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110psi tire question...

garysol
Explorer
Explorer
Not to beat a dead horse but I am a little confused after reading many threads on the subject. I am running the Sailun S637 G rated tire with a max PSI of 110 which is what I have been running. I have read that many many people are running G rated tires at 100 or even 90PSI which lowers the tires max rating. I am confused as to why I would want to lower the inflation in the tire. Why would I not want want as much weight carrying as possible? What is the advantage to running a lower inflation?
2020 GMC Canyon
2022 NoBo 19.2
25 REPLIES 25

fj12ryder
Explorer III
Explorer III
Something else to think about is how stiff this Sailun tire is, and whether is the tread area is flexible enough to deform if full air pressure is used, but not full load is placed on it.

I've looked very closely at my Sailun tires when they are at full air pressure and the tread area is flat as a pancake, with no indication that there will be a problem with the center contacting the ground before the outer area. In fact at 110 psi in my Sailun S637 tires and a total weight of 12,500 lbs. on my triple axle toyhauler, that's 6 tires, the tires show absolutely no indication that they are doing anything other than tracking flat on the ground completely across the tread area.

Also, how many trailer haulers reset their air pressure when they're hauling an empty trailer? I would be willing to bet that no commercial trucks change their air pressure depending on how the trailer is loaded. Sailun S637 tires are labeled "For Trailer Use Only".

OTOH I run mine at 100 psi now because it takes forever to get them up to 110 psi from 100 psi. 🙂 I have a TPMS and watch them pretty closely.
Howard and Peggy

"Don't Panic"

JIMNLIN
Explorer
Explorer
garysol wrote:
Not to beat a dead horse but I am a little confused after reading many threads on the subject. I am running the Sailun S637 G rated tire with a max PSI of 110 which is what I have been running. I have read that many many people are running G rated tires at 100 or even 90PSI which lowers the tires max rating. I am confused as to why I would want to lower the inflation in the tire. Why would I not want want as much weight carrying as possible? What is the advantage to running a lower inflation?


Only on a RV website have I ever saw anyone use or recommend a minimum tire pressure charts for a tire on a trailer. In fact I never heard of the folly of derating a tire on a trailer till I came on this website.
Were not talking truck pressure requirements. Apples vs oranges.
Tires on a trailer operate in a much harsher environment than the same tires on a truck. DRop the pressure down to 90 psi and watch the tires sidewall/tread flex as it side scrubs around a corner. Now pump them to the max and repeat the process.

Now if you have pulled a rookie and are using those G load range tires on 5.2 or 6k axles then at some point 110 psi is too much pressure.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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FastEagle
Explorer
Explorer
garysol wrote:
Not to beat a dead horse but I am a little confused after reading many threads on the subject. I am running the Sailun S637 G rated tire with a max PSI of 110 which is what I have been running. I have read that many many people are running G rated tires at 100 or even 90PSI which lowers the tires max rating. I am confused as to why I would want to lower the inflation in the tire. Why would I not want want as much weight carrying as possible? What is the advantage to running a lower inflation?


Air pressure for your tires is much simpler than most will let it be. It's right on your tire information placard and in the vehicle owner's manual for OE tires. If you have plus sized your tires the industry standard is to use the amount of air pressure needed to get the same amount of load capacity that your OE tires provided.

FastEagle

motorcycle_jack
Explorer II
Explorer II
The reason for less pressure has to do with the wearing of the center of the tread if carrying more pressure than is needed. Almost all tire manufacturers publish a weight vs PSI chart. Have each tire weighed by a professional and then set the PSI accordingly - this will get you the most wear out of the tires for what they are carrying, their engineers have determined what PSI will keep the tread flat depending on weight load. Lots of tire engineers on here so PLEASE LISTEN to them 🙂 .
John
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SH
Explorer
Explorer
I am replacing the Power King G's for 614's on our new to us Alpenlite in the morning. They have a date code of 2007. The original owner ran the Power Kings at 90 PSI. The Power Kings look great except for the outside edges which are wearing faster...could this not be an indication of underinflated tires?
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Me_Again
Explorer II
Explorer II
Max sidewall inflation seems to be a band aid that the ST tire people came up with in an attempt to increase the life cycle of their product, with mixed results and far as I can tell.

I have talked to Michelin several times and they state over inflation leads to impact damage to the tire and decrease contact/braking performance.

Chris
2021 F150 2.7 Ecoboost - Summer Home 2017 Bighorn 3575el. Can Am Spyder RT-L Chrome, Kawasaki KRX1000. Retired and enjoying it! RIP DW 07-05-2021

Hondavalk
Explorer II
Explorer II
Dennis M M wrote:
Less chance of damage from road hazards with lower PSI and your trailer cares how hard it rides - things break and fall off faster.

If you set it to the proper pressure for the weight you also have the correct tire patch for the maximum amount of traction, i.e. less susceptible to cross winds.

X2. Tire mfg. have charts for specific PSI ratings for weight and tire combinations.

rhagfo
Explorer III
Explorer III
downtheroad wrote:
I'd run them at max pressure like you are doing.
The reasons for less (so I have heard) are:

> Less wear on the tire...maybe.
> Better ride...who cares, no one is riding in the trailer anyway.


If you need the full load capacity, run at full pressure.
If you are using about 90% or even as little as 80% of the carrying capacity, then lowering pressure gives the tire a BETTER contact patch on the road!! That could be VERY IMPORTANT during heaving braking!!
If a tire is overinflated for the load it is carrying it will have less contact with the road, same is true if under inflated, it is NOT one pressure fits all.
Russ & Paula the Beagle Belle.
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Dennis_M_M
Explorer
Explorer
Less chance of damage from road hazards with lower PSI and your trailer cares how hard it rides - things break and fall off faster.

If you set it to the proper pressure for the weight you also have the correct tire patch for the maximum amount of traction, i.e. less susceptible to cross winds.
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sdetweil
Explorer
Explorer
downtheroad wrote:
I'd run them at max pressure like you are doing.
The reasons for less (so I have heard) are:

> Less wear on the tire...maybe.
> Better ride...who cares, no one is riding in the trailer anyway.

I run at max as well. less pressure means more sidewall flex..
which causes heat.. heat is bad.. I'll pass
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2013 Keystone Alpine 3720FB

downtheroad
Explorer
Explorer
I'd run them at max pressure like you are doing.
The reasons for less (so I have heard) are:

> Less wear on the tire...maybe.
> Better ride...who cares, no one is riding in the trailer anyway.
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