One of my tires different from the rest.

One of my tires different from the rest.
Tires ****ing suck. I need to fill air up on my tires, and there seems to be a descrepancy between some of the tires.

Here's the tires, why is the R- number different for my back left tire? BTW, Theyr'e "Dominator Sport A/T" tires, whatever brand that is.

Back Left:
R-22772 (Why are all the other tires the same except this one? IS THIS TIRE SMALLER THAN THE REST???)
Design 9815
31x10 5OR 15LT
Load Range C

Front Left:
R-22774
Design 9813
Load Range C
31x10 50R 15LT

Front Right:
R-22774
Design: 9813
Load Range C
31x10 5or 15LT

Back Right:
R-22774
Design: 9813
31x10 5or 15LT

First off, I need to know what pressure to fill the tires to. They're low on air. The tires say something like "Maximum Load 2200lbs at 50psi COLD" -- is that what I fill them to, 50psi? My pump can't handle that and it won't fill that high, so can I drive to someplace with a pump to fill it? (I ask because it says COLD, meaning fill while cold?)

Second question, IS IT SAFE ONE TIRE IS SMALLER? I can't tell by looking, maybe I should get a tape measure. I never noticed it until I checked at the numbers.

  Jon_K

all your tires are the same size 31 tall 10 wide 15 inch rims(simple terms used)
the number your looking at maybe a production number or tracking like a serial number
as for air try to get up around 30 to 35 psi the drive to the service station and depending on temp of the tires top them up then recheck when cold

  osborste

also, air them up according to the data plate on the door... not the max pressure...

  dodger65

That's the problem. The tires obviously weren't the ones that came with the truck, and the sticker hasn't been updated.

  Jon_K

i filled my tires up. Since the tires say MAX 50 PSI COLD I put them to 45psi. I checked them and they all still say 45psi (although the weather is kind of warm, 94F).

Does this pressure amount sound good?

  Jon_K

if the original tire were 31x10's then you can still use the sticker in the door or check in the owners manual because the air psi is generally set for the wieght/load of the vehicle for best traction/tire wear
i had an 86 full-size bronco with 33's on it and only had 30-32 psi in them and they lasted 4 yrs with no abbnormal wear even with fords twin i-beam

  osborste

Can you reassure me that my suspension in my 93 ranger splash is in fact the twin i-beam?

  93ranger

Well, the vehicle is used and I just purchased it. I don't know how to determine the size the original tires for the truck were.

Here's a picture of the label on the drivers side if it can shed you any useful information to help me out. [edit] The old rims were 15x7jj, meaning that my new tires are bigger than the old ones, so if the stock 15x7 tires were meant for 32psi front, 35psi back -- what will the new 31x10 tires need do you think?
Picture of sticker: http://tinypic.com/9r59vr.jpg

  Jon_K

heres some pics of the two front suspensions note these are for 2wd not 4x4

  osborste

Damn I do have the I-Beam, oh well, time for independant swap :smoke:

  93ranger

What about my problems with calculating the new "suggested" psi for these larger tires then the ones that were stock? How'd they get these larger tires on there anyway, some sort of suspension raise?

  Jon_K

Look on the sidewall and do like 5 psi lower :2cents:

  93ranger

Oh really? So since my tires are larger than the cars original stock tires, I should have a lower PSI to compensate? Is this what your getting at?

Because if the PSI is at 30-40, the tires sag a little, and I'm concerned.

Stock inflation is about 30-35, and these larger tires which aren't stock have max psi of 50, meaning that I'd think they'd need more air to stay inflated then a smaller tire.
Thanks.

  Jon_K

your original tires were 235/75r15
your correct with the tire psi i would use this as a guide for the new tires as 32psi is to handle the load on the front tires and 35psi for the rears load
plus i now know we are looking at a 1994 chev/gmc truck and i think a 4.3L v6

  osborste

Okay, so go along with the guide of 32psi front, 35psi back according to the sticker despite the larger size? Thanks. I'll do that.

And your correct about the 4.3l v6

  Jon_K

My tires say 50 psi max cold, so I always fill up to 45 when cold. I need to though because with 40 series, bent rims happen.

  Nickboxer7

Yeah, thats a concern too. I haven't deflated them to 35 yet, but I need to. At 35psi they don't seem to be deflated enough to have problems bending the rims.

  Jon_K