I have some 20x8.5 rims, and 275/55/20 tires picked out for my '05 XLT 4x2. The wheels however have a 30mm offset and 5.9" of backspacing. While I know that the positive backspacing will make the wheel set in the fender well more (I think), what im worried about is will in set the wheel in too much. I plan on putting a 2" lowering shackles on the rear to level out the truck at the same time as the new rims and tires, if that makes a difference. As much as i read about backspacing and offset I cant seem to wrap my mind around it. Please any info will be helpful.

1)How much will they be set in compared to factory?
2)How much backspacing would look good in my specific application?
3)Will I have to worry about fender or bumper rubbing at a certain amount of backspacing?

 

Someone might want to check my math:

Your wheel/tire setup will equate to:
I am running a tire/wheel setup that equates to:
So to answer your questions:

1.) Not sure about factory spacing and offset.
2.) You can look at my gallery and see what it looks like on mine. Your setup wont be "too" much different in size.
3.) I dont think you will have issues with tire run. I am running at stock 4x2 height and I have 0 rubbing.

Also, I should be able to do a 2/4 drop without rubbing so drop shackles shouldnt be an issue on your truck with your selection in tires/wheels.

 

Thanks. I looked at youre gallery and youre truck looks awesome. The way Im reading youre data my rims and tires would stick out a little less than youres, is that right? If I am right that would be great, because once again youre truck looks sweet. Let me know if thats the case.