what width rim should i run with 12.5 inch wide tires? I just read that need to be 8.5 or wider but, i thought they could be 8 inch wide?

 

i run 10 inch wide rims for my 35x12.5 's w/ a medium offset.

 

8s would be fine a lot run those 10s would be ok to but you run the risk of blowing a bead aired down.

 

7-8" rim i would run.

 

12.50's recommend a 10" wide wheel. IIRC

what does it say on the side of your tire?

 

you risk blowing the bead more with a 8 inch wide wheel?

 

No you risk blowing the bead more with a 10 inch wheel.

 

the 8 and 10" rim dilemma faces a few people. If you are talking about the '95 Runner in your avatar, I would go with the 8" wide rims. Not sure what lift you are running.
I have run both sizes on various trucks over the years.
Granted these pictures are of my '81, 8" wide rims with 3" BS, The lower pictures are with 1.5" spacers but I think it might give you an idea of how far the tire might stick out on your truck with a 10" Rim.
Before spacers:

After 1.5" spacers:



In some areas having your tire stick out that far is illegal and some cops like to get guys for it.

It all comes down to backspacing in my opinion...10" wide rims give you more stability but also increase wear on wheel bearings due to the increased unsprung weight....

 

i didn't realize that with 10" wide rims.

yeah if your tires stick out too far in some place's cops can give you a ticket or even a vehicle inspection notice. you might want to get flare's.

 

on my street set i run 10" wheels with my 33x12.5 tires and have never had a problem. for my wheelin set (that i sold), i had same size tires on an 8" rim. not sure why really

 

I run 10" rims with my 33's BFG all Terrains.

 

A 8-10" wide rim will work great with 12.50" wide tires. Mine is right around 8.5" wide.

 

so will any certain size width make the stanc wider or skinnier or is that just backspacing?

 

Wider tires will make it stick out more but the back spacing really effects it the most.

I'm running 12.50 on a 10" rim. I've never had a bead blow, but I have had problems with the tires spinning on the rim. For years I wondered why my tires wouldn't stay balanced. Then I decided to mark the valve stem location on the tire and found they slowly creep on the rims as I was wheeling (aired down to about 12 psi).



I have now done the poorman's beadlock mod and only air down to 17-18 psi and that has stopped the slipping.

 

I have 8 inch rims for my 12.5 wides......can air down to 3 or 4 pounds of pressure and I've never lost a bead

 

I thought about running 35x12.50's on a 15x7 I wonder how they would look....

 

x2!!! I run 8s on my Cooper STT 33x12.5's for that exact reason. Plus thinner wheels are less exspensive

 

anyone run a 15" wide tire on a 8.5" rim or do you think that would be tooo skinny. i have some 2" spacers i can use if i need so backspacing is not a problem.

 

id go with a 10" wide rim for a 15" wide tire


im going with 325/85 xmls (38.5/13 - 16) and 16 x 8 4.5" bs, with 1.5" spacers.

may throw on my ifs hubs as well

 

I have a full discussion of how tire and wheel width as well as backspacing affect track width on the web page below:
- http://www.4crawler.com/Diesel/Tires...ningTrackWidth