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Thanks To DiscountTireDirect:
The below offset specs are "conservative" We have acheived max fitments well beyond these specs, but below is for those of you who play it safe. When going to the edge...be sure to call to discuss it more throughly.
ALLIGNMENT PIN ON FRONT HUB CAN BE REMOVED, PIN IS
TRACK MODEL IS EQUIPPED WITH BREMBO BRAKES WHICH
LIMITS THE AMMOUNT OF WHEELS THAT WILL FIT!!!!
WIDTH OFFSET WIDTH OF TIRE
7.0 +5/+50 215/225
7.5 +11/+50 215/225/235
8.0 +18/+47 225/235/245
8.5 +20/+40 235/245
9.0 +22/+35 245
Rear Only
8.0 +7/+50 225/235
8.5 +13/+50 235/245/255
9.0 +19/+47 245/255/265
9.5 +20/+40 255/265/275
10.0 +22/+35 265/275
18 INCH WHEELS COME WITH A TIRE PRESSURE MONITOR TIRE SIZE CONNECTED TO O.E. VALVE STEM. NO LESS THAN 1/2 INCH AND NO MORE THAN 3/4 OF AN INCH HEIGHT DIFFERANCE BETWEEN FRONT AND REAR TIRE SIZE FOR ABS BRAKE SYSTEM/TRACTION CONTROL. 350Z'S WITH 18-INCH WHEELS HAVE A AIR MONITORING SYSTEM. THE SENSOR IS MOUNTED AT THE BASE OF THE VALVE STEM AIR PRESSURE SENSORS ARE A ONE PIECE UNIT AND CANNOT BE USED WITH REVERSE BARREL WHEELS
Wheel Offsets
The offset of a wheel is what locates the tire and wheel assembly in relation to the suspension. More specifically, it is the measured distance between the hub mounting surface and the center line of the rim. Below is an explanation of the various types of offsets which are pictured in the above graphic.
Positive Offset
A positive offset occurs when the hub mounting surface is on the street side (the side you see) of the center line of the rim. Most factory rims will have this type of offset.
Zero Offset
When the hub mounting surface is centered within the rim, it is known as a zero offset.
Negative Offset
If the hub mounting surface is on the brake side of the center line of the rim, it is considered a negative offset or deep dish.
Note that extensive negative offset can potentially cause increased steering wheel kick-back and place additional stresses on the vehicle's entire suspension.
The below offset specs are "conservative" We have acheived max fitments well beyond these specs, but below is for those of you who play it safe. When going to the edge...be sure to call to discuss it more throughly.
ALLIGNMENT PIN ON FRONT HUB CAN BE REMOVED, PIN IS
TRACK MODEL IS EQUIPPED WITH BREMBO BRAKES WHICH
LIMITS THE AMMOUNT OF WHEELS THAT WILL FIT!!!!
WIDTH OFFSET WIDTH OF TIRE
7.0 +5/+50 215/225
7.5 +11/+50 215/225/235
8.0 +18/+47 225/235/245
8.5 +20/+40 235/245
9.0 +22/+35 245
Rear Only
8.0 +7/+50 225/235
8.5 +13/+50 235/245/255
9.0 +19/+47 245/255/265
9.5 +20/+40 255/265/275
10.0 +22/+35 265/275
18 INCH WHEELS COME WITH A TIRE PRESSURE MONITOR TIRE SIZE CONNECTED TO O.E. VALVE STEM. NO LESS THAN 1/2 INCH AND NO MORE THAN 3/4 OF AN INCH HEIGHT DIFFERANCE BETWEEN FRONT AND REAR TIRE SIZE FOR ABS BRAKE SYSTEM/TRACTION CONTROL. 350Z'S WITH 18-INCH WHEELS HAVE A AIR MONITORING SYSTEM. THE SENSOR IS MOUNTED AT THE BASE OF THE VALVE STEM AIR PRESSURE SENSORS ARE A ONE PIECE UNIT AND CANNOT BE USED WITH REVERSE BARREL WHEELS
Wheel Offsets

The offset of a wheel is what locates the tire and wheel assembly in relation to the suspension. More specifically, it is the measured distance between the hub mounting surface and the center line of the rim. Below is an explanation of the various types of offsets which are pictured in the above graphic.
Positive Offset
A positive offset occurs when the hub mounting surface is on the street side (the side you see) of the center line of the rim. Most factory rims will have this type of offset.
Zero Offset
When the hub mounting surface is centered within the rim, it is known as a zero offset.
Negative Offset
If the hub mounting surface is on the brake side of the center line of the rim, it is considered a negative offset or deep dish.

Note that extensive negative offset can potentially cause increased steering wheel kick-back and place additional stresses on the vehicle's entire suspension.