So I got my new AT/S set at about 38psi cold, that was set when it was about 0f out. Just got back from a little trip (about 50 miles) and could notice that I felt every little vibration in the road and it was pretty rough ride. Got home and check PSI and warm there were all around 45 PSI!

So my question.

Does nitrogen really work that well to keeping the constant psi?

It would also be nice if I could set them and not have to check them every few day when they temps change + & - 20-30 degrees.


Thanks guys

 

A. Are they stock size? I'd ran 35 stock size
B. Sounds like they need to be balanced or you have an out of round tire.

 

They are LT265-70-17, they are brand new....I know they are lt so that has some affect on it but when i first get out and they are cold at 38psi they were smooth as glass adn ride great. It seems to be anything higher then 40psi they ride gets a little rough and anything under 40 they are great.

I guess what I am asking is should they be expanding 7-9 pounds?

Does nitrogen do any better of a job at keeping a constant tire psi?

I know oxygen is already like 75% nitrogen but would that extra 25% help?

 

Nitrogen is a bunch of hype and costly. I wouldn't worry about it. I'd set them at 40 and leave it be. They're probaly 6 ply so 35-40 is fine.

Do they get rough as you go faster?

 

Yeah they are C load.....I think they do a get a bit rougher as I go faster as the tire temp rises the psi goes up. I was going right about 70 the whole way. Around town they are all good.

I will check my psi in the morning with a different gauge to make sure I don't have a jacked up up.

 

Sounds like they are out of balance to me. They don't rise as much as you think they do, and it shouldn't be a problem. Always check them with the same gauge though.

I do this for a living .. well until this spring then i'm walking out the door r

 

I dont have any shimmy in the wheel or pulling. There is a section of road that is about 3/4 of a mile long and I can take my hand off the wheel and it will stay straight like an arrow for almost that whole distance.

I drove on that part right after I got the tires to check them out...and they passed

Also I think it has a lot to do with jacked up roads all over the place and the pot holes....Even I said the ride was a little rougher during that 50 mile trip when I hit Smooth and flat areas of road the truck drove great.


One more thing

Am I correct when I say that the tires would expand more during the winter because of the greater temperature difference between tires and air temp?

Or would it be summer because of the tires making more heat?

Or am I not even close and sound Like I have no clue what I am talking about?


BTW, you don't work at Discount Tire do you?

 

i wouldnt worry about it, tires will expand from the air inside heating up as you drive. My tires do the same...I have my 33s at 38psi cold and when they warm up all the way they set at 43psi all 4 of em.....but I wouldnt think thatd give you a rougher ride.

 

38-40psi

 

So if I am reading this right, the tire heats up causing the air to heat up, makes sense

but my question is you say the tires are good on smooth roads but on crappy roads they are not good, is it just me or is there no problem here, it is not your tires it is the road, every tire will do that, you just won't feel it the same in every tire

 

Some tires are better for highway use than rough, country road type use. I notice with my Hankooks, the are great for highway driving, but country roads, you can really feel some of the bumps. Don't matter to me anyways... It's a truck...

On the other hand, my parents bought a set of 4 Yokohama AVID TRZ for the Compass, and they handle the rough stuff better than the smooth stuff. So... eh, each tire has it's own character.

 

you're talking about the goodyear at/s right?
if so, the problem is that the tire is trash.
My truck came with a set of at/s. I picked up a set of wheels and fuzion xti tires and it made a huge difference in the way the truck handled. I put the stockers back on for the winter cause the tread was still pretty good, but after the first snow I went out and bought a used set of tires to use for the winter. I'm glad I did. The used tires I got aren't even a major brand name. They're Canadian tire's brand Roughrider. Better than the goodyear at/s hands down. Both had similar tread wear and both are all-terrain tires.

 

All my past trucks with 6-plys ran much harsher. I don't need to haul heavy loads anymore so I stick with the P rated. Also, when cold out everything is stiffer, shocks, bushings and steel, not to mention the roads here are cracked and heaved.

 

Don't forget those lovely bridge joints too...

 

Those suckers are the worst.





I checked my psi this morning at they were all at 41 psi cold.....I dropped them to 35 and took a short freeway trip and the ride was much better. When I got home I checked them again and they were at 38 psi warm.

How they got to 41 cold I'm not sure, must have put a little more in then I wanted to or I am going blind and can't read the dashes right