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Old 07-17-2019, 01:06 PM   #1
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Tire Pressure for Upgraded Load Rating Tires

I can't seem to find an answer to this particular situation, so forgive me if the answer is buried in here somewhere I haven't looked.

I recently replaced my Acura ST205/75R14 Load Range C (max 50# pressure) trailer tires with Endurance ST205/75R14 Load Range D (max
65# pressure). The Acura's were doing fine with no failures, but exceeded five years old so; time to go.

These tires are installed on my Flagstaff 21FBRS travel trailer equipped with two 2200# axels. The manufactures recommended tire
pressure for all four tires is 50#; the max pressure for the original load range tires.

Should I inflate the new Endurance load range D tires to the max 65#, or to the original load range C tire recommended pressure of 50#?

I presented this same question to Goodyear and they dodged it by refering me to their load pressure chart. Using that chart for a 1100# load on each tire says 25#; not right.
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Old 07-17-2019, 01:09 PM   #2
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I did the same thing and I run mine between 60-65. If you run them too low they will heat up and may let go
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Old 07-17-2019, 01:15 PM   #3
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You really didn't need to go up to a load range D with your load. You had tons of margin with your load range C. 50 PSI will be fine. No need to go higher than that. They will not heat up anymore than your load range C did at 50.
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Old 07-17-2019, 01:23 PM   #4
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The more PSI use put in between 50 and 65 will increase your margin of safety. so it's your call . personally i would go higher but maybe not 65 more like 55 to 60
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Old 07-17-2019, 01:30 PM   #5
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Quote:
Originally Posted by danking49 View Post
These tires are installed on my Flagstaff 21FBRS travel trailer equipped with two 2200# axels.
Hard to believe they put 2200# axles on there since your dry weight is 4171# and you have 1521# of cargo weight according to the specs I read.


Have you weighed your trailer?
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Old 07-17-2019, 01:39 PM   #6
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Quote:
Originally Posted by danking49 View Post
I can't seem to find an answer to this particular situation, so forgive me if the answer is buried in here somewhere I haven't looked.

I recently replaced my Acura ST205/75R14 Load Range C (max 50# pressure) trailer tires with Endurance ST205/75R14 Load Range D (max
65# pressure). The Acura's were doing fine with no failures, but exceeded five years old so; time to go.

These tires are installed on my Flagstaff 21FBRS travel trailer equipped with two 2200# axels. The manufactures recommended tire
pressure for all four tires is 50#; the max pressure for the original load range tires.

Should I inflate the new Endurance load range D tires to the max 65#, or to the original load range C tire recommended pressure of 50#?

I presented this same question to Goodyear and they dodged it by refering me to their load pressure chart. Using that chart for a 1100# load on each tire says 25#; not right.
In 33 years of trailering I always run my tires at maximum showing on the sidewall. Touching wood on this....but in 33 years have never experienced a blowout.
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Old 07-17-2019, 02:18 PM   #7
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Tire designer / engineers will tell you that towable trailer tires should always be filled to max sidewall pressure.
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Old 07-17-2019, 02:33 PM   #8
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You really didn't need to go up to a load range D with your load. You had tons of margin with your load range C. 50 PSI will be fine. No need to go higher than that. They will not heat up anymore than your load range C did at 50.
If Goodyear offered trailer tires in load range C I would have gone that way; but they do not.
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Old 07-17-2019, 02:40 PM   #9
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Quote:
Originally Posted by babock View Post
Hard to believe they put 2200# axles on there since your dry weight is 4171# and you have 1521# of cargo weight according to the specs I read.


Have you weighed your trailer?
Mfr sticker on the trailer says 3750 gross, cargo capacity 1017 for a total of 4767. 500# on the tongue leaves 4300 or so on the axles; so no worries there.
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Old 07-17-2019, 03:41 PM   #10
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Cold tire max load pressure is on the tire sidewall. Never go over a sidewall pressure. Running under that tire pressure even if your previous tire called for 50# means you will be running way under inflated for that tire. It will shorten the tread life, increases rolling resistance which can increase temperature and pressure. You won't hurt anything by running the sidewall max pressure... but according to whose knowledge you go with under that may be negative in ways. You decide and roll on.
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Old 07-17-2019, 04:21 PM   #11
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This has been debated forever, all experts agree that ST tires need to be ran at max sidewall air pressure
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Old 07-17-2019, 04:41 PM   #12
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Quote:
Originally Posted by SailorSam20500 View Post
Tire designer / engineers will tell you that towable trailer tires should always be filled to max sidewall pressure.
Not true. Why do you think they have charts available?
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Old 07-17-2019, 04:42 PM   #13
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Originally Posted by Witch Doctor View Post
This has been debated forever, all experts agree that ST tires need to be ran at max sidewall air pressure
All internet experts maybe. ST tires do not always need to be inflated to the maximum pressure as listed on the sidewall.

Do a search for " ST tire pressure chart ".
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Old 07-17-2019, 04:55 PM   #14
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Maybe you should you should look up the 100’s of threads here on this forum. I wouldn’t call Tireman9 here on this forum who is an expert on tires (read his blogs) will say ST tires need to be ran at the sidewalk pressure. I’m only talking ST not anything else. Why don’t you take a look and get back to me. He’s way pass your internet expert. The OP bought ST tires.
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Old 07-17-2019, 05:09 PM   #15
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What the Doctor said:

ST tires should have no sidewall flex if you want to avoid blow outs. The only way to achieve no sidewall flex is to inflate them to the Maximum Cold Sidewall Pressure as indicated on the tire. In this case that's 65psi.

Flexing sidewalls builds temperature within the tire and will eventually delaminate the tire. There are absolutely no benefits in running less than maximum sidewall pressure.

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Old 07-17-2019, 05:49 PM   #16
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https://www.maxxis.com/trailer/trail...nflation-chart

Found the below notes on etrailer:
I can end this debate for you real fast! Trailer tires, which will have an ST in front of the size, should always be inflated to the maximum psi indicated on the tire. Trailer tires usually do not have a recommended and maximum psi indication so I am curious if the tries on the camper are ST tires or regular passenger vehicle tires. On a regular trailer tire you would inflate it to the max psi indicated on the tire because trailer tires are built with a thicker sidewall to handle more vertical load. helpful expert reply by: Michael H

How old is this information? Expert Micheal H says ST tires do not have a max psi on the tire. Really? So maybe this expert is not really an expert.

From Goodyear: Remember that tire pressure psi value printed on Goodyear Endurance tire sidewall is its maximum tire pressure that Goodyear Endurance tire can be inflated to at its corresponding maximum weight capacity, and not a recommended tire pressure setting for your vehicle.
Remember that tire pressure psi value printed on Goodyear Marathon Radial tire sidewall is its maximum tire pressure that Goodyear Marathon Radial tire can be inflated to at its corresponding maximum weight capacity, and not a recommended tire pressure setting for your vehicle.
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Old 07-17-2019, 06:03 PM   #17
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Check out this website from Tire Rack on tire pressure inflation at
https://www.tirerack.com/tires/tiret...jsp?techid=309

Note information especially on Special Tire (ST) Tire Maintenance
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Old 07-17-2019, 06:15 PM   #18
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Originally Posted by KEN9XL View Post
Check out this website from Tire Rack on tire pressure inflation at
https://www.tirerack.com/tires/tiret...jsp?techid=309

Note information especially on Special Tire (ST) Tire Maintenance
Nowhere does it say to always fill to maximum sidewall pressure. The Tire Rack info also appear to be old if you read the last section on Speed Ratings.
Carlisle Radial Trail HD are almost all rated at 81mph max.
https://www.carlislebrandtires.com/o...adial-trail-hd
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Old 07-17-2019, 08:30 PM   #19
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Quote:
Originally Posted by Witch Doctor View Post
This has been debated forever, all experts agree that ST tires need to be ran at max sidewall air pressure
If you run at max pressure, with considerably less than max weight, you probably won't have the maximum amount of tread on the road.
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Old 07-18-2019, 06:54 AM   #20
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Well, thanks for all the input. There seems to be two schools of thought here with little consensus. Run them at max pressure and give up traction and tread life (from running on the center); or run them at the original lower range C pressure and give up safety with excessive sidewall flex. With both Goodyear and Forest River getting back to me with non-answers (refer to the chart or sticker numbers), 60#s it is.
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