I have hotchkis spring (F 0.5" R 0.75") and a set of 18" XXR rims.
The rim is Front 8.5 (245/40/18) +30 offset // Rear 9.5 (275/40/18) +25 offset.
As you can see in the picture, my rear rim can be flush with mb about 15 mm spacer or so. Do you think I can do this without fender rolling?
Does anyone has this setup??

 

You will need a roll if you want to be flush. no way around it.

 

Yes you can do it.

 

it probably a rule of thumb for the 350z if you drop and run aggressive offset, then get a roll

 

I don't think you will have any issues, I drove on Hotchkis springs for over a year on 18x10.5 +15 (8mm more outward than your rims with spacers) with 285/35 drag radial tires.

 

that's what I wanted to know - thanks for your input