I'm running 255's on the back of my VYSS, left hand side doesn't scrub, right hand side scrubs a little when people are in the back even with rolling the lip. I had 275s on but they lasted a day and scrubbed out real bad. From memory i think the factory wheels side in a fair way which should help you with not having scrubbing issues.
you would have to see whats written on the tyre though, it will say what width rim to fit it on.