Originally Posted by Red__Zed

What widths do you want? I can help once we have that down.


I can also explain...If you teach a man to fish, right?

I'm going to assume you aren't doing anything truly crazy, which means we can ignore the inner clearance and just worry about the outer clearance, which will make things a little bit easier.


To start, let's look at the stock 18" rim sizes:

F: 8" ; +43mm
R: 9" ; +15mm

So our outside width for the stock rims is:

F: = 4" - 43mm = 5.86cm
R: = 4.5" - 15mm = 9.93cm

Of course, stock rims aren't very aggressive, and most people want something that pushes them out a bit more.

25mm spacer front and rear gives us something like this:


F: = 4" - 18mm = 8.36cm
R: = 4.5" +10mm = 10.43cm

And a more aggressive 9.5/15 (this may actually rub) || 10.5/5 gives us:


F: = 4.75 - 15mm = 10.565cm
R: = 5.25 - 5mm = 12.835cm


The long and the short of this is that what offset you need is going to vary dramatically based on the width of the wheel you need, and the look you want.

Something aggressive might be in the range of:
F: 9.5" , +18
R: 10.5, +5


If you want to stay with stock widths and keep the offsets, you have those numbers. If you want to space them out more, just subtract out how much extra spacing you want* (ie, 25mm spacer takes the front to a +18 and the rear to a -10).

These numbers should give you an idea how various offsets will sit