I wouldn't recommend using a 255 series tire in front. The handling will be really screwy if you use tires that are almost as wide in front as in the rear. Furthermore, they will rub like a 40-year-old hooker with her pimp watching from the next room.
And I think you're right, that Bridgestone made a mistake on their spec sheet. I can't see how a 255/50-17 tire can be two inches smaller in outer diameter than a 205/50-17.
And I think you're right, that Bridgestone made a mistake on their spec sheet. I can't see how a 255/50-17 tire can be two inches smaller in outer diameter than a 205/50-17.