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Old 12-03-2017, 04:11 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, 04:35 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, 05:20 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, 06:13 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, 06:22 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 Iím just experimenting to see if in fact it does give extra cushioning or not.


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Old 12-03-2017, 06:35 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, 07:54 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, 03:24 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, 05:43 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, 06:43 AM   #10
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Quote:
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 isnít 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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