You're better off with the square set up for winter. I have 19s - 255 all around. You're going to get a lot of responses that say you're fine with the staggered set and good snow tires but in my opinion, the rears are sleds. Your choice - looks or safety. I'd rather have smaller rears than have someone say how mean my wheels look while I'm wrapped around a pole.
Sitting back and waiting for the flaming from the youngins....
