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Old 11-20-2018, 10:45 AM   #1
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Tow vehicle tire pressure

From the ETI Owners Manual. Page 10.

"ē Inflate the rear tires of the tow vehicle to their maximum cold pressure. (See the maximum pressure rating on the tire sidewalls.)"

On my tow vehicle the max carrying weight per tire is 2,337# at a max inflation pressure of 51#.

The recommended tire inflation pressure on the door post is 32#. Nowhere in the Jeep Owners Manual does it talk about increasing the rear tire pressure to the max when towing.

Wondering what others are doing in regards to increasing the tire pressure when towing.

Thanks

Ed
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Old 11-20-2018, 10:54 AM   #2
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The maximum load rating of tires is always stated at the maximum cold inflation pressure. At lower pressures the max load rating is less. There are so many different vehicle / trailer / tire possibilities that it's hard to generalize a "one size fits all" recommendation, you have to consider the load that is on your rear tires with the trailer tongue weight added and then consider what pressure may be needed to safely handle that. Many tires' maximum pressure is well above the actual weight they will be carrying - I run LT rated tires on my pickup whose max pressure is 80psi, but they don't need nearly that much to safely handle the load, they are just very heavy duty tires and if inflated to the max pressure would ride very rough. You can also experiment with different inflation pressures and see how it affects your ride.
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Old 11-20-2018, 11:12 AM   #3
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I recall the manual stating to inflate the tires to the max on the sidewall which is 50 psi, for the trailer, but do not recall anything about the tow vehicle which you should follow the yellow door sticker amount? Anyone else?
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Old 11-20-2018, 11:46 AM   #4
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I just read the on line manual quickly now and everything refers to the trailer tires.....
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Old 11-20-2018, 12:00 PM   #5
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Quote:
Originally Posted by cpaharley2008 View Post
I just read the on line manual quickly now and everything refers to the trailer tires.....
The quote in my original post came from Page10 of the Escape Owners Manual. Chapter 3; towing and leveling.

Here it is again.

g.
“• Inflate the rear tires of the tow vehicle to their maximum cold pressure. (See the maximum pressure rating on the tire sidewalls.)“

Perhaps I not reading this item correctly?

Ed
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Old 11-20-2018, 02:04 PM   #6
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Ed, that is what the Escape Owner's Manual says, and you are reading it correctly.

I don't take advice regarding the operation of my motor vehicles from the manufacturers of other vehicles. It may make sense in some cases to increase the tug's rear tire pressure when towing, some vehicle's owners manuals say to do that, and I have increased the rear tire pressure moderately in some cases, but a blanket instruction to use the maximum inflation pressure regardless of the tow vehicle should be disregarded.

A reason for the higher pressure could be to increase tire load capacity, but the vehicle manufacturer's recommended inflation pressure is high enough for the full rated axle capacity, and more air in the tires won't increase the capacity of any other component of the system (bearings, suspension, structure) and so does not permit exceeding the rated axle capacity.

Another reason for a higher pressure could be to increase the tire's lateral stability - and that's why I have increased it - but too much pressure can reduce traction and cause handling and stability problems. This is not something to play with blindly.
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Old 11-20-2018, 02:23 PM   #7
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Thank you, Brian.

I also found the statement odd but then, Iím a newbie with Escape so thought I would ask the Pros.

Iíve owned both an Arctic Fox and Casita. Neither recommended increasing the tire pressure.

Neither does my Jeep Owners Manual.

Iíll stick with the pressure recommended on the column in the Jeep.
33#

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Old 11-20-2018, 03:53 PM   #8
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Ed,
Do you have any questions about your new 21 and also check your Jeep spare tire, I found out that my truck did not have a full size spare acceptable for towing.
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Old 11-20-2018, 05:07 PM   #9
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Quote:
Originally Posted by cpaharley2008 View Post
... also check your Jeep spare tire, I found out that my truck did not have a full size spare acceptable for towing.
Ed has a 2018 Jeep Grand Cherokee Trailhawk. It comes with 265/60R18 tires on 8" wide alloy wheels. Based on the load capacity, these are Standard Load - load index 110 - tires, and not P-type. Apparently both a compact spare and full-size spare are unavailable, but a steel spare wheel is standard, which means that it has a spare which is at least approximately the full diameter (so not "compact"), but not the same as the 265/60R18 regular tires (so not "full size"). The placard on the door frame which gives the inflation pressures will show the spare tire size and type.

The Jeep Owner's Manual says not to exceed 50 mph (when towing, or when not towing) with the spare... but you can still use that spare while towing.

The manual says to put the flat regular tire in the cargo area (not specifically the spare tire well), so a regular 265/60R18 tire might not fit in the spare location. If it does fit, you could get another matching tire and have no restriction on towing (or even just driving when not towing) after getting a flat, but I don't know if this is a big enough deal to bother.

Online discussions suggest that this vehicle's spare tire well is just big enough to hold a 245/65R17; the 265/60R18 is about 20 millimetres wider and an inch or 25 mm larger in diameter, so that 18" tire likely wouldn't fit in the well. The same discussions suggest that the spare might be a 245/60R18, which is close enough to the regular size to work, but mismatched enough (in both width and diameter) that Jeep wants you to keep the speed down.
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Old 11-20-2018, 05:24 PM   #10
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There is always the roof rack, that is what Jon V did with his full sized spare in his Rav4 and the E17. It amazes me when auto manufacturers fail to think far enough ahead when designing options what impact these options may have on the ability to use the said vehicle with such options installed. The oversized tires on both my Ram and other vehicles is an example of such.
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