Sailun S637 on 3200lb Capacity Wheels

[On_theProwl]

I'm really wanting to do the Sailun S637 tire upgrade on our fiver when we take delivery, but I'm worried about the wheel capacity.

I've been told that I would be ok to run 95-100psi in these wheels with metal stems. Fiver is a '16 Jayco 326 BHQS with a gvwr of 14k.

Thoughts?

[rvexodus]

Folks, I know this is a really old thread and hate to stir up controversy as every thread on PSI load vs. max tends to get heated. However, I just reached out to Sailun for a tire inflation chart since the only ones I could find on the inter-webs were either for the wrong load rating or for the LT tires. The sailun rep provided me with the correct inflation chart and also recommended for my load situation to run around 85psi. Attached is the aforementioned sheet. Do with it as you please ... and don’t shoot the messenger :E

Sailun s637t inflation chart

[SoCalDesertRid1]

Upgrading to the larger diameter 17.5" wheels, also opens up the possibility of upgrading to larger diameter brakes.

[RustyJC]

otrfun wrote:

JIMNLIN wrote:

Using this line of thought, is it safe to assume a rim with a 4,000 lb. load rating can safely handle 110 PSI of pressure? Or, put another way, do they make an 80 PSI tire with a 4,000 lb. load rating?

I'm not saying there isn't but I've never seen a 16" trailer wheel that was 4000 lb rated.
Now the 17.5" trailer wheels can handle that much load and 110 psi which is a good upgrade for folks with a heavy wheel loads and 7k axles.

Thanks for the info. Wasn't aware a 4,000 lb. rating was that much of a stretch for a 16" wheel/rim. I've seen 16" 4,000 lb. wheel/rims used OEM on some toy haulers.

To minimize all compatibility and safety issues on a very heavy rig, especially toy haulers, 17.5" is probably the way to go. I'm guessing the larger diameter 17.5" tires/wheels have the potential to create some clearance issues on units that originally came with 16's though.

The 215/75R17.5 Goodyear G114 is actually shorter (30.5") than an LT235/85R16G Goodyear G614 RST (30.7", IIRC). The G114 is rated 4805 lbs @ 125 PSIG - when hot, pressures run ~145 PSIG, so the 17.5" wheels have to be capable of handling these pressures.

I upgraded our previous 2004 Mobile Suites 36RE3 from the 16" G614 RSTs to 17.5" Michelin XTAs and never had any issues with clearance or tire performance whatsoever. The current 2014.5 Mobile Suites 38RSSA came with 17.5" Goodyear G114s which have been fine so far.

Rusty

[otrfun]

JIMNLIN wrote:

Using this line of thought, is it safe to assume a rim with a 4,000 lb. load rating can safely handle 110 PSI of pressure? Or, put another way, do they make an 80 PSI tire with a 4,000 lb. load rating?

I'm not saying there isn't but I've never seen a 16" trailer wheel that was 4000 lb rated.
Now the 17.5" trailer wheels can handle that much load and 110 psi which is a good upgrade for folks with a heavy wheel loads and 7k axles.

Thanks for the info. Wasn't aware a 4,000 lb. rating was that much of a stretch for a 16" wheel/rim. I've seen 16" 4,000 lb. wheel/rims used OEM on some toy haulers.

To minimize all compatibility and safety issues on a very heavy rig, especially toy haulers, 17.5" is probably the way to go. I'm guessing the larger diameter 17.5" tires/wheels have the potential to create some clearance issues on units that originally came with 16's though.

[JIMNLIN]

Using this line of thought, is it safe to assume a rim with a 4,000 lb. load rating can safely handle 110 PSI of pressure? Or, put another way, do they make an 80 PSI tire with a 4,000 lb. load rating?

I'm not saying there isn't but I've never seen a 16" trailer wheel that was 4000 lb rated.
Now the 17.5" trailer wheels can handle that much load and 110 psi which is a good upgrade for folks with a heavy wheel loads and 7k axles.

[On_theProwl]

Against my better judgement, I went the easy route and upgraded with Maxxis. I really wanted to go with the Sailun, but didn't feel comfortable with all the opinions going back and forth. I like Maxxis and think they make a great tire. I was mainly wanting to upgrade to the G rated for those times that you need to exceed 65mph. I hate being regulated to 65mph with an ST tire.

[otrfun]

JIMNLIN wrote:

bpounds wrote:

On theProwl wrote:
I confirmed with local tire dealer today. He says that it is no problem running 110psi in that wheel with those tires. He states that overloading the wheel weight rating is what will cause wheel failure. I've dealt with him for years and he knows his stuff. I'm not saying he's right or wrong, but i do value his opinion and feel it trustworthy.

I also know between this forum and the Jayco forum that several are running the same setup on the same wheels.

This is the correct answer. Wheels are designed for a load limit, not a pressure limit.

But all the "experts" around here won't agree.

Even real experts like a wheel manufacturer/axle manufacturer/tire manufactuers/rvtiresafety.com and many other sources disagree with that statement.

This from Dexstar wheel/Dexter axle
WHEELS & TIRES - What tires can I use on these wheels?
Wheels and tires must be matched. The wheel will have a label stating its rim diameter, width and contour. The tire selected must be approved by the Tire and Rim Association for use on that particular size wheel. The tire capacity selected should not exceed the capacity rating of the wheel. The tire inflation pressure must not exceed the pressure rating of the wheel. WARNING - The use of tires that are not approved for use on a wheel could result in explosive separation of the tire and wheel and could cause a serious accident.


Load a 16" 3100-3200 lb rated wheel to 3200 lbs and then add 110 psi can and has resulted in a split bead or a cracked valley. BTDT more than once..... and saw lots of examples of using pressures above the wheels max psi ability when I was on the road.
Lots of 16" trailer and truck wheels out here with 3200-3600 lb load rating and a 80 psi max rating.

Don't over pressure a tire or wheel. Sooner or later it will bite you in the butz.

Using this line of thought, is it safe to assume a rim with a 4,000 lb. load rating can safely handle 110 PSI of pressure? Or, put another way, do they make an 80 PSI tire with a 4,000 lb. load rating?

[NC_Hauler]

JIMNLIN wrote:

bpounds wrote:

On theProwl wrote:
I confirmed with local tire dealer today. He says that it is no problem running 110psi in that wheel with those tires. He states that overloading the wheel weight rating is what will cause wheel failure. I've dealt with him for years and he knows his stuff. I'm not saying he's right or wrong, but i do value his opinion and feel it trustworthy.

I also know between this forum and the Jayco forum that several are running the same setup on the same wheels.

This is the correct answer. Wheels are designed for a load limit, not a pressure limit.

But all the "experts" around here won't agree.

Even real experts like a wheel manufacturer/axle manufacturer/tire manufactuers/rvtiresafety.com and many other sources disagree with that statement.

This from Dexstar wheel/Dexter axle
WHEELS & TIRES - What tires can I use on these wheels?
Wheels and tires must be matched. The wheel will have a label stating its rim diameter, width and contour. The tire selected must be approved by the Tire and Rim Association for use on that particular size wheel. The tire capacity selected should not exceed the capacity rating of the wheel. The tire inflation pressure must not exceed the pressure rating of the wheel. WARNING - The use of tires that are not approved for use on a wheel could result in explosive separation of the tire and wheel and could cause a serious accident.


Load a 16" 3100-3200 lb rated wheel to 3200 lbs and then add 110 psi can and has resulted in a split bead or a cracked valley. BTDT more than once..... and saw lots of examples of using pressures above the wheels max psi ability when I was on the road.
Lots of 16" trailer and truck wheels out here with 3200-3600 lb load rating and a 80 psi max rating.

Don't over pressure a tire or wheel. Sooner or later it will bite you in the butz.

Agree..That's what I was trying to say..

Thx,
Jim

[JIMNLIN]

bpounds wrote:

On theProwl wrote:
I confirmed with local tire dealer today. He says that it is no problem running 110psi in that wheel with those tires. He states that overloading the wheel weight rating is what will cause wheel failure. I've dealt with him for years and he knows his stuff. I'm not saying he's right or wrong, but i do value his opinion and feel it trustworthy.

I also know between this forum and the Jayco forum that several are running the same setup on the same wheels.

This is the correct answer. Wheels are designed for a load limit, not a pressure limit.

But all the "experts" around here won't agree.

Even real experts like a wheel manufacturer/axle manufacturer/tire manufactuers/rvtiresafety.com and many other sources disagree with that statement.

This from Dexstar wheel/Dexter axle
WHEELS & TIRES - What tires can I use on these wheels?
Wheels and tires must be matched. The wheel will have a label stating its rim diameter, width and contour. The tire selected must be approved by the Tire and Rim Association for use on that particular size wheel. The tire capacity selected should not exceed the capacity rating of the wheel. The tire inflation pressure must not exceed the pressure rating of the wheel. WARNING - The use of tires that are not approved for use on a wheel could result in explosive separation of the tire and wheel and could cause a serious accident.


Load a 16" 3100-3200 lb rated wheel to 3200 lbs and then add 110 psi can and has resulted in a split bead or a cracked valley. BTDT more than once..... and saw lots of examples of using pressures above the wheels max psi ability when I was on the road.
Lots of 16" trailer and truck wheels out here with 3200-3600 lb load rating and a 80 psi max rating.

Don't over pressure a tire or wheel. Sooner or later it will bite you in the butz.

[bpounds]

NC Hauler wrote:
IF wheel is stamped for load rating of 3200#, it CAN equate to what tire one can use. Example.: An E rated Michelin XPS RIB has a weight rating of 3020 pounds at 80 psi...OP's wheel is rated 180# more than that, all is good....If you go to a G rated GY G614, rated at 3750# @ 110 psi, which is over wheels rating by 550#...wheel won't take 110 psi..so wheel rating can be looked at both ways..
in know you can run lower psi in tire's, but one has to also take into wear on tires and when turning unit around and "skewing" tires in tight turn.

Nah, we'll have to just disagree.

That LR-G will carry 3020# @ 80psi just as well as the LR-E will carry 3020# @ 80psi. (better safety margin actually) It won't sag any more, won't heat up any more. Load charts, if you can find them, prove it. There might be 5psi difference due to the stiffer construction. Personally I would go on up to 100psi, but would NEVER exceed the 3200# wheel rating, or the original trailer GVWR.

[NC_Hauler]

IF wheel is stamped for load rating of 3200#, it CAN equate to what tire one can use. Example.: An E rated Michelin XPS RIB has a weight rating of 3020 pounds at 80 psi...OP's wheel is rated 180# more than that, all is good....If you go to a G rated GY G614, rated at 3750# @ 110 psi, which is over wheels rating by 550#...wheel won't take 110 psi..so wheel rating can be looked at both ways..
in know you can run lower psi in tire's, but one has to also take into wear on tires and when turning unit around and "skewing" tires in tight turn.

[bpounds]

On theProwl wrote:
I confirmed with local tire dealer today. He says that it is no problem running 110psi in that wheel with those tires. He states that overloading the wheel weight rating is what will cause wheel failure. I've dealt with him for years and he knows his stuff. I'm not saying he's right or wrong, but i do value his opinion and feel it trustworthy.

I also know between this forum and the Jayco forum that several are running the same setup on the same wheels.

This is the correct answer. Wheels are designed for a load limit, not a pressure limit.

But all the "experts" around here won't agree.

[On_theProwl]

dcg9381 wrote:
You need to determine the PSI rating of your wheels. You also need to determine the psi rating of your valves.

Often the psi rating is stamped into the inside of the wheel.

Don't run more than the rated PSI on the wheel. IF you have 85 psi rated wheels, run your S637s at 85psi. They can operate at lower psi ratings, but obviously you get decreased load capacity. Still, it's likely a much better tire than what you had from the factory.

Wheels, tires, and valve stems all need to be rated for the PSI you put in them.

Wheels are not stamped with psi rating, only weight rating of 3200#. I planned on definitely replacing valve stems with high pressure metal stems, and only planned to run 95psi, as that would be enough to cover weight rating I need.

[dcg9381]

You need to determine the PSI rating of your wheels. You also need to determine the psi rating of your valves.

Often the psi rating is stamped into the inside of the wheel.

Don't run more than the rated PSI on the wheel. IF you have 85 psi rated wheels, run your S637s at 85psi. They can operate at lower psi ratings, but obviously you get decreased load capacity. Still, it's likely a much better tire than what you had from the factory.

Wheels, tires, and valve stems all need to be rated for the PSI you put in them.