hi guys i have a 2009 G37 Sedan stock height currently.
i am looking to upgrade to 20" stern wheels. I am looking at Stern Jockface
20x8.5 front & 20x9.5 rears. I wanted to know what is the correct offset that will work? i am also looking to do a minor drop maybe 1" in the future. Also what Tire size would be recommended for this set up? Please help trying to order the wheels this week late Christmas Gift.

 

I believe the stock off set is +35 all around. You need to find out the offset those wheels are

 

Jock Face
Front 20x8.5 offset 20
rear 20x9.5 offset 25

Touring Sport
Front 20x8,5 offset 20
rear 20x9.5 offset 25

thank you

 

Those are coupe offsets unless you really want to stretch your tires.
My 20s are 20x8.5 +40 front 20X10 +45 rear and I'm 2mm from flush at the rear and about 7mm in on the front. Tires are 245/35/20
& 295/30/20

Those offsets you listed will have your rims poking out from the fenders a bit unless you're slammed.

 

i seen some 19" 19x9.5 w/ offset 48 & 19x8.5 offset 45 how would these fit? thank you

 

Those would be better sedan offsets, be careful if you happen to have an S model as you'll need to make sure they'll clear the larger Akebono calipers.