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Old 09-06-2021, 05:05 PM   #1
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What psi to run in tires?

Got a 2016 Escape 21. Has Goodyear endurance tires. Heading out for a short trip to Michigan Wednesday . Side wall says 65 psi but that seems a little hard to me. Trailer weighs about 4200 loaded. What are other people running in their Goodyear Endurance tires? Thank you
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Old 09-06-2021, 05:54 PM   #2
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My formula for a correct tread footprint is to take the max load rating on the sidewall of tire and put that into a denominator, then actual load of tire into numerator. This creates a fraction. Multiply that times the max cold psi pressure.

For example, I have a 5th wheel (16500 GVWR)and have G rated Sailun S637 tires, max load of 4400 lbs at 110 psi. My heaviest on CAT scale is 12,300 lbs for all four tires, so that’s 3075 lbs on each tire.
So formula is 3075/4400 = .698 Then .698 x 110 = 76.78 psi. Then add a 10% safety margin for hauling extra fresh/gray water. However, because they are G rated (factory rating was E) I choose 95 cold psi on avg. since I might carry a full 75 gal freshwater from time to time, plus more if I add more as I have 135 gal total waste tank capacity and decide to dump at next campground if there’s a long line in the morning. They’re all at about 91 psi right now as it’s been cooler up north here since I left a hot Texas two months ago.

Also, get a TPMS if you can. I never tow my rig without a set.
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Old 09-06-2021, 05:56 PM   #3
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Use the load chart from Goodyear.
https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

With a tandem axle Escape you will easily meet the load even at lower inflation pressures. Most are probably running 40 - 50 psi. We run 50.
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Old 09-06-2021, 06:06 PM   #4
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I’m running about 52 cold most of the time. On a hot day (85F) they will go up about 4 or 5 PSI by late afternoon when I stop and be back down in the morning.
Our 21 weighs 4360 loaded. Goodyear Endurance.
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Old 09-06-2021, 07:25 PM   #5
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Originally Posted by rubicon327 View Post
Use the load chart from Goodyear.
https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

With a tandem axle Escape you will easily meet the load even at lower inflation pressures. Most are probably running 40 - 50 psi. We run 50.
What surprises me is that the chart uses 87 mph as the rating speed. Most tires are rated at 55 or 65 mph. That gives more leeway to reduce the pressure if you drive below 87.
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Old 09-06-2021, 07:31 PM   #6
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Originally Posted by Viajante View Post
What surprises me is that the chart uses 87 mph as the rating speed. Most tires are rated at 55 or 65 mph. That gives more leeway to reduce the pressure if you drive below 87.

87…Dang. Woe to those who tow at 87. Worse when it’s 90 plus outside. My young nephew said he and his wife tows his lightweight tent trailer at 80 on I-10 W of San Antonio in TX which is the speed limit and I said never a good idea to ever do that. His trailer wheels are maybe 13”. Some people’s kids.
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Old 09-06-2021, 09:57 PM   #7
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Originally Posted by Viajante View Post
What surprises me is that the chart uses 87 mph as the rating speed. Most tires are rated at 55 or 65 mph. That gives more leeway to reduce the pressure if you drive below 87.
If a speed rating symbol is not provided, the default rated speed for ST tires is 65 MPH. Until a few years ago, almost all ST tires had only that default rating, but now they do commonly have a specific speed rating. M (81 MPH) and N (87 MPH) are now common for trailer tires.

A road vehicle tire rated at only 55 MPH would be rare, other than some specialty tires for mobile equipment used only at low speeds.

I wouldn't use running at less than maximum speed to justify reducing inflation pressure below the minimum pressure determined by load. I don't recall ever owning a car tire rated at less than R (170 km/h, 106 MPH), I've never driven anything at sustained speed that high, and it would generally be illegal to drive on a North American road that fast, but car tire pressures still need to meet the load-based minimum pressure.
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Old 09-06-2021, 09:59 PM   #8
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Quote:
Originally Posted by rubicon327 View Post
Use the load chart from Goodyear.
https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

With a tandem axle Escape you will easily meet the load even at lower inflation pressures. Most are probably running 40 - 50 psi. We run 50.
Using the load chart and the max allowed trailer weight and a worst case scenario of a flat tire on one axle - the remaining tire is inflated to a pressure that will support the trailer. For my rig I believe it was in the upper 20s. That became my absolute minimum but it leaves the tire too flexible for proper towing. At the other extreme I tried running at max sidewall listed pressure - 65 pounds. Thought my rig was going to shake apart on each road expansion joint.


Final compromise, a bit lower than Escape recommendations - around 46-48 set in the morning. Rides well, no odd behaviors and absorbs bumps reasonably.
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Old 09-07-2021, 07:16 AM   #9
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I have used 50 psi for the past 10 years with 4 different Escapes and will continue that with my next one....
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Old 09-07-2021, 01:50 PM   #10
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Quote:
Originally Posted by Iowa Dave View Post
I’m running about 52 cold most of the time. On a hot day (85F) they will go up about 4 or 5 PSI by late afternoon when I stop and be back down in the morning.
Our 21 weighs 4360 loaded. Goodyear Endurance.
Iowa Dave
Agree.
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Old 09-07-2021, 01:51 PM   #11
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Originally Posted by cpaharley2008 View Post
I have used 50 psi for the past 10 years with 4 different Escapes and will continue that with my next one....
You don't own your Escapes long enough to actually check the tire pressures.
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Old 09-07-2021, 02:51 PM   #12
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Originally Posted by Telescopist View Post
You don't own your Escapes long enough to actually check the tire pressures.
Agree
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