Tire pressure?

[DatacomGuy]

Towing this afternoon with the new tires..

Should I be airing up to the recommended 80lbs?

And all four tires right?

 

[DatacomGuy]

Ended up running 70 in the back, 65 in the front. Felt great.

 

[DannyMK2]

who recommended running 80psi?

 

[DatacomGuy]

Various threads i've read, whether here or elsewhere.. Recommendations are ALL over the place, which is why i posted the thread.

 

[DannyMK2]

80 psi is very high. going based on your sig, looks like your running 275/65/20 toyo at2's. the max pressure they are rated for is 80 psi. this is not the pressure you should be running. 65-70 is still pretty high, imo. i would chalk test the tires to make sure they are making proper contact with the pavement. with e rated tires, i would say somewhere around 45 psi should be about right for normal conditions, maybe 50 psi while towing, give or take a few psi.

 

[smurfs_of_war]

Your 20 inch rims aren't rated to handle that pressure. Max I would do is 60. All tire shops I have spoken with said 65 is the breaking point they have found on OEM rims that aren't rated for LT tires. I have personally always run at 50-55, 60 was the extreme for mine to test if it made a difference.

 

[DatacomGuy]

Hmm, good to know. This is why i post these questions.

 

[WulfGang]

I run 40 psi in what, iirc, are the same tires as you have, when not towing.

The 2 times I have towed with them I ran 65 psi and it felt real solid.


Regarding the psi breaking point of the stock 20" rim, I too asked the tire shop that put my tires on they had never heard of such.

The shop was Jack Williams Tire in Easton PA.


With all due respect, this is something that needs to be validated or debunked.

 

[smurfs_of_war]

With all due respect, this is something that needs to be validated or debunked.

I agree. I have yet to find any validation for it. I am inclined to err on the side of caution for now, but knowing for sure would be nice.

 

[NYCruiser]

A metal rim isn't going to fail at pressures that a tire can hold. The bead and valve may be another story.

 

[smurfs_of_war]

A metal rim isn't going to fail at pressures that a tire can hold. The bead and valve may be another story.

I think it has to do with the aluminum rims. They would likely fracture before they bent, wouldn't they? I don't know for certain... that's why I asked about the pressure.

 

[jadocs]

It depends on your truck. Do you have a 1/2 ton, 3/4 ton, 1 ton? Last I checked they were all RAM trucks. I think people assume everything is a 1500 on here. Here is the door sticker for my 2500 CTD

 

[smurfs_of_war]

OPs is a 1500 as is mine

 

[jadocs]

Yeah I was just trying to point out where the 80 psi numbers might be coming from.

 

[BoldAdventure]

I don't think that's where 80 came from. It's more likely it's from all the comments about aftermarket E load rated tires. Most have max 80PSI. A matter of fact, just two different threads I've read today from smurfs_of_war make mention of the 80 psi debate.

Most of the E load rated tires in 275/65R20 for example have a max PSI of 80.

 

[smurfs_of_war]

Yeah I was just trying to point out where the 80 psi numbers might be coming from.

Oh, gotcha

 

[DatacomGuy]

I don't think that's where 80 came from. It's more likely it's from all the comments about aftermarket E load rated tires. Most have max 80PSI. A matter of fact, just two different threads I've read today from smurfs_of_war make mention of the 80 psi debate.

Most of the E load rated tires in 275/65R20 for example have a max PSI of 80.

This..

 

[smurfs_of_war]

It's a recurring theme on most forums- if you don't have LT rated rims, LT max pressure is going to cause issue. You can look up load charts for your particular tire though- since you really only benefit from a stiffer construction of and LT tire on a 1500, you can inflate per their chart to match or increase your load carrying a bit. For example, mine exceed my load when inflated to 53PSI.

 

[loveracing1988]

I don't think that's where 80 came from. It's more likely it's from all the comments about aftermarket E load rated tires. Most have max 80PSI. A matter of fact, just two different threads I've read today from smurfs_of_war make mention of the 80 psi debate.

Most of the E load rated tires in 275/65R20 for example have a max PSI of 80.

I believe all E rated tires have a max pressure of 80 psi. All of the ones I've seen do at least.
I run 55psi in mine, in the winter they drop to 50 and then come back up to 55 in the summer.

 

[WulfGang]

I think it has to do with the aluminum rims. They would likely fracture before they bent, wouldn't they? I don't know for certain... that's why I asked about the pressure.

Thinking about this thread reminded me of something back in the day when we used to run ridges in Kentucky.

Nobody would run with an aluminum wheel. They said they are too prone for cracking/splitting in tight turns.

I have no evidence of this, of course, but, I too erred on the side of caution and always used steel rims