Backspacing of stock rim?

[The Adam Blaster]

I need to know the stock backspacing for the rims on a '98.
Theh info i've learned so far is that they are 15"x7", 5 on 4.5" bolt pattern, and the center bore hole is 71.5 mm in diameter.

But, still no idea on what the backspacing is...

My plan is to go up to a 8" rim, and an 11.5" wide (maybe 12.5") tire, but i want the rims to push the tires out quite a bit farther so i lose this annoying rubbing on the lower control arms.
Right now i've got 10.5" wide tires, and they rub at about 85% of full lock.

Anyways, i'd go measure my own rims, but they all have tires mounted on them making it harder to get an accurate measurement.

[Menzenski]

Stock rims are 5.25" backspacing.

[ILLXJ]

Stock BS is 5.25". Seems most people running 12.5" tires are running 4-4.5" of BS. HTH. JIM.

[ILLXJ]

Stock rims are 5.25" backspacing.
Couldn't have beat me by more than 30sec. JIM.

[The Adam Blaster]

Cool, thanks guys.
If i went to a 10" rim and 4.5" BS, i'd be set, that's good to hear. Rims will be easier and cheaper without a custom BS. :D

[ILLXJ]

Most people running up to a 12.5" tire are running 8" rims. JIM.

[The Adam Blaster]

Actually, i just got a new job at tire warehouse/distributor and i can get some Interco LTB's in 31x11.5" for around $125.00 each.
I can also get some wagon-wheel style basic black rims in 15x8" for real cheap as well.
I'll get the rims with 3.75" BS so even with the wider tires, i'll still have a full inch more space on the inside of the wheel well. That should work out really well.
And i'll have a lot more grip than the current slightly worn BFG M/T's. :D