staggered setups need to be within .5% total diameter of the wheels
you cant run 18's and 19's
but you can 18x8 and 18x9
http://www.1010tires.com/TireSizeCalculator.asp

use that to help

I am a member but for some reason the forum will not allow me to post. It says the admin has not approved yet???

Ok i need some more clarification on this??? I will be runnin 20 x 8.5 and 20 x 10 and the tires will be 245/30/20 and 285/25/20 will this work? Also the offsets for these wheels are 25 mm and 40mm...which offsets do i go with?

Ok with the 245/30/20 and 285/25/20 setup im runnin a diameter difference of .66% so i guess this will work?
Now as stated above is it .5% or 5%? Clarify please

up front 225/40
in back 255/35

you arent going to pull this off without some stretch

no chance in hell you are getting 285's out back

here is a read for you
http://audizine.com/forum/showthread.php?t=123289

So rep for a wheel shop told me to put those 285's in. I guess hes wrong.

So ur saying the 225/40 and 255/35 is my best bet? I cant go to a smaller profile? And what about the offsets I mentioned?

did you click the link in your email?

I just registered agian under a new name and clinked the link. Thanks!