I just got four new tires for my daily driver. While i was at the tire shop i started to look around and saw some tires for my grand prix. Now when i was there i saw some wide tires, i know the stock tire size for my grand prix is 225/55r17 and what i started wondering is if i could go wider and how wide i could go width wise with the stock rims. 235 or 245 would be the width i am looking for but not sure if i need to get new wheels or just get the tires and mount it on my stockies can anyone explain if this can be done or why not. thanks