Tires / alignment questions

You could use 245's but I suggest you do not. I had 255's on a 9" wheel once, and they were stretched. The wheel lip stuck out so far, it looked awful and when I would park against curbs, I rubbed the right front wheel so many times. Now that I have the 275's back on there the lips are protected and if I rub a curb, nothing gets rashed up.

If your steering felt funny, it may be because the tires were worn unevenly..(if you bought them used)...or it could just simply be that wider wheels and tires do grab the road and pull your car all over the place.

I have a 99 Cobra and the stock wheels / tires were 245/45-17's. I put on some 245/40-18's on the front and 275/35-18's on the back, 18 x 9 wheels x 26mm offset, same width as the stock 04 Cobras. The front wheels are the same diameter and width as my 99 stock tires, but for some reason they rub when I'm backing up with the wheel fully turned. The steering feels funny in mine too. Had it aligned a couple times but it feels like it pulls hard to one side for a while, then hard to the other side...but if you've had 275's on your car and they didn't rub, maybe there's something wrong with mine. The other poster is right about 245's on 9 inch wheels, they do look a little narrow.