Tire Questions???

[GTVertY2K]

I have a 2000 convertible GT that has H&R Sport Spings (1.5" drop front, 1.25" drop rear) and am currently running Falken 255/40/17's on AFS 17 x 9 Chrome '03 Cobra replicas with 26mm offset. My questions are;

1) Can I go to a 255/45 without rubbing in the front?
2) Can I go to a 265/45 or 275/40 without rubbing?

Thanks

 

[TL1000S]

I have a 2003 GT with steeda springs and I am running 275/40/17 rear tires with no rubbing. the 275/40/17 tire is the same height as the stock 245/45/17 that comes with the car.