[Hunter5179]

I got that info off of a tire calculator. You punch in your stock setup then you punch in the tires you want to put on and it gives you the rolling diameter difference. Tire profiles usually do have to be adhusted fron and rear to achieve the best rolling diameter that's why the profile in front is 35 and the rear 30. I can't say if the dealer will agree but the rolling diameter difference is so small that if they did make a stink its only because they want to be dicks. It really wouldn't cause an issue with that setup either 245/35/20 front with a 275 or 285(slightly better)/30/20 rear.