275 is the widest recommended by the tire manufacture for a 9" wheel. Wider than that and most tire manufactures won't grant any warranty claims. Also mounting a tire that is too wide for a particular wheel can make maintaining proper tire pressure difficult which will cause uneven tread ware and a shorter life for your tires.
As has been stated, the nitto drag radials run almost an inch narrower than the rest of the brands and do fit well on a 9" rim. On my 10.5" rim, they come just barely flush with the outer edge of the rim. I need to be careful as I don't have a whole lot of curb protection.
Here are some pics of the nitto 315's on 9 and 10.5 rims. (these are some big pics BTW so you should be able to tell the details)
Yea, I knew that the nitto's ran small. I had 275/40's on a 17x8 rim before and they looked as narrow as the 245/45's I had on the front. That's what I don't want. I'll probably end up going with the 315/35's. Thanks for all the input everyone, and Pure03, definitely thanks a bunch for the pics!
i've got 315 summitomo's on 9'' 03 cobra wheels. looks great and no problems. sticks out a little and looks alot better than the 275's did. i would recommend it to anyone. if you can swap your back tires to the front with no problems, your back tires are too damn small.