Ballast rim guard and proper inflation

[Texasmark]

I can really agree that volume doesn't matter because you are compressing the molecules.
Pressure and volume are inversely proportional to
each other. This means that as the pressure
decreases, the volume increases, and as the pressure
increases, the volume decreases. One way to think
of this is if you push on a gas by decreasing its
volume, it pushes back by increasing its pressure.
Interested in more comments.

I proved this on my motorcycle air bags that replaced my lawn mower springs.

I had a gauge on the bag. Set pressure was 5psig. I got on the seat and sat down and the pressure went up since the volume went down with me sitting on a soft bag. I recorded the pressure change. Then I bounced up and down on the seat which increased the pressure in spikes to a higher value because I decreased the volume more.

I then attached a tank to the system with a volume about 10x the previous volume. Set it to 5psig again. Did the same senario. Pressure variations were about 1/10 what they were previously.

On tractor tires in my stuff, I want a soft ride so I set them as low as I can considering the application. On my filled tires I play with the numbers on each machine till I am satisfied. It becomes a toss up of how much air volume do I leave with my fill (the weight of which helps to keep the tires on the ground and smooth over bumps better) vs how much pressure differential is my back going to feel when I hit a bump and the pressure spikes.

Another way of looking at it is that if you fill the tire to 100% liquid at the recommended pressure the tire will act like a solid object since the liquid doesn't compress and the tire is fully inflated. You could replace it with a wooden wheel essentially.

So, I fill to where the fluid is even with the valve stem which is about 10 or 2 O'Clock position on the mounted tire wheel assy. Then I set to the suitable minimum pressure the application will allow. This works good for me. My p/u truck runs at the rated 35 psig with no fluid fill. It has a soft ride by design and besides it has those babby sitters that squeal at you if you drop below a certain pressure.

 

[Todd727]

I'm with Bob...a "flat" tire with no weight on it contains the same volume of air as the same tire inflated to 100 psi.

Then what exactly are you adding to the tire to increase it's pressure?

If this were true, we also wouldn't gain anything by having our welding gas tanks at 2200psi or scuba tanks at 3000psi.

 

[ovrszd]

Then what exactly are you adding to the tire to increase it's pressure?

If this were true, we also wouldn't gain anything by having our welding gas tanks at 2200psi or scuba tanks at 3000psi.

Yep. Easy to get confused about that. A tire with 100psi of air contains a vast volume of atmospheric pressure air.

 

[Texasmark]

Yep. Easy to get confused about that. A tire with 100psi of air contains a vast volume of atmospheric pressure air.

Yes, about 100/14.7 = 6.8 times. Gotta think about what was said earlier in the post. If you weren't increasing the volume of air contained in the tire, just what is it that's flowing through the air hose when you pump it up????????????????????

 

[Todd727]

Yes, about 100/14.7 = 6.8 times. Gotta think about what was said earlier in the post. If you weren't increasing the volume of air contained in the tire, just what is it that's flowing through the air hose when you pump it up????????????????????

Yep, I was kind of in disbelief that so many folks went down that path. LOL

 

[ovrszd]

Yes, about 100/14.7 = 6.8 times. Gotta think about what was said earlier in the post. If you weren't increasing the volume of air contained in the tire, just what is it that's flowing through the air hose when you pump it up????????????????????

Some things I have a hard time understanding. So I try to be compassionate with others in that struggle.

 

[Looking4new]

I have tubes in my tires and R-G. they are inflated to 5# according to my gauge.

 

[4570Man]

This truck runs 8 psi. A F-650 with regular tires probably runs 80-100 psi.

 

[ovrszd]

This truck runs 8 psi. A F-650 with regular tires probably runs 80-100 psi.

Yep. I used a Big A as an example.

 

[4570Man]

Yep. I used a Big A as an example.

I bet the F-650 with regular tires rolls on firm ground with less friction though.