I have a 2010 fx4 screw, with the 275/55/20 pirelli's, i want to get what i can out of them, before i switch out to bigger tires, I want to get wheels now, dont want to buy the wheels and tires at once. Will the stock tires fit on 20x9 xd monsters?? will the fact that they're wider than the factories affect much??

 

There will be a little difference but should work ok.

 

Your stock Pirelli's are horrible tires. I'd upgrade tires first.

 

yea they're junk but only will be til the beginning of summer.

 

I personally would just pull the pirellis and sell them or work a deal on them with a new set of tires at a tire shop. You should be able to get $3-400 as a trade for new tires. Thats my suggestion.

The Pirellis again will work, but will look pretty small with that leveling kit.

 

Great suggestion, i will look into trading up.. You have 33's, -12mm offset, I was told to go with -18 offset with 33-s, Im looking into 305/55/20's, can someone steer me in the right direction for rim offset? 2.5 level kit is what ill be using.

 

yeah get rid of the pirelli's A.S.A.P!!!!!! They are junk

 

You mean +18mm offset... a 9" wheel would then have a 5.71" Backspacing.

With my aftermarket rims, the specs are -12mm OS (4.5" BS) there is a lot of poke or tire sticking outside the wheel well.

offset is the distance from center of the wheel to the location where the wheel mounts to the hub measured in millimeters (mm). Directly in the center would be 0mm. motion to the inside to the back edge of wheel is negative, motion to the front side is positive.
Negative make wheel stick out more, positive tucks wheel in more.

Backspacing is the distance from the mounting surface to the back edge of the wheel measured in inches. The relation of offset to backspacing will change with wheel width.

I find, that negative offsets are better suited for lifted trucks and neutral or just + offsets are better for leveled trucks <<< between 5.25 and 5.75" of backspacing.

Most F150 owners go to a 9" wheel. Best size for a a 11.5 to 12.5" tire.