Power Wagon Registry

Any one with a 2012/2013 power wagon ever get the curb weight of each axle? I know all I need to do is get my truck weighed, but maybe some one can chime in with their own weights.

I got my truck weighed on the way home today.

Front----4080 lbs
Rear-----3120 lbs

With my 37" Grabber X3s, that equates to 29 psi in the front tires and 22 psi in the rear.

So many people run larger tires that are over inflated!

What year is your truck?

olyelr wrote:What year is your truck?

the title says 2012


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Cool beans! I've wondered what mine weighs. I parked next to a truck scale last weekend and really wanted to get the numbers. I have no idea how to use a truck scale though... Could you enlighten me?

Also how do you calculate your tire psi?


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Using load inflation tables from the tire manufacturers.

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Lol. You can also find out the tires ability to handle weight at different psi by dividing load rating by psi rating. Like 3500lbs/50psi for a 37". Then figure out the right psi for the actual load combined axle and you come up with 20-25psi for the rear and then just go to 35lbs rear and 40front lol

Hahaha. Well I have 40/40 right now. I might try even lower following their chart. 25/20 seems awful low to me though lol.


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More air volume in tires means higher load cap at lower psi. On the other side I have trailer tires that are 14ply that have 100psi in them and they support no more than a 37 at 50psi. But damn they are literally bulletproof lol

My truck is a 2012.

If you can get the load inflation chart, that's the best way. If not, then like nts007 said, take the max load info from the tire wall.

Max load in lbs divided by max psi gives you lbs per psi. My Grabbers are rated 3525 lbs at 50 psi which equates to 70.5 lbs per psi.
then divide your axle weight by 2, as the axle will be held up by 2 tires, each tire holding half the axle weight.
So my axles are 4080 so half is 2040. Now divide 2040 by 70.5 and you get 28.936 or 29 psi. Repeat for rear axle.
3120/2=1560. 1560/70.5=22.127 or 22 psi.

These are just starting points. To really hammer down on the correct psi for proper tire tread wear, do the chalk test.

The chalk test:

Find a flat long area. Take some sidewalk chalk and chalk your tires from edge to edge at least 2-3 lugs wide. Now drive in a straight line for 100 feet or so, and then reverse straight back. Now check your chalk marks on your tire. If the center is worn off more than the edges, you are over inflated. If the edges are worn off more than the center, you are under-inflated. If it's worn off evenly, you guessed, just right. Some people recommend adding 10% to that number.

Remember, it's the volume of air that hold your truck up. If your stock tire(285/70r17 or what ever) was supposed to be at 60 psi, for numbers sake, lets say that was 60 cubic feet of air. If you put that same volume of air in a larger tire, like 37x12.5r17, the psi will drop. The volume stays the same.

Hope this answer a few questions.

On my motorhome. I had to weight it to get the correct air pressure for the tires. So this is no different then that. A lot of guys here are running too much air pressure. Just because it says so on the door sticker. That sticker is for max weight.

Correct. The door sticker is for max load on original tires.

RustyPW wrote:On my motorhome. I had to weight it to get the correct air pressure for the tires. So this is no different then that. A lot of guys here are running too much air pressure. Just because it says so on the door sticker. That sticker is for max weight.

And to keep the stupid TPMS happy...


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Tpms happiness is not a priority for most of us

nts007 wrote:Tpms happiness is not a priority for most of us

My light has been on since 2008.

Do you drive a power wagon or a motel 6?

Colibri wrote:Do you drive a power wagon or a motel 6?

Stepped in that one.

No Tell Motel. Where you get 2 clean sheets, 2 beers, and a condom. And get charged by the hour.

Other than comfort, are there benefits to running less air? I keep mine at 45 (37 hankooks).

Socalboarder wrote: ...
Remember, it's the volume of air that hold your truck up. If your stock tire(285/70r17 or what ever) was supposed to be at 60 psi, for numbers sake, lets say that was 60 cubic feet of air. If you put that same volume of air in a larger tire, like 37x12.5r17, the psi will drop. The volume stays the same.

Hope this answer a few questions.

Actually the volume is irrelevant. It is the internal pressure (psi) on the tire surface multiplied by the contact patch area determines the weight that the tire is carrying. larger diameter tires will have a larger contact patch for two reasons - they are typically wider and have a larger radius of curvature, both which increase the contact patch area and reduce the required internal pressure required for the same load.

As you apply more load to a tire, the contact patch size increases (the tire flattens) and the pressure rises ever so slightly due to a reduced volume space for the same amount of air in the tire.

Just remember boys. When the bottom of the tire is flat the top half is still full

2011TXPowerWagon wrote:Other than comfort, are there benefits to running less air? I keep mine at 45 (37 hankooks).

It gives you a nice squishy feeling when you turn. Haha no, ride quality is the only reason to drop pressure. Some guys keep their tires at off-road pressure all the time and don't air up higher for street. Depending on the tire that may be perfectly fine or may be nuts.


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That's like wearing a condom 24/7 just in case lol. Safety first!

DamageWagon wrote:

2011TXPowerWagon wrote:Other than comfort, are there benefits to running less air? I keep mine at 45 (37 hankooks).

It gives you a nice squishy feeling when you turn. Haha no, ride quality is the only reason to drop pressure. Some guys keep their tires at off-road pressure all the time and don't air up higher for street. Depending on the tire that may be perfectly fine or may be nuts.


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The key is finding the correct pressure for the current use. Low pressure works great off road, but not typically on road (when extremely low). Plus too low of a pressure (or high) will wear tires out in a hurry when driving on the road day in and day out.

^^^correct


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