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OK, I am looking at going to 40 inch tires and I am running into a small issue. I have 18 inch rims and when you go from 37/38 inch up to 40 inch, most of the brands go from 12.5/13.5 inches wide to 15.5 inches wide.

The ultimate question - Will they fit?


6 inch Teraflex lift
Currie Dana 60's front and rear
Spiderlock rims with 3.5" backspacing
 

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Depends on the offset of your wheels

I'm running 14.50 wide on 4.5bs and have no issues


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The rims I have are 3.5 inches of backspacing.
Highly doubtful that you can get much useful answers on that one unless someone runs a nearly identical set-up as you have. Things tend to have been shifted around when rather large tires are fitted :)
 

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Is your rear axle stock length or as wide as the front? It would be close up front but may work, the rear with a stock length axle might be tight
I think stock is 66 an widened is 69
 

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I don't wanna say for sure either way, you could weigh the cost of selling your wheels and picking up a set in 17 and the cheaper cost of 17inch tires or running spacers with your current setup
I know iroks come in 41x14r18
Those would be pretty sexy
Or a 38.5x1350r18 pitbull maddog
 
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