I am running 275/40/17 on the back and 245/45/17 on the front. My wheels are 17X8 so you should not have any problems.
255's will fit but youre not going to like it. i have 265's up front and as soon as they are worn out 275's are going back in their place!! the ole lady already curbed the shit out of one of the fronts, the tires dont protect the rim at all with the narrower tires. go with the 275's :thumb: