Offset for rims

[4x4Dalton]

Ok yall this has been messin with my head for a while now. And with the XJ guru's we have here I know they can explain it to me and others that wonder about it as well. What exactly is offset for runnin wider tires mean and what is to wide a tire to run? Any info will be greatly appreciated. Thanks yall.
Bear

[hookedonxjs]

I know this dalton that on a 8" wide rim you need 4.5" -4.75" back spacing in order to run 32" tires without the tires rubbing the control arms I don't know what the criteria is for say 35" but I'm sure that it's relevent to avoid the control arms from rubbing as well. As you increase the width you will also need to increase the back spacing to allow for wider tires. As in the case of most after market rim companies as the width of the rim increases so dose the back spacing increases as well. If you go with steel after market it's almost hard to find a rim that dosen't have proper back spacing with a jeep lug pattern. Don't know if that's gonna answer your question or not but I'm sure there's a chart somewhere on line.

[Firemanray]

I'm running 10" wide wheels with 4" backspacing wrapped with 33x12.50x15 swampers. Here is a picture of the same wheels with 31" BFG A/T's on them:
http://i223.photobucket.com/albums/dd11/firemanray21/BigJeep.jpg

Also here is a link for some wheel "education":https://www.rsracing.com/tech-wheel.html




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[bigjim350]

Most folks who run aftermarket rims and tires 12.50 wide and smaller run 15x8 with a 4" backspace with no probs. That's what I'm using, which gives plenty of control arm clearance with out sticking out too far.

[cantab27]

how do you measure the rims to see what offset they are...flat edge across rim then mesure down to centre where lugs go..?????

[Firemanray]

How to Measure Wheel BackSpace
Items required to measure wheel backspace: Tape measure
Straight edge
Wheel w/o tire (preferred)

The easiest way to measure backspace is to lay the wheel face down onto the ground so the backside of the wheel is facing up. Take a straight edge and lay it diagonally across the inboard flange of the wheel. Take a tape measure and measure the distance from where the straight edge contacts the inboard flange to the hub mounting pad of the wheel. This measurement is backspace.

[cantab27]

thanks ray

[hookedonxjs]

I'm running 10" wide wheels with 4" backspacing wrapped with 33x12.50x15 swampers. Here is a picture of the same wheels with 31" BFG A/T's on them:
http://i223.photobucket.com/albums/dd11/firemanray21/BigJeep.jpg

Also here is a link for some wheel "education":https://www.rsracing.com/tech-wheel.html

Ray can you drive on the beach in Texas?



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[bigjim350]

Yep you can drive on tx beaches, thanks to the tx open beaches act. Our beaches are considered a st hwy though, so all traffic laws must be obeyed.

[4x4Dalton]

Some good info yall thanks.

[cantab27]

im sorry but i cant have a post with just a red jeep in it..:rolleye0012:
33x12.5r15 on 8 inch rims with kiwi -24 offset, which i think is about 4 inches , may be wrong.....:D
http://i469.photobucket.com/albums/rr52/cantab27/jeepin%20and%20bits/Picture052.jpg

[LizardRunner]

Back space is from inside of the rim to the center section. Off set is from the outside of the rim to the center section. These are different measurements to get to the same place. to much backspace will create wheel bind on suspension parts while to much offset will create a wheel collapse scenario.
http://www.xjtalk.com/picture.php?albumid=232&pictureid=1971 http://www.xjtalk.com/picture.php?albumid=232&pictureid=1974

Hope this helps everyone.