18's are too heavy
18's are too big, your tire would be like painted on rubber
worst ride quality ever and chances are you'll bend your
wheels quite often
i have 235/17 front and 255/17 rear on stock suspension (i'm saving up for that lol)
and it was rubbing with 3 passengers in the back. perhaps my stock
springs are a bit tired, but there just isn't room for 275 back there unless u get
some crazy offset
oh yeah i forgot , 275 on a 9" wide wheel?!!? i've got 9.5" up front and my 235mm tire is
already a bit big on it...i haven't seen it done and i'd be surprised if u got it to work =]