Originally Posted by javol
A very aggressive setup could be 19x9.5 front (your rears on the front of the Z) and 19x11 rear. It depends on offset values and suspensions (ARE YOU ON COILOVER?). Offset values for this setup: Front 28-30 / Rear 35-37. These are the exact offsets limits to avoid inner rubbing and sticking out from the fenders. With some spacers you can match them perfectly, if you need.
Otherwise go with a more conservative 19x8.5 front (ET around 25-30) and 19x10 rear (ET around 35-40).
What do you think of this set up
18 by 9.5 et 25
18 by 10 et 40