Whats the width of the wheel? I'm assuming 8 or 8.5"? If so it will work on a 99

 

17"x8.5"

 

Then yes they'll work

 

It's how big your lip will be, if your rims have a lip, thats a good way to think about it

 

Offset is how far the mounting face is off the center line of the wheel.

I.E. Say your wheel is 8" wide. Backspacing will be 4" with 0 offset. The mount face is directly centerline with the wheel width. If you had negative offset the wheel moves in towards the axle. Positive offset pushes it out away from the axle.

 

wouldnt a negative offset (moving mounting face towards the back of the wheel) make the wheel push out away from the axle? if im wrong please correct me or if thats what you meant and i read it wrong sorry.

 

Post #8 in my library explains it, and has pics too.

TANKS Library - Powerstroke Nation



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That helps alot. So a I bought five 8-1/2" wheels with 4-1/2" backspace with a -6 offset. Now I understand the offset but what does the 6 represent as far as a measurement.

 

-6MM so like -.25".

 

Thanks so the offset is in mm. Thanks for all your help. Picked up five weld cheyenne 8's 17"x8-1/2" for $600. Really wanted some 18" wheels but these will do for now. When I get some more money I'll get the Icon lift. Damn rain just screws up the construction schedule.

 

There is some industry confusion as to what positive and negative offset refer to. Generally speaking, and the most common accepted definition is that negative offset will move the mounting face of the wheel towards the inside of the wheel. So yes, I agree with you bigjake, that it will move the wheel away from the axle.

 

If ya click on the link I put in...it will explain it for you.