How exactly do you figure out thebackspacing, and to see if the wheels are too wide?
I'm not for sure what size mine are but they seem awfully wide

Either look up the specs or measure them.

and how do you measure them? Im not trying to be a smartass, i just didnt know if there was an easy way or not.

Width is measured inside the bead, so a 10" wide wheel will actually measure about 11" from outer edge to edge. Backspace is measured from the back edge to the hub surface on the back side.

i have 35x12.5 mt tires currently leveled truck and using stock rims with 1.5" wheel spacer. i defiantly want to remove the wheel spacer and plan on lifting the truck 4" in the future, i read the whole post and cant figure out if i need a -25mm offset or what. im not worried about how far it sticks out just as long as it doesn't rub on the springs

For a 2000 with 35x12.50, a -6mm offset will put it right even with the fender. -12mm will be about 1/4-3/8" outside, -25mm will stick out about 3/4". All will clear the springs/frame, the -6mm will be pretty close. If you want room for tire chains, go with at least -12mm, preferably -20 to -25mm.

thanks for the help, ive been trying to figure out this for weeks. now its gonna take me weeks to figure out which rims i like the most haha

one more question. does the wheel need to be hub-centric?

Most aftermarket wheels are not hub-centric, so I wouldn't worry about it. There are a few, but they are mostly the real high-end forged wheels that are very costly.

Hi guys just like to give you an update, I got my lift and tires done.
4'' procomp suspension, with dual steering stabilizers.
325x60x20 duratracs on 20'' american eagle wheels.

HELP.......
 

Hey Guys.... I have a good question for everyone and hopefully someone can help.... lol... O.K. I have a 2001 f250 4wd... I just installed a Zone offroad leveling kit on the front and now my truck is sitting 1" to 1.5" higher in the front than the back???? I am puzzled honestly.... How do I need to fix this problem???? maybe block the rear to match the front??... O.K. The next question is tire size... I want to go with a 17x9 wheel, but I have no idea of the offset or backspacing??? I will say that I want to go with a 33" or 34" mud terrain tire.... However I do NOT want my wheels sticking out anymore than a 1" at best.... Can anyone help me with these problems??:-huh

You need a 4" block in the back, leveling kits are designed for F350s and your F250 has only a 2" block. For wheels, you'll want 0 to -12mm offset, depending on your tire width.

O.K. So you are saying that my f250 has a 2" block in the rear now and that I need to change it to a 4" block correct?? O.K. I GOT THAT PART THANKS!!! Now on the wheel size you are saying anything from a 0' offset to a 12mm offset?? what would you recommend as far as width for a 33" tire?? Like I said I want to go with a 17x9 wheel, but I want them to be almost flush with the outside of the fender or no more than a 1" outside the fender that way I can put fender flares on to cover them... you think a 295/70/17? or a 305 or 315???:-huh

0 to -12mm offset is what I meant. With a 33x12.50 tire, a -12 will put you just outside the fender. To get 1" out you'll need a -25mm wheel. If you go narrower like a 295 then it won't quite stick out as far.

Ok,,, Thanks for the info.... I have installed the 4" blocks in the rear, it worked great!! Now that I have the truck sitting level.... I think I am going to keep the factory wheels for now, so my next question is can I run a 295/75/16 on a 16x7 factory wheel without anything rubbing? Now that I have a 2" lift all the way around, I am thinking I should be ok... Just want to make sure!!