Xoutpost member HUK posted pictures with 10" 214's on all fours. There are also pictures of a red X5 with 9" 20's. Run a search and you should find them. I went with four 10" 214's with Yokohama All-Season Parada Spec-X tires and it's a great setup. Doesn't look as aggressive from the back but you can't tell a difference from the side and you get incredible all-season performance. I'm adding flares because the front tire throws debris on the car. If you are not looking for an all season setup then I would go staggered but If you are then check out HUK's picts.