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Old 05-20-2018, 02:27 PM   #1
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Tire Pressure Question

Original tires (ST205-75-15) on my 2013 Jayco 22FB (4600#'s) were rated at 50 PSI. The new Goodyear Endurance (same size) are rated at 65 PSI.

Do I need to run at the max 65 PSI or can I do 50 PSI.
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Old 05-20-2018, 02:46 PM   #2
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Sounds like you have a higher load range tire now. I would use the cold psi as 65 on the new tire.
C’s usually are 50 vs D’s at 65 psi cold.
That’s a good thing!
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Old 05-20-2018, 02:47 PM   #3
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[QUOTE=WayneG;641225]Original tires (ST205-75-15) on my 2013 Jayco 22FB (4600#'s) were rated at 50 PSI. The new Goodyear Endurance (same size) are rated at 65 PSI.

Do I need to run at the max 65 PSI or can I do 50 PSI.[/QUOTE
The max tire rated capacity is at max psi 65. You lose a little capacity for ea. lb. of air that you remove. Depends on how much your trailer weights verses the the tire capacity. Their is a chart somewhere on the internet that tells how much you loose with ea pound of air lost. Also remember if you lower the pressure to much the tire runs hotter.
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Old 05-20-2018, 03:25 PM   #4
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Weigh the trailer and match tire pressure to the weight. 65 psi is maximum pressure. I had G614 on our PINNACLE which are rated at 110, but based on weight, per Goodyear, only ran 95 lbs.
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Old 05-20-2018, 03:51 PM   #5
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I would run them at 65. My 2017 23RB is 6500# GVWR. My TT came with ST205/75R15 LRD GY Endurance tire. The TT's Yellow sticker calls for 65#.
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Old 05-20-2018, 04:38 PM   #6
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WayneG, you just got a much stronger tire. The old tires were likely rated for 1819# each, but your new ones are good for 2149# each when inflated to 65 psi*. Even if you don't need the extra capacity, it is comforting (to me) to know that the strength is there. I recently replaced my OEM "china bomb" tires with Goodyear Endurance, going from load range C to D and slightly increasing the width, and gained 450# capacity per tire. It was worth it just for my peace of mind.

* If you inflate the new tires to 50 psi rather than the maximum 65 psi, they are only rated like the old tires.
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Old 05-21-2018, 08:21 AM   #7
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Quote:
Originally Posted by Homersimpson View Post
WayneG, you just got a much stronger tire. The old tires were likely rated for 1819# each, but your new ones are good for 2149# each when inflated to 65 psi*. Even if you don't need the extra capacity, it is comforting (to me) to know that the strength is there. I recently replaced my OEM "china bomb" tires with Goodyear Endurance, going from load range C to D and slightly increasing the width, and gained 450# capacity per tire. It was worth it just for my peace of mind.

* If you inflate the new tires to 50 psi rather than the maximum 65 psi, they are only rated like the old tires.
x1.

Travel trailer (TT) manufacturers typically use tires that just barely support the GVWR. So, inflating TT tires to their maximum pressure is typically mandatory just to meet the TT's GVWR.

The opposite is true with most car tires. It's very uncommon for a car manufacturer to recommend inflating OEM tires to their maximum inflation pressure. That's because car manufacturers typically install overrated tires at the factory (total load capacity exceeds GVWR). They can meet load requirements when inflated below the maximum rated pressure of the tire.

When one upgrades their OEM TT tires from, say, C to D, or E to G, you're doing the same thing most car manufacturers are doing at the factory---installing tires that are capable of a load rating higher than the GVWR. So, like your car, you can keep the tire pressure of the higher-rated tires at the original OEM recommended tire pressure (while still meeting the TT's original load and GVWR requirements) . . . or, you can inflate the higher-rated tires to their maximum rated pressure (for the added safety margin . . . downside being a rougher ride and possible irregular tire wear). Your choice.
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Old 05-21-2018, 10:22 AM   #8
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I'd run them at max psi.
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Old 05-21-2018, 11:46 AM   #9
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If tire manufacturers state 65 psi, that is what you go with if you want the warranty to be any good. I know, I've already faced that situation head on!!
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Old 05-22-2018, 04:39 AM   #10
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I will also suggest running at 65psi.
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