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Just my imagination-right?

If you didn't have a load on you would just put the air chuck on and go back to doing what you were doing for a few minutes and forget how long it took. When you gotta get going it's seems to take forever. 110lbs is 110lbs weather it's laying down off the truck in the garage or it's overloaded with 120,000lbs and touching the sidewalls of the tire next to it. Still the same pressure. I worked with a guy who always would Jack up his car before adding air to the tire so he didn't stress the tire! Wasn't worth arguing about!
 
markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.

Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.

Maybe I'm wrong...someone explain it to me.

Thanks
 
My guess would be the pressure would be lower because of the increase in volume from the tire rounding out. But in most cases the tire volume and shape won't change that drastic.
 
Load or no load the psi stays the same within reason. Even
though the tire may be flat because of an overload it widens
on the sides

We did have a young mechanic one time convinced the tires
are easier to lift and load if you let some of the 110 lbs. out of the tire!
 
You are correct, it does seem longer, but isn't. In fact you put a bit less air into it to get to 100 psi than if it were unloaded. The reason you bother to put air in the dang thing is because when you loaded it you noticed it was low (probably 20 psi) thus you had to fill it. If you just check them and it is down even 10 psi it is easier to fill. or you didn't check them and it looked OK. Jim
 
eye4iron- "Load or no load the psi stays the same within reason. Even
though the tire may be flat because of an overload it widens
on the sides"...

If the tire pressure difference is insignificant and the sidewalls accommodate for the change, then why is there such a 'BIG' recommendation to be sure to check tire pressure between winter and summer driving?...Shouldn't the sidewalls make up for this difference(by your explanation)?

Just curious...
 
A change in temperature does make a significant difference in the pressure.

That's different from same temperature but different load on the tire.
 
I am surprised no one has figured this out....That tire probably has summer air, and now you are trying to add winter air??? That never works out well. Get yourself some cans of all-season air or just wait to add air this coming summer. Your mileage will get better, also.
LA in WI
 
Well, as one of your purveyors of cowboy wisdom (Baxter Black I think) puts it

100 pounds of salt is heavier than any other 100 pounds.

So must be like that?
 
(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.

Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.

Maybe I'm wrong...someone explain it to me.

Thanks
Click to expand...

Think of it like this...

The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.

Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.

Not sure if that makes sense to you or not...
 
Yes your correct, but if your filling the tire to 110lbs while squished down then it won't take any longer to fill, in fact slightly less I suppose if the tire was compressed to the point the volume was less
 
A professor once told me this: if you could measure the area of contact between the tire and ground, and know the weight of the vehicle, you can know the air pressure in your tires by: # of tires x area of contact between tire and ground in inches, devided by the weight of the rig in lbs. So when a truck or trailer is loaded, there is more of the tire in contact with the ground, and less when unloaded, allowing for pressure to stay constant. The key is pressure is lbs/inch squared often noted psi.

Now to the original question, Im not sure, but perhaps the amount of work needed to change the pressure of a loaded tire 10psi is greater than to increase the pressure of the unloaded tire 10psi, which could be noted in time required.
 
Just hook the air hose up and go to lunch. A co worker did that and blew the shop door out, when the tire blew. I don't think he lasted the rest of the week.
 
Our county used to remove flats from their trucks and bring them to us to fix, one of their guys unloaded a flat 10.00X20 tire and was struggling to roll it across the parking lot. I told him "If you will put some air it that tire it will roll easier" He said "oh no the more air you put in it the heaver it is".. he actually believed that. I finally convinced them to bring us the trucks and we would remove the tires and put them back on.
 
It will weigh more with pressure in it, but it would take a very sensitive scales to measure it! But it will roll easier with some pressure in it.
 
You are right Tom and it is quite a bit too. Something like one pound for every ten degrees? Might be a bit more.
 
(quoted from post at 21:37:55 02/10/16) eye4iron- "Load or no load the psi stays the same within reason. Even
though the tire may be flat because of an overload it widens
on the sides"...

If the tire pressure difference is insignificant and the sidewalls accommodate for the change, then why is there such a 'BIG' recommendation to be sure to check tire pressure between winter and summer driving?...Shouldn't the sidewalls make up for this difference(by your explanation)?

Just curious...
Click to expand...

Don't know. I do know if you check your tire before a load it will have the same psi as when you check it after the load is on the tire.
Possibly the difference between summer and winter is the density of the air. Splitting hairs.
I would hope the tires are checked more often than in between seasons
 
(quoted from post at 04:45:59 02/11/16)
(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.

Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.

Maybe I'm wrong...someone explain it to me.

Thanks
Click to expand...



Think of it like this...

The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.

Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.

But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.

Not sure if that makes sense to you or not...
Click to expand...
 
(quoted from post at 20:24:42 02/11/16)
(quoted from post at 04:45:59 02/11/16)
(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.

Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.

Maybe I'm wrong...someone explain it to me.

Thanks
Click to expand...



Think of it like this...

The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.

Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.

But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.

Not sure if that makes sense to you or not...
Click to expand...
/quote]

Try this again

But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
Click to expand...
 
(quoted from post at 23:27:26 02/11/16)
(quoted from post at 20:24:42 02/11/16)
(quoted from post at 04:45:59 02/11/16)
(quoted from post at 00:02:47 02/11/16) markct- Just thinkin' about what you said. Let's say you overloaded a trailer and the tires are almost flat. You pump the tire to 32 lbs. and it does not raise the tire at all.

Once you remove the load from the trailer, the tires are fully filled and no flat. So, when you then check the tire pressure, it should be less than 32 lbs. because you have filled up more air space in the tire thus lessening the pressure. Therefore, 110 lbs. may not= 110 lbs. afterward.

Maybe I'm wrong...someone explain it to me.

Thanks
Click to expand...



Think of it like this...

The axle is in the center of the wheel, and the axle carries the load to the tire. As the load increases on the center of the tire, it puts more pressure on the bottom of the tire, which compresses and distorts and moves the air to the upper part of tire, above the axle. So, at any given moment the pressure inside the tire is the same, but the air is being displaced from under the axle as the load on the axle increases.

Now, imagine you have a tire with 10 psi in it, and it is laying on the ground, flat. If you put a heavy weight on top of the tire, the air will be compressed inside the tire as the load is from above, not from the center. Think of air bags suspension on a big truck. Most guys who drive triaxle can roughly tell you how much weight they have in the truck by the air pressure needed in the bags to keep the suspension up.

But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.

Not sure if that makes sense to you or not...
Click to expand...
/quote]

Try this again

But how do I know whether or not the suspension is up or not? I flip the switch and hear air released from the bag that holds the dolly axle up, but I have no read-out of how "up" my suspension is. I know that if I get too much pressure in it the truck doesn't steer.
Click to expand...


When I wrote that, I wasn't thinking about a tag axle, but rather, the regular air suspension bags. Regular air bags, use air bag pressure to push the suspension down away from frame, keeping the truck up. So when I said, "keep the suspension up" I guess what I meant was "keep the frame up?" I do know that my hauler knows when I get him within a few hundred lbs of his limit based on the pressure in the bags. I've never (unintentionally) put him over his limit yet.
Click to expand...
 
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