Recommendations for staggered tire setup 2011 G37 sedan with OE G35 Rays
 

I've been running 245/40/19's on both the front and back for a couple years now, but it's finally time to get new tires and I want to go with a staggered setup. I'm stock height, with my only suspension mod being larger sway bars. From my research it sounds like 225/45/19 and 255/40/19 might be a good, not to aggressive setup, but wanted to get some recommendations from the experts.

Also thinking about getting Continental ExtremeContact DW tires, anyone have experience with these?

I think the fronts need to be 225/35/19, don't quote me on that though

Your staggered Rays are
19" wheels
Front: 19x8 +30mm offset
Rear: 19x8.5" +33mm offset
Use the 245/40/19 as the baseline tire and go from there using this calculator
https://www.myg37.com/forums/tire_rim_calculator.php
You could run 235/40/19 front 265/35/19 rear OR
225/45/19 & 255/40/19 setups
The 225/255 stagger would be the best mount for those 8/8.5" rims but both setups will work OK w/ diameters close to 1% or less and will fit within the fenders OK.