I have a 2006 F150 Lariat 4X4 I'm adding a 3 inch steel spacer in the front. I have found a Eagle alloy wheel that says has a +25 offset. I'm wondering what is the biggest tire I will be able to fit. Also with a 3 inch spacer would it look weird with a add a leaf on the rear.

 

Don't get a 3" spacer! That's a bad idea. At the most go with 2.5" or better yet 2".

 

lol question is asked on a daily basis. dont do a 3 inch, go with 2.5 or 2 like said above. a 33x12.5 will fit no problem.

 

And the offset of the wheel is useless without knowing the width. But a 33x12.50 will fit fine unless you are talking about a really wide wheel.

 

Ok What is the problem with the 3 inch spacer and to late I have them and they are installed and the Wheels is +25 offset 9" Width and my buddy said I would need like a 13 offset or 8 or something like that to run a 315 tire

 

Im think with this kit 315X10.50X20

 

Alright if I'm reading your post correctly you already installed them (hard to read with no punctuation), so I hope your ready to start replacing cv axles, ball joints, and tie rod ends a lot more than normal.

And a 315 what? Your missing two numbers..

Do you mean a 35x10.50r20?

 

With a leveling kit and a 9 inch wide wheel with +25mm offset (6 inches of backspacing), you can easily fit a 33x12.50 tire. I believe you would have some serious rubbing if you went with a 35x12.50 tire.
And members here discovered years ago that a 3 inch leveling kit/spacer leaves the ball joints and CV joints (on 4x4's) at too severe of an angle to last.

 

This