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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 Goodyearís 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 doesnít 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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Quote:
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.

Donít exceed the rated PSI of the wheel, either.
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Old 04-04-2019, 05:30 PM   #7
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Quote:
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!

Quote:
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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Originally Posted by mulher View Post
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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