Max Tire and Spacer size for Cup One Wheels

[Jaggi]

I have a set of Cup One Wheels for my 1991 narrow body 964 Carrera C4 and would like to know what the maximum tire size and spacer thickness I can use. The Cup One's are 7" and 8" x 17'
Thanks

[Newsboy]

I have 225/45/17 tires on 7" wheels in the front of my 964, with 5MM spacers, and 255/40/17's on the rear with 9" rims. You can check which tires will fit at Tire Rack website.