jury is still out if it was the tire being the wear issue or something else.
that's usually an axel alignment issue and is quite common on rv's as they set them up "close"
We had Sailun 637's on our 371 Fuzion and they were great tires. Kept the psi at 105 to 110 and never had a problem. Bought the camper in November 2014 and never heard of a Sailun tire.
__________________ 2021 Ford Expedition FX4 with max towing. 33" BFG KO2's 4 point Equalizer hitch.
2022 Cougar 25RDS
The Sailuns came on my toy hauler and seemed to wear prematurely on the outer ribs. I put a second set on and they did the same. I now have some Carlisle CSL16 235/80R-16 which spec’d out a little better. Only about a 1k miles on them so the jury is still out if it was the tire being the wear issue or something else.
We originally upgraded to the Goodyear G614 tires, and a couple years ago now have the Sailun S637, and they both get some wear on the shoulders. It's thought that due to the stiffness of the tire, when turning, the shoulders scrub which causes that wear. It never seems to be a problem and the tires last a long time.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
is anyone running the Sailun 637ST tires on their rigs. I have been told that I can run them on my rims but to only put 90 psi of air in them as the factory alloy rim can only handle up to 100 psi. So, I was just wondering if anyone is doing this and if they have had any issues?
Steve
Well based on the fact that your 5th wheel has a GVWR of 12,440# I would say 90 is just fine.
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360 Visit and enjoy Oregon State Parks
Well based on the fact that your 5th wheel has a GVWR of 12,440# I would say 90 is just fine.
ya I looked at that, the only benefit to running higher would be less rolling resistance, I am just trying to figure out how much difference that would make in real world numbers from sailun right now.
ya I looked at that, the only benefit to running higher would be less rolling resistance, I am just trying to figure out how much difference that would make in real world numbers from sailun right now.
The trade off to less rolling resistance, is less tire traction, both wet and dry.
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360 Visit and enjoy Oregon State Parks
The trade off to less rolling resistance, is less tire traction, both wet and dry.
ya, I don't tow like an animal so that small amount wouldn't make a difference to me as the traction ratings are at full operating pressure. so I'm not making them worse running 110 psi
The Sailuns came on my toy hauler and seemed to wear prematurely on the outer ribs. I put a second set on and they did the same. I now have some Carlisle CSL16 235/80R-16 which spec’d out a little better. Only about a 1k miles on them so the jury is still out if it was the tire being the wear issue or something else.
Need an alignment.
My last 5er wore the tires the same, the alignment cured the issue. At the time it cost $125 per axle for the alignment which was barely more than the price of 1 tire, $$ well spent.
As for the Sailun tires, they were amongst the best trailer tires I've ever bought. I upgraded to the 17.5" H rated inflated to 125 psi, the max cold pressures imprinted on the sidewalls so I never worried about loads or charts.
Honestly never had any concern or an issue with traction control with any trailer tires, they've seemed to always roll along on the trailer right behind the truck.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
ya, I don't tow like an animal so that small amount wouldn't make a difference to me as the traction ratings are at full operating pressure. so I'm not making them worse running 110 psi
Yes, at full operating pressure, AT full operational load of 4,400# per tire. At 110 psi the four tires will support 17,600#. That is 5,168# more than the 12,440# GVWR of your 5th wheel. Now one more step, figure lite pin of 20% that would be 2,488#, 12,440 - 2,488 = 9,952#, so now the tire are inflated to support 7,648# more than they are carrying.
If inflated to 65 psi, each tire will support 3,200# or a total of 12,800# or 360# more than the total weight of your 5th wheel at full GVWR.
Just because the sidewall states Maximum 110 psi, doesn’t mean that is the best pressure for all loads, that is why the inflation charts exist!
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Russ & Paula and Belle the Beagle.
2016 Ram Laramie 3500 DRW 14,000# GVWR (New TV)
2005 Copper Canyon 293 FWSLS 32’ GVWR 12,360 Visit and enjoy Oregon State Parks
Yes, at full operating pressure, AT full operational load of 4,400# per tire. At 110 psi the four tires will support 17,600#. That is 5,168# more than the 12,440# GVWR of your 5th wheel. Now one more step, figure lite pin of 20% that would be 2,488#, 12,440 - 2,488 = 9,952#, so now the tire are inflated to support 7,648# more than they are carrying.
If inflated to 65 psi, each tire will support 3,200# or a total of 12,800# or 360# more than the total weight of your 5th wheel at full GVWR.
Just because the sidewall states Maximum 110 psi, doesn’t mean that is the best pressure for all loads, that is why the inflation charts exist!
yup but there is also a minimum the tires should be run at that isn't stated in the load chart. for example, my sailun terramax at's I run on my truck the sailun engineers said to never run them under 45psi and even keep them above 55 to be safe as they will get irregular and accelerated tread wear.
the factory tires for my truck came inflated to 80psi, their max. If you go by the chart, I could run them at 40 psi so they were way over inflated for the weight. They still wore evenly and lasted a decent amount of time (for a tow rig but not nears as good as the sailun tires I run now) my old rv tires over the year have always been run at max pressure which is more than the weight of the rv. even the current ones have a 30% cushion for the weight when inflated to max. so, through trial and error I have never found anything bad about running max pressure aside from the little harsher of a ride.
inflation charts, in my opinion,, should be a guide to ensure you have at least that amount if for some reason you don't want to run max. The tire should not bulge and burn out the center unless it is over inflated above the max, but being under the presure listed on the chart will give you wear patterns.
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2021 Ford Expedition FX4 with max towing. 33" BFG KO2's 4 point Equalizer hitch. 
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