MBWorld.org Forums - Help with ideal offset

I'm in the process of changing the rims and tires on my wife's 2014 GLK250. I've narrow my tire/rim combination down to 18" x 8" Hartmann Peelers and 235/55/18 Pirelli Scorpion Verde.

My question has to do with rim offset because with the Hartmann's I have some options. I know with GLK OEM rims have a 45mm offset. I would like to bring the new rims out and fill the well but not to the point of inner fender rubbing under suspension travel.

Does any know (in your opinion) the ideal offset to accomplish this without the possibility of rubbing.

Thanks