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Old 04-04-2019, 01:17 PM   #1
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Tire pressure

Just bought a new ( to me) 2015 Spree Connect 322 UVW is supposed to be 7440 length overall 32.5 ft, towing with 2016 GMC 2500 6l gasser 4.10 rear. should be lots of truck questions is trailer says 65 psi for st 225/75/d range tires, Im running Goodyear endurance 225/75e's that call for max 90 psi on sidewall so.... Run 65.? 90? Or somewhere in between?
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Old 04-04-2019, 01:34 PM   #2
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Tire pressure

Check Goodyear’s inflation chart for the Endurance tires and the expected weight per tire. The chart provides the minimum pressure needed for that load at the rated tire speed. Anything between that and sidewall pressure, which is not the max pressure but the pressure needed for max load, is fine as long as it doesn’t exceed the pressure rating of the wheel.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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Old 04-04-2019, 01:45 PM   #3
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I just got Endurance tires. They say 80psi in big letters right on the sidewall. That's what I use.
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Old 04-04-2019, 02:05 PM   #4
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Originally Posted by mulher View Post
Just bought a new ( to me) 2015 Spree Connect 322 UVW is supposed to be 7440 length overall 32.5 ft, towing with 2016 GMC 2500 6l gasser 4.10 rear. should be lots of truck questions is trailer says 65 psi for st 225/75/d range tires, Im running Goodyear endurance 225/75e's that call for max 90 psi on sidewall so.... Run 65.? 90? Or somewhere in between?
Are you positive that's not a typo and you meant to type 80 psi. As has been noted, 80 psi is normally the max pressure for that size tire and Load Range.

Goodyear even states such on their website for that tire:

https://www.goodyear.com/en-US/tires...ce/sizes-specs

  • Tire SizeST225/75R15
  • Product Code724857519
  • Speed RatingN
  • Load Index117
  • Load RangeE
  • SidewallBlack
  • Uniform Tire Quality Grade (UTQG)
  • Max Load (lbs)2,830
  • Max Inflation Pressure (PSI)80
  • Approved Rim Width (in.)6.0 - 7.0
  • Measured Rim Width (in.)6.0
  • Section Width (in.)8.8
  • Tread Depth (in 32nds)8
  • Outside Diameter (in.)28.3
  • Revs Per Mile0
  • Price$130.00





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Old 04-04-2019, 02:36 PM   #5
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Yup sry my bad it is 80 psi still not sure whether to air up to that? Trailer will probably go 8-8.5k loaded.
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Old 04-04-2019, 02:42 PM   #6
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Originally Posted by mulher View Post
Yup sry my bad it is 80 psi still not sure whether to air up to that? Trailer will probably go 8-8.5k loaded.


Look at the load/inflation chart I linked in the first reply.

Don’t exceed the rated PSI of the wheel, either.
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Old 04-04-2019, 05:30 PM   #7
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Originally Posted by DieselDrax View Post
Check Goodyear’s inflation chart for the Endurance tires and the expected weight per tire. The chart provides the minimum pressure needed for that load at the rated tire speed. Anything between that and sidewall pressure, which is not the max pressure but the pressure needed for max load, is fine as long as it doesn’t exceed the pressure rating of the wheel.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
What DieselDrax said!

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Originally Posted by timfromma View Post
I just got Endurance tires. They say 80psi in big letters right on the sidewall. That's what I use.
That's the max cold PSI the tire is rated for, not necessarily what you're supposed to air up to.
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Old 04-05-2019, 04:13 PM   #8
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Thanks I'll try them at65 and see how they feel first.
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Old 04-05-2019, 04:38 PM   #9
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Thanks I'll try them at65 and see how they feel first.
For your TT forget the 65 psi if there cold max 80 run 80 psi . you can try 65 and they may just get you over heated tires and a blow out . you need the stiffer side walls that the 80 will give you 32' 8500 lbs will put a lot of force on those tires why risk it
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Old 04-06-2019, 11:02 AM   #10
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Originally Posted by MR.M View Post
For your TT forget the 65 psi if there cold max 80 run 80 psi . you can try 65 and they may just get you over heated tires and a blow out . you need the stiffer side walls that the 80 will give you 32' 8500 lbs will put a lot of force on those tires why risk it

Did you miss the fact that the OP upgraded the tires from D to E rated? The original 225/75/15 LRD tires were fine for the 8,300LB GVWR of their trailer or roughly 1867LB per tire with 10% on the tongue. With the new tires at 65PSI they are rated for 2,540LB per tire at the rated speed of 87MPH. That means at 65PSI cold they are capable of handling just over 10,000LB on the axles, well over the trailer's GVWR.


They don't NEED to run them at 80PSI because they didn't NEED LRE tires. Running them at 80PSI will make them much firmer than the LRDs at 65PSI and end up really pounding the trailer because there's not enough weight.


The OP will be MORE than fine running their Endurance tires at 65PSI for their trailer. The sidewall PSI is needed for MAX load, not for ALL loads.
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Old 04-06-2019, 01:52 PM   #11
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Originally Posted by DieselDrax View Post
Did you miss the fact that the OP upgraded the tires from D to E rated? The original 225/75/15 LRD tires were fine for the 8,300LB GVWR of their trailer or roughly 1867LB per tire with 10% on the tongue. With the new tires at 65PSI they are rated for 2,540LB per tire at the rated speed of 87MPH. That means at 65PSI cold they are capable of handling just over 10,000LB on the axles, well over the trailer's GVWR.


They don't NEED to run them at 80PSI because they didn't NEED LRE tires. Running them at 80PSI will make them much firmer than the LRDs at 65PSI and end up really pounding the trailer because there's not enough weight.


The OP will be MORE than fine running their Endurance tires at 65PSI for their trailer. The sidewall PSI is needed for MAX load, not for ALL loads.

NOPE . IMO plenty of weight for the E maxed at 80 psi . he should have staid with D tires if he's not taking advantage of the E tires . Running them at 65 will IMO cause more issues then inflating to 80 psi .I run a loaded Th at 9300 way below the max weight of E rated tires and i do so at 80 psi and it's doesn't pound my trailer . he want's to run them at 65 it's his unit i GAVE my opinion and don't care what you think, Enough said .
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Old 04-06-2019, 01:57 PM   #12
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He should just run them at what the inflation chart says. If he ran 65 with the Ds he should run 65 with the Es. They won't run hotter than what the Ds would with the same load. Follow the manufacturers recommendation. That's why they put out the chart.
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Old 04-06-2019, 03:53 PM   #13
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Originally Posted by MR.M View Post
NOPE . IMO plenty of weight for the E maxed at 80 psi . he should have staid with D tires if he's not taking advantage of the E tires . Running them at 65 will IMO cause more issues then inflating to 80 psi .I run a loaded Th at 9300 way below the max weight of E rated tires and i do so at 80 psi and it's doesn't pound my trailer . he want's to run them at 65 it's his unit i GAVE my opinion and don't care what you think, Enough said .

Do you have LRE tires on your truck? If so, do you run them at sidewall PSI even when empty?


Do you run all your tires on all your vehicles at the sidewall PSI or do you follow the mfr recommended pressures for empty/light load and increase the pressure when loaded?


You don't have to run LRE tires at max load PSI to "take advantage" of them and running them at the PSI listed in the load/inflation chart. Even running the LRE tires at 65PSI is more than enough for the weight of the trailer. Running them at 65psi instead of 80psi isn't going to cause them to overheat or shorten their life, either.



Try running your truck tires at sidewall PSI all the time, see how you like it. Then think about how much harsher the ride is for the trailer and everything in it by running the tires at 80psi when the trailer never called for LRE tires @ 80psi.



But what does the tire mfr know, it's not like they engineered, tested, and manufactured it.
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Old 04-06-2019, 04:26 PM   #14
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Originally Posted by DieselDrax View Post
Do you have LRE tires on your truck? If so, do you run them at sidewall PSI even when empty?


Do you run all your tires on all your vehicles at the sidewall PSI or do you follow the mfr recommended pressures for empty/light load and increase the pressure when loaded?


You don't have to run LRE tires at max load PSI to "take advantage" of them and running them at the PSI listed in the load/inflation chart. Even running the LRE tires at 65PSI is more than enough for the weight of the trailer. Running them at 65psi instead of 80psi isn't going to cause them to overheat or shorten their life, either.



Try running your truck tires at sidewall PSI all the time, see how you like it. Then think about how much harsher the ride is for the trailer and everything in it by running the tires at 80psi when the trailer never called for LRE tires @ 80psi.



But what does the tire mfr know, it's not like they engineered, tested, and manufactured it.
I also didn't miss the fact that he doesn't know what it will weigh 8000 ,8500 or more . also he doesn't know which tire will be carrying the max or most weight . you can always let air out. i gave my opinion based on unknown weights better safe then sorry . I know what i need to run in my Truck loaded and unloaded . i know what i need to run on my TH . OP is guessing at weights and pressure . he can do what he feels is right but you seem to not like others opinions
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Old 04-06-2019, 08:51 PM   #15
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He should just run them at what the inflation chart says. If he ran 65 with the Ds he should run 65 with the Es. They won't run hotter than what the Ds would with the same load. Follow the manufacturers recommendation. That's why they put out the chart.
Common sense right there. 80 PSI unnecessarily will just wear the middle of the tires more.
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