I have 17" rims for my 1995 TT.The fronts are 17"7.5-30deg offset-the rears are 17"8-33deg offset. What size tires can I run? Thanks for the help.

 

Most manufacturers will have information about what range wheel widths their tires work with. If you want maximum stretch on a 7.5" rim, get tires with a range maximum of 7.5". If you want maximum bulge, get tires with a range minimum of 7.5".

Here's a good writeup with more info about wheels and tires you'll probably find useful:
Wheel Fitment and Tire Size Guide : 300ZX (Z32) General

 

Thanks ,I will go with the 245/40/17 and the 235/40

 

Just so you know that's going to be quite bulged.