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Topic ClosedTV tire pressure

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IL-Podders View Drop Down
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Direct Link To This Post Topic: TV tire pressure
    Posted: 07 Mar 2015 at 10:57am
When starting on a trip that will put me on the road for several long days of driving, I start with a few pounds lower than the max.  I have found that during the summer, you get those pounds back as the temp goes up.  Gas laws.
Marv-N-Kathy
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Direct Link To This Post Posted: 07 Mar 2015 at 12:08pm
Originally posted by IL-Podders

When starting on a trip that will put me on the road for several long days of driving, I start with a few pounds lower than the max.  I have found that during the summer, you get those pounds back as the temp goes up.  Gas laws.

IIRC, tire pressures are spec'd when cold.  Which suggests that expansion due to heat buildup from driving is engineered in.
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Direct Link To This Post Posted: 07 Mar 2015 at 4:50pm
Originally posted by Luv2Q

Originally posted by IL-Podders

When starting on a trip that will put me on the road for several long days of driving, I start with a few pounds lower than the max.  I have found that during the summer, you get those pounds back as the temp goes up.  Gas laws.

IIRC, tire pressures are spec'd when cold.  Which suggests that expansion due to heat buildup from driving is engineered in.

+1... Cold pressure is the way to measure. It is anticipated the pressure will rise when they heat up, and the tire makers and vehicle builders plan accordingly.
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Direct Link To This Post Posted: 07 Mar 2015 at 8:05pm
Open the drivers door on you t.v. and there is a label with the recommended pressures for your vehicle, I use R Pod recommended pressure on the Pod.
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Direct Link To This Post Posted: 08 Mar 2015 at 9:19am
i run tire pressure recommended on the tire, not the door.  its a 20 pound difference.  hogone
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Direct Link To This Post Posted: 08 Mar 2015 at 9:55am
From the Car Talk web site:

"How do you determine the correct tire pressure for your car's tires?

"A lot of people check the pressure listed on the tires themselves, but that's actually the wrong place to look. The number on the tire is the maximum allowable air pressure — not the recommended pressure for that tire when used on your vehicle.

"The recommended tire pressure is almost always lower than the maximum tire pressure. Check your owner's manual to find out where to look on your vehicle to find the recommended measurement. This number usually is indicated either on the driver's door pillar, the glove compartment door or sometimes on the gas filler door."

Tire manufacturers' web sites make the same recommendations.

Also from Click & Clack, "Car Talk Tip: Check your tire pressure even if your tires look fine. Radial tires can be deceiving (they're sneaky little guys). They may look fine even when they're down 10 pounds of air — or overinflated by 10 pounds. So don't trust your eyes — use your gauge."

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Direct Link To This Post Posted: 08 Mar 2015 at 3:13pm
Tires are rated to their maximum carrying capacity when they are at their maximum rated tire pressure.  The rating on the door pillar sticker is the one the manufacturer recommends for the best passenger ride balanced against mpg and driving performance.  Basically, they need to ensure people don't complain about a harsh ride but they need to boost their fleet mpg rating as much as possible, too.  It is not the correct pressure for towing, when you want the least sidewall flex to prevent trailer sway and you are loading the tires much closer to their individual capacity.  Just because the pod's static tongue weight is ~300 pounds that is not the dynamic load it applies to the TV going down the road as it hits bumps, it can be several times that.

These same reasons are why a trailer's tires also need to be at their max rating - they are often loaded to the edge of their weight rating by the camper's design, and you don't want them to flex which will amplify sway.
Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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Direct Link To This Post Posted: 08 Mar 2015 at 8:09pm
Now, that makes sense.  Now that you mention it, I knew that but I somehow disremembered that.  I used to pull a 11000 pound horse trailer, and one needed all the air pressure that would fit to cut down on sway if a horse started moving.  I had one mare that absolutely would not tie in a trailer and had to be loose.
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