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Old 09-13-2018, 08:11 PM   #1
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What are you running for tire pressure?

We have a new 2019 250RDS Titanium which loaded weighs around 9000lbs.

Our tires are the Goodyear ST235/80R16 E tires. According to Goodyears tire inflation chart the inflation could be as low as 55 psi to carry the load, but I am wondering what others with similar weight and tires have found to run comfortably?
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Old 09-13-2018, 08:48 PM   #2
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ST tires in a tandem setting endure extreme sidewall stress. That's the reason most ST tire mfgrs. recommend inflating to sidewall maximum, and to avoid standard pickup tires that have lighter sidewalls.
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Old 09-13-2018, 09:41 PM   #3
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What does the inflation placard say on the side of the trailer?
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Old 09-14-2018, 07:10 AM   #4
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I fill my 15" ST-Es to 80psi.
That's the max I believe.
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Old 09-14-2018, 07:22 AM   #5
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I to asking this question. Yesterday I upgraded from Marathon 235 -15 D to the E version Endurance. Max tire now 80 vs 65 - My 22RB Creekside weighs max 7200 when fully loaded for very long trip-I left the dealer with 70 psi but would like more input/opinions as the question OP has asked.
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Old 09-14-2018, 08:21 AM   #6
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I run my goody years at 80psi....sidewall states that. Placard states that.
Never run less.....heat will destroy your tires and blowout.
Unless you tow for thousands of miles, your tires will time out before they wear out.
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Old 09-14-2018, 10:03 AM   #7
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I run max sidewall pressure on ST tires on multiple axle rigs to help reduce the effects of interply shear.
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Old 09-14-2018, 01:44 PM   #8
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80 PSI cold. The tire mfg's build them to take higher PSI's when they heat up. I run mine very close to 80 cold.
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Old 09-22-2018, 01:01 AM   #9
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E's = 80 lb psi

Quote:
Originally Posted by Highway 4x4 View Post
80 PSI cold. The tire mfg's build them to take higher PSI's when they heat up. I run mine very close to 80 cold.
Check the sidewall of the tire, E rated tires max pressure listed at 80 psi. That's what I also use with no problems on a Creekside 20FQ.

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Old 09-22-2018, 01:40 AM   #10
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Just had a friend have a major blow out - but the tire was not the root cause of the blow out - it was the valve stem. Yep, the tires were inflated to the recommended 80PSI but the stems were only rated for 60 PSI. This was a factory set up - so they are now on the hook to fix the trailer and make things right in terms of the remaining valve stems. This was also a toy hauler and the tire that blew was next to the fuel tank for the toys. He was lucky that the only damage was contained to the hubs, brakes, and axles.
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Old 09-22-2018, 05:43 AM   #11
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Quote:
Originally Posted by Randy the sly old fox View Post
...

Yep, the tires were inflated to the recommended 80PSI but the stems were only rated for 60 PSI.
...
Interesting.
Am now especially glad that we upgraded to steel valve stems when we went from 65 to 80psi tires (at the time I just did it for the TPMS).
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Old 09-22-2018, 12:09 PM   #12
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Maxxis 8008 225/75R15 10ply 80 psi cold E rated
Upgraded from the D rated GoodYear Marathon.
Irregardless of country of tire Manufacturing check tire pressure and tire wear very very closely.
The little piece of rubber is the only thing between your trailer and the road.
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Old 09-22-2018, 12:28 PM   #13
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I upgraded from the OEM Goodyears to Carlisle Radial HD but stayed with the original tire size, load range, and recommended tire pressure found on the placard. I found it somewhat interesting the tire shop just automatically installed steel valve stems, the originals were rubber.
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Old 09-23-2018, 07:34 AM   #14
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Thank you for the input everyone. When I first noticed the tire pressure on the side of my tires listed at "Max 80 PSI" I assumed that the inflation could not be higher than that, not to necessarily run at that.

I did inflate to 80 PSI cold and installed Fords TPMS trailer monitor on my King Ranch and headed cross country from Bend Oregon, headed for Nashville, (but stopping at most spots in between to play...) currently we are in the South Dakota Badlands area and the TT (250RDS Titanium) has pulled amazingly well.

Watching the TPMS the tires inflate to about 92 psi when they are hot, though the outside temps have only climbed to the low 80's.
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