trailer blows inside tires

Good observation by flood. rollin coal Your post wasn't up when I typed mine. I hit enter and your post and mine came up simultaneously. At least we back each other up. LOL

 

Tires dont wear out prematurely or beat up the truck by overinflating unless its an excessive amount. I had a set of Bridgestone M720's on my drives, kept em at 120 all the time n got 420K miles outa them. They wore nice and flat, but Im not one to fly down the highway either, 58 is a good speed for me. It never caused shocks ot anything else to wear out prematurely. Id like to see where you read that 75 PSI is acceptabe for a tandem application when grossing 80K lbs. I would never think of going that low. Doesnt the DOT put ya outa service if your tires are more then 20% underinflated from what it says for max pressure on sidewall??

 

Yes, according to Michelins tire load and inflation tables I can go down to 75 psi.
A tires rolling resistance is calculated based on the tires proper inflation pressure for the given load.
The DOT use 50% of the max pressure printed on the sidewall.
I tried higher pressures initially but got poor tire wear, lowering them fixed the wear issue and gave me a smoother ride which I really needed as the 'highways' here in Saskatchewan are not 4 lane interstate. Heck they are not even okay blacktop. I do a lot of secondary roads and gravel. I gross 140,000 lbs.

 

Here ya go. According to this chart you can actually go even lower. XZE2 11R22.5 all position tire 17,520 lbs per axle at 70 psi, times two equals 35,040 lbs on a tandem grouping. So 80,000 is a piece of cake.
At 105 psi you could load 23,360 lbs per axle or 46,720 lbs per tandem, not that your axles or trailer would like it, but the tires would be good.
View attachment 82064

 

Exactly. And my rims also say "120 psi max". Cold inflating tires to 120 psi is over inflation. 50 miles down the road and they've got 130-140 psi depending on ambient temps. Max means "must put maximum" to some guys. I don't understand why anyone would air a tire up 10-15 cold psi over what the sidewall says. Seems dangerous.

 

The harder a tire is, the less rolling resistance you will have. 120 PSI is what the rim is rated for at 50*F. You will see for yourself in the summer when you have tires at 80 PSI. On a 90*F day in the summer, stop n check yer tire pressure, it will be 160+, but with 120 PSI in it, it will be around 140 PSI or so, given normal conditions. I have spent the time going to commercial tire seminars and know people who are non biased experts in the industry. A 11R22.5 tire can hold over 180 PSI before it blows, and believe it or not, a super single drive style tire will hold over 400 PSI before it blows. To each their own, but I will gladly roll easy down the road will full tires instead of 3/4 inflated tires and enjoy the fuel economy instead of paying at the pump for a lil smoother ride.

Like i mentioned earlier, I had a set of Bridgestone M720's that ran 420K miles at a constant 120 PSI and they were perfectly flat all the way around. Steers are BFG ST244 at 125 PSI w/ about 70K miles now n they are wearing perfect as well. Trailer tires are Bridgestone R197's at 120 PSI w/ 40K miles n they are just like new.

I am just saying this is what works for me, and it works great, but maybe its not for everybody. I have learned from the masters on how tires need to be inflated and was just trying to help by passing some worthy knowledge along. If you even blew yer tires up to the max pressure on the sidewall for a week, you would notice a big increase in fuel economy, especially with 32 tires on the ground.t Try it if you like...it definately wont hurt anything.

 

What is biased about an engineer saying tires that are properly inflated to the load they are bearing have the best rolling resistance?

 

I never said anybody was biased. All I said was the people I learn from are unbiased. Every load will require a different PSI for optimal performance, but who wants to be changing their tire pressure on ever load if the weight is different. I keep mine as hard as possible so if I have a heavy load, they are fine, if its a lighter load, they are still fine cause I dont drive fast enough to cause centrifical force on the center of the tire tread...

 

The important thing is to try to find what works best for you and your application. Just goes to show how diverse this industry is.
By the way, did the original problem described on this thread get solved?