My car that Frank is laying the clear on this week is running the 19/18 stagger with the 345/30/19 27.4" and 255/40/18 26". There were a few reasons I decided on this setup. When I ordered the wheels it was a pretty new deal, I wanted to keep the sidewalls as uniform as possible, and the vette and viper both staggered 19/18 at the time. I went with a coil over set up in the rear to get the car at the proper ride height. You can figure out your sidewall heights by multiplying the apect ratio times the width. 345 x .3 =103.5 255 x .4=102 This gives you a slightly larger sidewall int he rear. I hope to see the photos on my car soon! It's been almost a year since I bought those wheels.
Unfortunately they sat around my previous builders shop and collected dust for a while.