How much backspacing do I need to correctly fit 33"x12.5"s on a yj?

also, just to clarify, I know that backspacing is like the offset, but what exactly does it measure? what is further out from the vehicle, a higher, or lower number?

I have never had to worry about this before, because last time i lifted a jeep, i already had rims and tires, so pardon me if it seems i am asking stupid questions. <img src="/forums/images/graemlins/kewl.gif" alt="" />

The offset of a wheel is the distance from the mounting surface of the wheel to the true centerline of the rim. A positive offset means the mounting surface of the wheel is positioned in front of the true centerline of the rim / tire assembly. This in effect brings the tire in to the fender well more. Conversely, a negative offset means the mounting surface of the wheel is behind the true centerline of the rim / tire assembly. This will cause the tire to stick out away from the vehicle.

Backspasing on the other hand is the distance from the mounting pad to the INSIDE of the rim..

Personally I do NOT know what you would need.
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

It really depends on what look you are after, if your rig is stock or modifided and how much...etc. Just about any 15" rim made for a jeep will be fine.

thanks Jim. that helped.

as for what look I want, my jeep isnt modified much. I just want rims to fit 33" tires with enough clearance, so my turning radius isn't affected.

Normal backspacing is 4.5 inches and you should be fine for 33's.

However, if you are considering modifications such as spring over and its accompanying steering mods, go for a 3.5 inch backspacing.

thanks KF6ZPL. thats the answer I was looking for.
spring over is a VERY possible future mod for me, so Ill probably go for 3.5"

If you are considering a spring-over, check out my article at:

http://www.4x4wire.com/index.php?op...mp;catid=41:jeepyj-cat&Itemid=54

Great write up John. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Only problem is what is up with the right hand margin? It covers up the last few letters on the right side of the article.

What browser are you using?

We have noted a few display quirks with IE 6 and older....

IE 7, FireFox, and Safari on a variety of OSs provide correct display.

Works fine for me. Im usin firefox.

Nice write up. Thats about how i plan on doing it, only I will probably make my own traction bar.

all in due time tho.