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Old 04-20-2019, 01:28 PM   #1
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Tire pressures?

Finally did it. Upgraded my china bombs to Goodyear Endurance. Tire size is 225/75/15, the old tire pressure was 50lbs, now on the new ones the max pressure is 80 lbs. There is no markings on the rims to state what the max air pressure is. My question is do I run them at the 80lbs or should I lower the pressure? I should also state that the trailer has alloy rims if that makes a difference.
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Old 04-20-2019, 01:50 PM   #2
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Finally did it. Upgraded my china bombs to Goodyear Endurance. Tire size is 225/75/15, the old tire pressure was 50lbs, now on the new ones the max pressure is 80 lbs. There is no markings on the rims to state what the max air pressure is. My question is do I run them at the 80lbs or should I lower the pressure? I should also state that the trailer has alloy rims if that makes a difference.
Run them at whatever the tire says 80
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Old 04-20-2019, 01:52 PM   #3
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Originally Posted by Fun finders View Post
Finally did it. Upgraded my china bombs to Goodyear Endurance. Tire size is 225/75/15, the old tire pressure was 50lbs, now on the new ones the max pressure is 80 lbs. There is no markings on the rims to state what the max air pressure is. My question is do I run them at the 80lbs or should I lower the pressure? I should also state that the trailer has alloy rims if that makes a difference.
You will probably notice a bit difference pulling , when I went to 80lbs it seems stiffer and I noticed things moved inside while pulling
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Old 04-20-2019, 02:21 PM   #4
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Wheels are certified by the Society of Automotive Engineers (SAE). There are two different methods. One is wheel maximum load capacity. In that method any inflation can be used as long as the maximum load capacity of the wheel isn't compromised. Second is wheel maximum load capacity and maximum inflation pressure.

This is a straight forward quote from the USTMA; "Never exceed the maximum pressure and/or load capacity of the rim/wheel."

All wheels are required to display manufacturer information for contact information. Wheel manufacturer's are required to provide specification information on request.
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Old 04-20-2019, 03:11 PM   #5
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Hi, I recently had same question after upgrading axles and tires. Tire stores even vary in their advice, a couple said always max. pressure as on tire (80psi) the other said if not loading to max load (2830 lb) then recommended less pressure like 70 psi. A couple of RV friends said should go to max 80 or close like 75. I found 80 was too rough ride and things moved around inside, so I settled on 70 psi.
One other factor is wear too much will wear inside of treads, too little will wear outer edges, 70 seems to work for me to have even wear.
Finally I found that trailer tires (ST - Special Trailer) are constructed different from truck and car tires, the sidewalls are designed (apparently) to provide best stability while towing at the max pressure on side of tire (80psi).
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Old 04-21-2019, 11:10 AM   #6
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My Silverado says 60psi front and 80psi rear. Iím going to drop the rear to 70psi. My tires are wearing more in the middle and probably reduce the air five pounds in the front
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Old 04-21-2019, 11:36 AM   #7
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Quote:
Originally Posted by Fun finders View Post
Finally did it. Upgraded my china bombs to Goodyear Endurance. Tire size is 225/75/15, the old tire pressure was 50lbs, now on the new ones the max pressure is 80 lbs. There is no markings on the rims to state what the max air pressure is. My question is do I run them at the 80lbs or should I lower the pressure? I should also state that the trailer has alloy rims if that makes a difference.
I can't help you with the rims but Goodyear has a chart for the Endurance tires.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf
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