285's will fit like everyone has said with a little rub on aggressive turns, however you have to consider other things that will affect the car. with the bridgestones you will be riding on almost a 33 in. tire, so your speed will be considerably off (you can of course figure this out) if you were going 35 you might really be going 33 or 34 just depends on speed. but more importantly you will throw off your shifting. a transmission will go when it goes, but if you have a high mileage car riding tires up 4 sizes from stock this will definatley affect that process. i wouldnt say that you would get the tires and find you have shifting trouble in a few thousand miles, but over time you will probably hurt/ruin the tranny. GM has the options of recalibration of the rpm and speeds etc. but they list the tire options as : 245 (stock) and 265. so i dont know if they would calibrate a 285. So even though the tires look nice and may not rub bad you could have bigger troubles down the rode. P.S. if you ride 265 bridgestones like i do you still get almost a 32 in. tire but are on the safer side plus you save a couple of bucks.