I'm sure this has been asked 1 million times. My FX2 came with these large fender flairs on it and it looks a little funny especially from the front. I'm thinking of putting a 2" or 2 1/2" leveling kit on the truck. My question is what back spacing will allow the rim stick out 1" from the factory fender. I will probably stick with a 20" wheel or maybe a 22 at max. I'm thinking of a 33" tire with this setup. I also do not want to cut anything if possible.

Thank you,

 

You probably need about 2" more, at least, than what you have now.
Remove your wheel and look for the offset stamped on the inside of the wheel.
Use the wheel calculator and input your wheel width and offset for the wheel then use the comparison section and use a rim width of your choice and change the offset.
https://www.willtheyfit.com/index.ph...-5&offset2=-20

You may need to get into the negatives to poke that far.

Sorry to post a link but there is no answer to your question as the backspace/offset is different for every rim width to make the stance the same between different width wheels.

 

I have 20x10 rims with a -25mm offset with 305/55/r20 Ridge graps. That offset has me about 2 inches outside the factory fender. Don't worry too much about backspacing as it moves in relative direction to the width of the rim and offset, also it will be much easier to find rims this way.

Go to the pictures at custom offsets and enter the specs of your truck, from there you can see all the different size rims, tires, and offset people have ran and it lists their modifications to get them not to rub. My guess would be somewhere between a -12 mm and a -25mm offset is what you would be looking for given that its on a 10 inch wide rim.

Hope this helps.

 

I will also suggest a -18 to -25 wheels that is 10" wide