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Old 12-03-2017, 05:11 PM   #1
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Air pressure in upgraded tires?

After a blowout on the original tires from the factory (2nd day after purchase - E rated cheap junk!) I upgraded to G rated tires all around. Ive had it on the road quite a bit since and no issues. Here's my question for the group:

The sticker on the 5th wheel recommends 80 psi but, of course, that was on those junk tires that I should have refused delivery at purchase. The rating on the new G-rated tires is "up to 110 psi". Where would you run them? I've been going at 90 with no problems other than I feel like the trailer bounces too much on the rear but I'm not sure that's the tires fault.

110 seems way too high. Should I run 80? Or stick with my 90?

Thanks all. Really enjoy all the info and opinions gained here.
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Old 12-03-2017, 05:35 PM   #2
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What are your rims rated for. I run 100 in my G614's. ( Cold temp.)

My rims are rated for 110 psi.
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Old 12-03-2017, 06:20 PM   #3
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I had the same experience. A bit of research informed me that the rims were rated at 80#. I’ve upgraded to HD rims and carry 110# in the tires.
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Old 12-03-2017, 07:13 PM   #4
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I run 105 in mine cold and my readout towing goes to about 120 to 125 psi.
Truck rear tires at 80 psi go to around 95 psi. They have a chart for axle weight to run PSI but I have not done that yet.
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Old 12-03-2017, 07:22 PM   #5
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I used to run mine at 110 all the time. I have since dropped them to 105 just to give a little cushioning. Really I’m just experimenting to see if in fact it does give extra cushioning or not.


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Old 12-03-2017, 07:35 PM   #6
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I kept 100# in my G614’s for about a year and constantly worried about the 80# rims. Pulled the trigger on the new rims and like magic my worries went away, at least about the rims.
To my point, I don’t feel any difference in the ride at 100 vs 110#.
My last visit to the scale said my GVW was 13k# with 3k# on the pin.
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Old 12-03-2017, 08:54 PM   #7
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I've not changed my rims so I'm assuming they are rated at 80 psi. If I stay at pressures above that with these upgraded tires I'll likely need to upgrade the rims too.
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Old 12-04-2017, 04:24 AM   #8
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My rims are rated for 110psi and I run my G614's at 110psi cold. I replaced the E rated tires after my first trip.
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Old 12-04-2017, 06:43 AM   #9
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I'm running S637's @ 100psi. My rims may or may not be rated to 110psi depending on which source I believe. So far no issues and I check them for cracks. The G-rated tires are so stiff you could probably run them at 0psi and not notice a ride difference. I have >20,000km on mine.
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Old 12-04-2017, 07:43 AM   #10
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Originally Posted by GretasDad View Post
I've not changed my rims so I'm assuming they are rated at 80 psi. If I stay at pressures above that with these upgraded tires I'll likely need to upgrade the rims too.
Look at the backside of the rim, and there should be either a max psi, or more likely a max weight rating for the rim. The max weight can be matched up to the equivalent tire max pressure per the tires max weight.

If for some reason the rim isn’t stamped with the info, email Jayco with your vin and possibly even a pic if your rim, asking for the max weight/ pressure rating for the rim.

Good luck!!!
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Old 12-04-2017, 08:01 AM   #11
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Tire pressure is a function of vehicle weight, not the tire's max carrying capacity. G rated tires at 110 psi are capable of carrying around 3750 lbs each. If your RV is under 3000 lbs each (typical E tire rating at 80 psi) your tires would be over-inflated at 110. Run a heavier tire at the psi on the vehicle yellow sticker, not the tire sidewall. It will be more durable than the lighter tire but still provide even tread wear and the best ride.
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Old 12-04-2017, 09:19 AM   #12
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I've not changed my rims so I'm assuming they are rated at 80 psi. If I stay at pressures above that with these upgraded tires I'll likely need to upgrade the rims too.
Most Rv rims come from this manufacturer. Wheels See if you can match them up and it will give you the pressure/load rating given the specific size. Or contact them, they're really good about helping.
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Old 12-04-2017, 10:04 AM   #13
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Y'all are getting me concerned, now. I just bought a 377RLBH. It comes with the new Goodyear tires, and they are E rated.
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Old 12-04-2017, 11:16 AM   #14
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Monty, you should be fine. As a general rule I believe the formula goes like this. Your 377 from the factory weighs 14254lbs, subtract the published dry pin weight of 2820lbs = 11434lbs.[on the tires going down the road] Your e-rated Goodyears on 16'' rims are rated at 3420lbs per tire=13680lbs of load carrying ability. So 13680lbs of load carry minus 11434lbs on the tires leaves you with a 2246lb cushion for loading your trailer. The jury is still out on the Endurance but a lot of people on here have upgraded to them. Hope this helps.
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Old 12-04-2017, 12:04 PM   #15
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Thanks. I was just glad to see it didn't have the Chinese tires on it. I would have had them changed out if it did.
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Old 12-04-2017, 04:29 PM   #16
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Glad to hear that you've upgraded. I as well upgraded to 14 ply some time ago. I also run a DILL TPMS which gives me the pressure and internal temperature of each tire. Mine, like yours are rated for 110 psi, which I don't recommend during the summer months when the outside road temperatures exceed 130 degrees. So after a couple years of monitoring the pressure and temperatures I've found that my best running pressure is 106 lbs. Here are some of my stats; Winter, start 106 lbs cold, after some mileage on the freeway my pressures are running around 114 lbs and the internal temperatures are about 90 degrees, Summer, start 106 lbs, after some mileage the pressure is running around 118 -123 lbs with the temperatures running 100 - 135, this varies depending on time of day and outside temperatures.

As for the wheels, I just put 14 plys on my new Eagle, the rims that came with the trailer were rated high enough so my tire guy didn't have any issues putting them on.
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Old 12-04-2017, 08:13 PM   #17
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I'm running my G614's at 100psi.
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Old 12-04-2017, 08:16 PM   #18
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Y'all are getting me concerned, now. I just bought a 377RLBH. It comes with the new Goodyear tires, and they are E rated.
We are NOT talking about the new Good years.............

They are talking about the Chinese tires that were coming from the factory.
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Old 12-05-2017, 05:14 AM   #19
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I run the Goodyear G114’s and for that tire Goodyear has an inflation chart. I pressure the tires to match the weight rating on the chart.
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Old 12-06-2017, 11:11 AM   #20
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I run the Goodyear G114’s and for that tire Goodyear has an inflation chart. I pressure the tires to match the weight rating on the chart.
I use that chart as well and find that my tire wear is much more even than it was always running at the max cold pressures. Most of the Tredit rims ( with the exception of the T 03) are rated at 110 PSI
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