How do you determine "ride height" to make suspension mods??

Revhendo said
Lots of good info here. I even like the MDF idea. If you are looking at buying Bullit wheels and then having them widened, why not just get American TT's with custom backspace? Could be close costwise. Like I mentioned earlier, check to see what the backspacing range is on the wheels you want. Example, if you decide that you need a 4.75" bs and all you can get is up to a 4.5", you are going to have to rethink the setup.
(Don't ask me how I know....)

I already checked and American TT M's don't come in 18x12 either -- So regardless I am stuck with either widening the Bullit wheels or the American TT M's to get them to the 18x12 that I need. Since I have to widen them I can have the wheel shop set the back spacing at what ever I want. I am also waiting to hear back from COY's on a custom set of C-5's --- Figure by the time I buy rims, have them widened, then have the refinished to look right, I am going to have some coin in the rims so I am just trying to work out the most cost effective way of doing them.