Tire pressures - tread wear - pics

Ok, so I admit that I have not done the chalk test yet. I run my pressures by the sticker at 29F and 32R which should be engineered, right? This doesn't make since to me since the front is heavier than the rear, but I'm no engineer. What I do notice is that the dust on my treads always extends to the outer edge of the front tires but not the rears. See the pics. I'm looking for input and thoughts here. Have any 2nd gen stock trd or's done the chalk test? Is what I'm seeing normal? Opinions?

 

subbed... need to upload when i get a chance.

 

Not to be an ass, but the front wheels turn which would account for the 'dust' extending out further on the treads.

 

kinda seems logic.

I've always ran my tires over the rated pressure on my cars. I mean 38 to 40 PSI. Never had any wear problem.

 

Not to be another ass, but the lower pressure in front combined with the heavier weight of the front end will squash the front tires down more, resulting in a wider contact patch of tire/road, and is the actual reason there is a wider patch of dust/wear on the front shoes.

Turning, while it does SLIGHTLY affect contact, wouldn't result a difference that dramatic.

OP, the reason for increased tire pressure in the rear that while the rear is indeed lighter than the front while empty, if you fill it to capacity, it's rather much heavier.

 

I run 35 all the way around seems to be good for everyday driving. If I were to haul something I'd put a couple more pounds in the rear.

 

i run 38 40 in mine and they handle wonderful and great wear. 265 70 16

 

I go by the max pressure on the sidewalls of the tires I am wearing-which is 35lbs, MINUS 4lbs so I run 31lbs alltheway around. The tires you see have 15,000 on them. The last set of the same ones had 60,000 on them when I changed them out and I could have gotten another winter out of them_I have never paid mind to the doorjam plaque because of what Chris pointed out. Plus IMO toyota wants to put a compromise in there for ride comfort. Mine says 28 lbs and I hated it not to mention the tread in the center wasn't even getting hit enough.

 

Thanks for all the input, asslike or not.

Here are my thoughts. The dust is basically a chalk test right? Instead of chalk wearing off and showing contact area, dust is sticking and showing contact area. So, who can give me a reason why I wouldn't ignore the sticker (which is for the stock 265's that I'm running not the 245's) and drop the rears until the dust matches the front, which appears to have good contact? Can always air them up before hauling. This is my 3rd 4WD (89 wrangler for 10 years, 96 Bronco for 10 years) and neither showed a wear pattern at reccomended pressures like I see on the Taco, so trying to get it right. I Appreciate all the input.

 

No, you are another ass. The OP already noted that the front was heavier and that the stated psi was lower than the rear.

And if you think that turning SLIGHTLY affects contact I have a set of track tires from my MGB GT that would beg to differ.

And no one has answered his question so let me: yes it is normal for the stated pressure.

 

OK, so normal for the pressure of 32 at the rears, from my picture, appears to be incorrect pressure for the normal unloaded state, agreed? Does anyone know what the real "correct" pressure is for a stock TRD OR DC with stock 265's? Surely I won't be the first to figure this out.

 

Maybe I should re-name the thread to "Bring on your best ASS" and it could be a free for all bash thread.

 

Turning does only slightly affect contact area...but it has a much larger effect on tread wear, because a driven tire resisting lateral and oblique shear forces takes a much heavier pounding than stock that is rolling. This is precisely why alignment is so important in minimizing tread wear to begin with.

You seem to be confusing contact patch and tread wear. They're very different.

That said, tire contact will be influenced by a vast list of things, including but not limited to:

- Tire size
- Tire air pressure
- Sidewall ply (via sidewall deformation)
- Vehicle weight
- Direction of travel (via suspension dynamics/sidewall deformation)
- Speed of travel (via suspension dynamics)
- Alignment values
- Track surface
- Tread pattern

So how bout this: Technically we're both right, although I'm more rightererer. Ass

Quite so.

Pressure's fine. Leave it at 32, unless you want to suffer decreased handling performance while laden. Matter of fact, if you're planning to carry a load near payload max, you might want to put in a couple extra PSI.

FWIW I run 32 at all four corners most of the time. But then my truck sees more bulky loads than heavy loads.

 

IMO between being lighter in the back and given the stiffness of your unloaded half ton springs-I suggest you deflate the rears to match the fronts. Windage if it is significant can toggle that bed at freeway speeds and cause premature wear on the rears. What is the max pressure PSI on your tires? Whatever that is put 5lbs less than that in your tires and you will be in the safe zone chris4x4 can come in and explain how air is part of a tire's construction etc.-he must be eating dinner cause he hasn't said much yet

 

What is the max pressure indicated on your sidewalls?

 

FWIW i would continue to run the higher pressure in the rear. if you are somewhere and see a good deal on a piece of furniture/ etc. you would then wind up with underpressurized rear tires. One of those things you would rather have the pressure and not need it...

If your worried about wear just think, thats the reason for tire rotations... so the outside of the rears get their chance when installed on the front...

 

soooo with my load E's i should run 75PSI???? errr i dont think so lol...

40 is about perfect...

 

Yeah that's a different story and a whole other world in tires.