Has there ever been another reason than estethics for staggered wheels? If it had to do with cornering I'd think you would want the wider wheel (i.e. the wheel where the sidewall v.s. width ratio is as low as possible thus giving an even firmer sidewall) on the front, not the back, since you're steering a lot more with the front wheels right? Also please don't say "wider tires have more contact patch and thus better grip" since it's just not true (see jerry33's post above).