So I have a g37xs sedan on tenabe springs. Going to purchase avant garde m510 wheels and going to go staggered set up. What kind of offsets are reasonable and what tire size should I be looking for?

 

Are you going with 19", 20", or 21"? What is your desired wheel AND tire width? Are you planning to run low profile tires? Are you okay with stretched tire look?

 

The best two tire sets would be 235/35/20 & 275/30/20 OR
245/35/20 & 285/30/20 Both will give you virtually no diameter variance front to back.
If you go w/ 19s 245/40/19 & 285/35/19 is the best size.

As far as offsets, a 8.5x20 +40 front and 10" +45 rear will work, same offsets & widths if you go 19s too.
Brad