Alright so I plan on doing a level on my 07 FX4 and stuffing some 35/12.5/17 Toyos under there. These tires are about 80% tread so they aren't a full 35" tall.

Now my question. Currently there are only 2 rims that I would like to use.

First is the 2012 machined black Raptor rims.




second are Ultra Mavericks.
http://www.ultrawheel.com/ultra-whee...id=49&cat=1140

I don't fully understand B.S. and Offset. So i'm asking for your help.
Which one of theses would stick out further.

From what I know the Raptor rims have 6" backspacing and the Ultras have 5.5" of B.S. and +25 offset. So would the Raptors stick out a tad farther.

 

Raptor rims are 17x8.5 +34mm offset and 6" B.S.

Ultras are 17x8 +25 Offset and what I believe 5.5" B.S.

 

If that is correct, both wheels will "stick out" the same amount.

 

Thank you!! I believe it's correct. It's what I found on the website.

What are they compared to stock 18" 07 FX4 wheels?

 

Our OEM 18" wheels have been said to be about +44 offset.

 

Ya i remember reading that, but wasn't certain how that compared to either of the rims I posted.

I do remember reading something along the lines the less the offset the further it sticks out. How true is that?

 

Offset is a way to help determine backspacing. Backspacing is the measure of the distance from the back of the mounting surface of the wheel to the back edge of the wheel. Higher the number the more "tucked-in" that wheel is, the lower the number, the more "stick-out" the wheel gives. Offset is the measure of the distance (in millimeters instead of inches) from the center of the wheel width to the back of the mounting surface. So a zero would be if the mounting surface was right in the center of the wheel width. If its a negative number that means the mounting surface is moving toward the rear of the wheel, resulting in a smaller backspacing measurement (more stick-out). If its a positive number, that means the mounting surface is moving toward the front of the wheel, resulting in a larger backspacing measurement (more tuck-in).

Now as Wandell eluded to, you can't just compare those measurements across 2 wheels. You also have to take into account the wheel width as well. Thats why he said the 8.5" wheel with a 6" backspacing would sit the same as the 8" wheel with 5.5" backspacing. On the 8.5" wheel you have 2.5" of wheel in front of the mounting surface (8.5" width minus 6" backspacing). On the 8" wheel you also have 2.5" of wheel in front of the mounting surface (8" width minus 5.5" backspacing).

Hope that clears things up a bit.

 

That does!! Thank you very much.
I know a lot of things about these trucks, but when it comes to wheels I'm just clueless. I really appreciate everyone taking there time to help me out .

 

Glad to help!

 

So just to double check the stock 18x 7.5 has a back spacing of 5.5 (2.0" from mounting surface) and both of these rims I'm looking at are 2.5" from mounting surface. Both rims will be .5" farther from mounting surface than stock.

 

Assuming those measurements are correct on the stock wheel, then yes, either of the new wheels will stick out 0.5" further than stock. You'll also notice with the wider wheels (more-so with the 8.5") that your tires will look a little "beefier" in a good way.

 

Alright, once again thank you very much.

 

Russ nailed that.

And btw, OEM Raptors all the way, Brad! They look great on Johnboy88's Ecoboost, and he has similar or the same two-tone colors.

 

It's a hard decision. I can't really justify the price tag on them used. I can get those Ultras a lot cheaper new.