I have an 06 Supercrew 4x4 with a 4" Rancho lift. It currently has 33x12.50 tires and I am going to upgrade to new 20" wheels and 35x12.50 tires. The wheels I am considering come either with 5.0" or 5.79" backspacing. I am sure the 5.79" will work fine with no rubbing, but not sure about the 5.0". Any feedback from personal experience would be appreciated.

 

Do you want the tires to stick out as far as possible? If not I'd go with the 5.79". For the 5" it will probably depend on what tires you get as they seem to range from 11.5" wide to 13"+.

 

How wide are the 20's?

 

I'm looking at getting Mickey Thompson ATZ's which have a 12.5" section width. I'm probably going to end up going with the 5.79" backspace wheel.

 

I thank they are gonna rub on the frame with a 5.79 wheel , you better get the 5......

 

The wheels I have now have 6.18" of backspace and the 33's don't rub the frame, so i'm sure the 5.79" won't.

 

Is anyone running a 9 inch wheel with 5" of backspace or less and 35x12.50s with a Rancho lift?

 

many people running 35x12.50 on factory 20s with the 4 inch rancho and factory 20s are about 6" backspacing. The rancho kit was desighned to be able to use factory wheels. So with 5.79 you will definatly be OK.

i think wandell was asking how wide the rims are, not the tires.

 

This same question was asked less than a week ago. But...
You need to answer Wandell's question above first: How wide are your 20's? You need to remember that backspace is relative to rim width (ie. 5.79" of backspace on a 8" wide rim means something different if the same backspace is on a 10" rim).

Check out this thread: https://www.f150online.com/forums/su...ncho-lift.html

 

The wheels are both 20x9.

 

Both wheels will work/fit fine. It just depends on how far you want your wheels to stick out. A 9 inch wheel with 5 inches of BS will stick out 2 inches farther than your OEM wheels while 5.79 inches of BS will stick out about 1 1/4 inches farther than the stock wheels.