hey i am looking to put some rims on my truck ,04 4x4 fx4 5.4l . just wondering excatly what all this backspacing and offset is about ... also what would the stock rims be ... i know their 18s with 275 60 tires but as far as width and everything else . little help would be appreciated

 

Factory 18 rims are 7.5" wide with a bolt pattern of 6x135. As far as backspacing and offset that is the measurements based from the center of the wheel in and out. Not going into details, do some searching on here or google and you will find explanations with pics etc.