8.5" rims are just right for the front. I run P275/60R15 tires and the 8.5" rims on all four corners with a rear 3" drop, and a front 2.5" drop(the tire size sounds big, but it's actually about the the same ride heigth as stock, so I don't have an incorrect MPH). Although, this depth on the rear doesn't look right to me, personally. On the rear, the 8.5" rim doesn't even out with the front, when you look at the fenderwell's outer edge. The front looks even with the fenderwell, but the rear lacks about 1.5" to reach the edge. I think a 10" rim on the rear would look better. If you decide to purchase 2 different sized rims, don't buy a directional rim if you plan on rotating tires front to rear. It wouldn't look right with wider tires in front.