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Old 06-03-2019, 11:20 AM   #1
ASLover
 
2007 25' Safari FB SE
Louisville , Kentucky
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TV tire psi recommendation

I have F150 with Michelin Defender LTX tires. Truck says to inflate to 36 psi. Max on sidewalk is 44 psi. Towing 2007 25’ FB Safari.

Is there any advantage going above 36 psi on the TV? If so what is best psi.
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Old 06-03-2019, 11:30 AM   #2
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2007 27' International CCD FB
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Hi Greg.

Easy answer is yes, there's definitely advantages to running higher pressure when under tow.

From a load perspective, the tires swill support things just fine even at the factory recommended 36psi.

However, higher pressures will lend more sidewall stability for better tracking and resistance to sway. Potentially at a cost of incrementally rougher ride. Feel free to try a few different pressures. I would recommend 40psi as a good starting point.

I have different tires than you with large sidewalls, and are LT type tires with expanded pressure and load capabilities. As an example, I run 36psi when not towing. But 44psi when towing (my tires are rated to 65 psi max).

For your p-metric tire, I think you'll find 40 to be a good sweet spot for added stability yet good comfort.
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Old 06-03-2019, 12:13 PM   #3
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Well you are towing and loaded, I would say keep them pretty close to max pressure. How close are you to the max load on each tire? Running empty 36psi is probably ok. Are you using load distribution?


Perry
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Old 06-03-2019, 04:19 PM   #4
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Yes I am using a Blue Ox WD hitch.

Thanks for the advice folks!
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Old 06-04-2019, 10:23 AM   #5
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To add, make sure to measure and add when the tires are cold. Preferably in the morning.
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Old 06-04-2019, 01:54 PM   #6
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I run Bridgestones, not Michelins on my TV but they also have a max cold inflation pressure of 44 psi.

I run the fronts at 40 and the rears at 44 psi (cold) when towing.
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Old 06-04-2019, 11:49 PM   #7
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Pressure

I ran 45 PSI and the handling was much improved. With the trailer on the pressure was not a problem. I even tried 50 but increased pressure when running hot had me back it down.



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Originally Posted by gregshade View Post
I have F150 with Michelin Defender LTX tires. Truck says to inflate to 36 psi. Max on sidewalk is 44 psi. Towing 2007 25’ FB Safari.

Is there any advantage going above 36 psi on the TV? If so what is best psi.
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Old 06-05-2019, 09:10 AM   #8
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Greg download the Michelin tire inflation charts and see what they suggest for a given weight. Get your weights for each axle at a truck stop CAT scale and set accordingly.
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Old 06-05-2019, 10:33 AM   #9
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This is not driven by hitch equipment or inflations charts for load rating. If one respects the door placard inflation pressures as minimums, there should be sufficient load handling.

Adding additional pressure to the tire is tuning for better stability and feel. Yes, icky subjective stuff. Objectively however, it will be more stable. To a point of diminishing returns where it now diminishes ride quality.

One still needs to respect the max inflation pressure as stated on the sidewall.
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Old 06-05-2019, 10:55 AM   #10
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Moderation

A guy I know ( a MECHANIC!!!!) tried inflating tires on his trailer for better gas mileage, had TWO blowouts within an hour.
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Old 06-05-2019, 12:41 PM   #11
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You can actually cause the center of the tire to overheat if you overinflate because now all the friction is in a narrow strip in the center. This is in addition to pressures that add up fast. 14.7 psi is 2100 lb/sq ft. So imagine the loads on a tire when the pressure is up around 80psi or more. Two ways to measure proper pressure. One is to mark the tire across the face with chalk and drive a few feet on pavement. The lighter areas indicate pressure. You want it even. Edges too light too little pressure. Center too light too much pressure. Another way is to run the tire till it gets to operating temperature and measure the temperature in the center and each side of the tread. Too hot in center means too much pressure too hot on edges means too little pressure.





Perry



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A guy I know ( a MECHANIC!!!!) tried inflating tires on his trailer for better gas mileage, had TWO blowouts within an hour.
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Old 06-15-2019, 09:26 PM   #12
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40 seems to be the magic number for my rig.

I took everyone’s advice and went from 36 to 40 for my trip to CO. It worked beautifully from a stability and ride perspective. Gas mileage of 11mpg hurt but I guess that is part of the deal. 2500 miles proved everything out.

PS. I ran AS tires at max pressure of 80. During trip I monitored them with TireMinder. Never got over 89psi or 95F. Seemed to work well.
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Old 07-25-2019, 12:26 PM   #13
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everything changes ...

once your road temp gets above 90 to 100 plus degrees. the tires will expand greatly along with an increase in psi. i run the tow at 42 front and 46 rear. AS at 75psi over 90 degrees.
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Old 07-25-2019, 01:16 PM   #14
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My understanding is that the recommended tire pressures on the manufacturer's door sticker are not only the nominal pressures designed to provide the best combination of tire wear, handling, and fuel economy but they are also the pressures that will support the max load carrying capacity of the truck.

For example, the tires on my F250 are rated (cold) for 60PSI front and 65PSI rear. While adding pressure will theoretically increase the load capacity of the tire, it won't increase the load capacity of the truck which is already at max at the stock pressures.

Increasing tire pressure may subjectively affect ride or stability but it becomes a trade off with other issues. I've experimented with different tire pressures and have found that with my setup things seem to work pretty well if I stick to the factory recommended pressure. YMMV.
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